Hand-held body fat scale circuit

Abstract

The utility model discloses a hand-held body fat scale circuit, comprising a scale body and a handle, the scale body is provided with a scale body charging circuit, a male seat connector PL1, a scale body master control circuit and a scale body voltage stabilizing circuit, the scale body is provided with a handle accommodating groove for placing the handle, and a magnet is arranged in the scale body close to the side surface of the handle accommodating groove. The handle is provided with a female seat connector PL2 connected with the male seat connector PL1 in an inserted mode, a handle charging circuit connected with the female seat connector PL2, a Hall sensor circuit, a fat measuring electrode circuit and a handle main control circuit used for calculating body fat information according to detection information of the fat measuring electrode circuit and entering a standby state when the Hall sensor circuit detects a magnet. Wires do not need to be arranged, using and moving are convenient, meanwhile, a dry battery does not need to be replaced to maintain the electric quantity of the handle, charging is achieved through inserting connection of the connecting base, and the charging efficiency is greatly improved.

Description

[Technical Field]

[0001] This utility model relates to a handheld body fat scale circuit. [Background Technology]

[0002] Currently, there are more and more professional products for measuring weight and body composition data. They are generally equipped with a scale body and a handle. When measuring body fat, both the scale body and the handle are usually required to measure body fat. Without either one, body fat measurement cannot be performed, which is inconvenient to use.

[0003] Meanwhile, the scale body and the handle are generally connected by a power cord to achieve the power connection and detection signal transmission between the scale body and the handle. However, setting up a power connection makes it inconvenient for users to pick up and move the handle, and the power cord is easily pulled and broken during use, causing damage. Some scale bodies and handles are connected wirelessly, but dry batteries need to be installed in the handle and need to be replaced regularly to maintain sufficient power for the handle. In addition, even when the handle is stationary after use, it still needs to work for a period of time before entering standby mode, resulting in high energy consumption. [Utility Model Content]

[0004] This invention overcomes the shortcomings of the prior art and provides a handheld body fat scale circuit.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A handheld body fat scale circuit, characterized in that it includes a scale body and a handle. The scale body is provided with a scale charging circuit connected to an adapter for charging the scale body battery BAT1, a male connector PL1 connected to the scale body charging circuit for charging the handle, a scale body main control circuit for controlling the male connector PL1 to charge the handle, and a scale body voltage regulator circuit connected to the scale body battery BAT1 for regulating the power supply to the scale body main control circuit. The scale body is provided with a handle storage slot for placing the handle, and a magnet is provided on the side of the scale body near the handle storage slot. The handle is provided with... The system includes a female connector PL2 that plugs into the male connector PL1; a handle charging circuit that connects to the female connector PL2 to charge the handle battery BAT2; a Hall sensor circuit that detects whether the handle is inserted into the handle storage slot near a magnet; a body fat measurement electrode circuit for handheld body fat measurement; a handle main control circuit that calculates body fat information based on the information detected by the body fat measurement electrode circuit and enters standby mode when the Hall sensor circuit detects a magnet; and a handle voltage regulator circuit that connects to the handle battery BAT2 to regulate the voltage and supply power to the handle main control circuit and the Hall sensor circuit.

[0007] The handheld body fat scale circuit described above is characterized in that: the scale body is provided with a scale body bidirectional broadcast Bluetooth circuit connected to the scale body main control circuit, the handle is provided with a handle bidirectional broadcast Bluetooth circuit connected to the handle main control circuit for wireless communication with the scale body bidirectional broadcast Bluetooth circuit, the scale body voltage regulator circuit supplies power to the scale body bidirectional broadcast Bluetooth circuit, and the handle voltage regulator circuit supplies power to the handle bidirectional broadcast Bluetooth circuit.

[0008] The handheld body fat scale circuit described above is characterized in that: the scale body is provided with a weighing sensor circuit for weighing, a display circuit for displaying weighing data and body fat data, and a buzzer circuit for voice prompts, which are respectively connected to the main control circuit of the scale body; and the scale body voltage regulator circuit supplies power to the buzzer circuit.

[0009] The handheld body fat scale circuit described above is characterized in that: the handle is provided with a Bluetooth master control circuit for wireless communication connection with smart devices, and a power indicator circuit for indicating the charging status of the handle battery BAT2, and the handle voltage regulator circuit supplies power to the Bluetooth master control circuit and the power indicator circuit respectively.

[0010] The handheld body fat scale circuit described above is characterized by: a charging chip U1, pin 1 of which is connected to the main control circuit of the scale; pin 2 of which is grounded; pin 4 of which is connected to one end of resistor R3, one end of resistor R1, the positive terminal of diode D01, one end of capacitor C2, one end of capacitor C1, and pin 1 of adapter connection terminal PW; the other end of resistor R3 is connected to one end of resistor R4 and the gate of MOSFET Q1; the other end of resistor R1 is connected to one end of resistor R2, one end of capacitor C3, and the main control circuit of the scale; and pin 2 of adapter connection terminal PW and pin 2 of capacitor C1 are connected to the main control circuit of the scale. One end of capacitor C2, the other end of capacitor C3, the other end of resistor R2, and the other end of resistor R4 are grounded respectively. Pin 3 of charging chip U1 is connected to the positive terminal of scale battery BAT1, one end of capacitor C4, one end of capacitor C5, one end of resistor R6, and the drain terminal of MOSFET Q1 respectively. Pin 5 of charging chip U1 is connected to one end of resistor R5. The other end of resistor R5, the negative terminal of scale battery BAT1, the other end of capacitor C4, and the other end of capacitor C5 are grounded respectively. The negative terminal of diode DO1 is connected to the source terminal of MOSFET Q1 and the other end of resistor R6 respectively. The output power VDD of the negative terminal of diode DO1 is connected to the scale voltage regulator circuit.

[0011] The scale body voltage regulation circuit includes a voltage regulator chip U2. The Vi terminal of the voltage regulator chip U2 is connected to one end of resistor R7, one end of capacitor C7, one end of capacitor C6, and the negative terminal of diode DO1. The GE terminals of the voltage regulator chip U2 are connected to the other end of resistor R7 and the collector of transistor Q2. The base of transistor Q2 is connected to one end of capacitor C10 and one end of resistor R9 through resistor R8. The emitter of transistor Q2 and the other end of resistor R9 are grounded. The other end of capacitor C10 is connected to pin 1 of the adapter connection terminal PW. The Vo terminal of the voltage regulator chip U2 is connected to one end of capacitor C8 and one end of capacitor C9. The other ends of capacitor C6, capacitor C7, the G terminal of the voltage regulator chip U2, the other end of capacitor C8, and the other end of capacitor C9 are grounded. The power supply VCC output from the Vo terminal of the voltage regulator chip U2 supplies power to the scale body main control circuit, the scale body two-way broadcast Bluetooth circuit, and the buzzer circuit.

[0012] The handheld body fat scale circuit described above is characterized by the following: the main control circuit of the scale body includes a main control chip U3; pin 5 of the main control chip U3 is connected to the scale body voltage regulator circuit and one end of capacitor C11, with the other end of capacitor C11 grounded; pin 6 of the main control chip U3 is grounded through capacitor C12; pin 7 of the main control chip U3 is connected to the scale body voltage regulator circuit and one end of capacitor C13, with the other end of capacitor C13 grounded; pin 8 of the main control chip U3 is connected to one end of capacitor C14 and one end of resistor R15, with the other end of capacitor C14 grounded; the other end of resistor R15 is connected to the weighing sensor circuit; pin 9 of the main control chip U3 is connected to one end of capacitor C15, one end of capacitor C16, one end of capacitor C17, and one end of resistor R16, with the other end of capacitor C17 grounded; the other end of resistor R16 is connected to the weighing sensor circuit; pin 10 of the main control chip U3 is connected to the other end of capacitor C15 and capacitor C16... One end of the main control chip U3 is connected to one end of capacitor C18 and one end of resistor R17. The other end of capacitor C18 is grounded. The other end of resistor R17 is connected to the weighing sensor circuit. Pin 11 of the main control chip U3 is connected to one end of resistor R13 and one end of resistor R14. The other end of resistor R13 is connected to the positive terminal of the scale battery BAT1. The other end of resistor R14 is grounded. Pin 13 of the main control chip U3 is grounded through the switch button UNIT. Pins 14-15 of the main control chip U3 are connected to the scale charging circuit. Pin 16 of the main control chip U3 is connected to one end of resistor R26 and male connector PL1. The other end of resistor R26 is grounded. Pins 17-19 and pins 21-22 of the main control chip U3 are connected to the scale's two-way broadcast Bluetooth circuit. Pin 20 of the main control chip U3 is connected to the buzzer circuit. Pins 25-32 of the main control chip U3 are connected to the display circuit. Pin 33 of the main control chip U3 is grounded.

[0013] The handheld body fat scale circuit described above is characterized by: a two-way Bluetooth broadcast circuit for the scale body including a storage chip U6 and a Bluetooth broadcast chip U5; pins 1-4 and pin 7 of the storage chip U6 are grounded; pin 5 of the storage chip U6 is connected to the scale body main control circuit and one end of resistor R24; the other end of resistor R24 ​​is connected to the scale body voltage regulator circuit; pin 6 of the storage chip U6 is connected to the scale body main control circuit and one end of resistor R23; the other end of resistor R23 is connected to the scale body voltage regulator circuit; pin 8 of the storage chip U6 is connected to the scale body voltage regulator circuit; one end of capacitor C28 is connected to the scale body voltage regulator circuit; the other end of capacitor C28 is grounded; pin 1 of the Bluetooth broadcast chip U5 is connected to the scale body main control circuit through resistor R25; pin 2 of the Bluetooth broadcast chip U5 is connected to the scale body main control circuit through resistor R20; pin 3 of the Bluetooth broadcast chip U5... Through resistor R21 and the main control circuit of the scale, pin 4 of Bluetooth broadcast chip U5 is connected to one end of capacitor C22, one end of capacitor C21, and the voltage regulator circuit of the scale. The other ends of capacitor C22 and C21 are grounded. Pin 5 of Bluetooth broadcast chip U5 is connected to pin 1 of crystal oscillator Y1 and one end of capacitor C26. Pin 6 of Bluetooth broadcast chip U5 is connected to pin 3 of crystal oscillator Y1 and one end of capacitor C27. The other ends of capacitor C26, C27, and pins 2 and 4 of crystal oscillator Y1 are grounded. Pin 7 of Bluetooth broadcast chip U5 is grounded. Pin 8 of Bluetooth broadcast chip U5 is connected through capacitor C23 to one end of resistor R22 and one end of capacitor C24. The other end of resistor R22 is connected to antenna A1 and one end of capacitor C25. The other ends of capacitor C24 are grounded.

[0014] The handheld body fat scale circuit described above is characterized by: a charging chip U101 in the handle charging circuit; pin 1 of the charging chip U101 is connected to the main control circuit of the handle; pin 2 of the charging chip U101 is grounded; pin 4 of the charging chip U101 is connected to one end of resistor R301, one end of resistor R101, the positive terminal of diode DO101, one end of capacitor C201, one end of capacitor C101, and pin 1 of the female connector PL2; the other end of resistor R301 is connected to one end of resistor R401 and the gate of MOSFET Q101; the other end of resistor R101 is connected to one end of resistor R201, one end of capacitor C301, and the main control circuit of the handle; pin 2 of the female connector PL2 and the other end of capacitor C101 are connected... The other ends of capacitor C201, capacitor C301, resistor R201, and resistor R401 are grounded respectively. Pin 3 of charging chip U101 is connected to the positive terminal of controller battery BAT2, one end of capacitor C401, one end of capacitor C501, one end of resistor R601, and the drain terminal of MOSFET Q101 respectively. Pin 5 of charging chip U101 is connected to one end of resistor R501. The other end of resistor R501, the negative terminal of controller battery BAT2, the other end of capacitor C401, and the other end of capacitor C501 are grounded respectively. The negative terminal of diode DO101 is connected to the source terminal of MOSFET Q101 and the other end of resistor R601 respectively. The output power VDD of the negative terminal of diode DO101 is connected to the controller voltage regulator circuit.

[0015] The handle's voltage regulator circuit includes a voltage regulator chip U201. The Vi terminal of the voltage regulator chip U201 is connected to one end of resistor R701, one end of capacitor C701, one end of capacitor C601, and the negative terminal of diode DO101. The GE terminals of the voltage regulator chip U201 are connected to the other end of resistor R701 and the collector of transistor Q201. The base of transistor Q201 is connected to one end of capacitor C1001 and one end of resistor R901 through resistor R801. The emitter of transistor Q201 and the other end of resistor R901 are respectively... The capacitor C1001 is grounded, and the other end of the capacitor is connected to pin 1 of the PL2 connector. The Vo terminal of the voltage regulator chip U201 is connected to one end of capacitor C801 and one end of capacitor C901. The other ends of capacitors C601, C701, U201, C801, and C901 are grounded. The VCC output from the Vo terminal of the voltage regulator chip U201 supplies power to the main control circuit of the controller, the two-way broadcast Bluetooth circuit of the controller, the Bluetooth main control circuit, and the power indicator circuit.

[0016] The handheld body fat scale circuit described above is characterized by the following: the main control circuit of the handle includes a main control chip U301. Pin 1 of the main control chip U301 is grounded. Pin 2 of the main control chip U301 is connected to one end of resistor R1201 and one end of resistor R1301, respectively. Resistor R1201 is connected to the handle charging circuit, and the other end of resistor R1301 is grounded. Pin 3 of the main control chip U301 is connected to one end of resistor R2201, one end of capacitor C1101, and the handle voltage regulator circuit, respectively. The other end of resistor R1101 is connected to pin 4 of the main control chip U301 and one end of capacitor C1201, respectively. The other ends of capacitors C1101 and C1201 are grounded. Pins 6 and 9 of the main control chip U301 are grounded. Pin 10 of the main control chip U301 is connected to pin 11 of the main control chip U301 through capacitor C1301. Pins 12-15 of the main control chip U301 are connected to the body fat measurement electrode circuit, respectively. Pin 16 of the main control chip U301 is connected to one end of resistor R1501, pin 18 of the main control chip U301, and one end of resistor R1601 through resistor R1401. Resistor R1501 is connected to pin 17 of the main control chip U301. The other end of resistor R1601 is connected to pin 19 of the main control chip U301 through capacitor C1401. Pin 20 of the main control chip U301 is grounded through capacitor C1501. Pin 23 of the main control chip U301 is connected to one end of resistor R3101 and the Hall sensor circuit through resistor R3001. The other end of resistor R3101 is connected to the female connector PL2. Pin 24 of the main control chip U301 is connected to the controller voltage regulator circuit. Pins 25-28 of the main control chip U301 are connected to the Bluetooth main control circuit. Pins 31-32 of the main control chip U301 are connected to the controller charging circuit. Pins 33-34 of the main control chip U301 are connected to the power indicator circuit.

[0017] The handheld body fat scale circuit described above is characterized by: a two-way Bluetooth broadcast circuit for the handle including a Bluetooth broadcast chip U501; pin 1 of the Bluetooth broadcast chip U501 is connected to the Bluetooth main control circuit via resistor R3401; pin 2 of the Bluetooth broadcast chip U501 is connected to the Bluetooth main control circuit via resistor R2301; pin 3 of the Bluetooth broadcast chip U501 is connected to the Bluetooth main control circuit via resistor R2401; pin 4 of the Bluetooth broadcast chip U501 is connected to one end of capacitor C2201, one end of capacitor C2101, and the handle voltage regulator circuit respectively; the other ends of capacitors C2201 and C2101 are grounded respectively; pin 5 of the Bluetooth broadcast chip U501... Pin 1 of crystal oscillator Y101 and one end of capacitor 2601 are connected to each other. Pin 6 of Bluetooth broadcast chip U501 is connected to pin 3 of crystal oscillator Y101 and one end of capacitor 2701. The other end of capacitor 2601, the other end of capacitor 2701, pin 2 of crystal oscillator Y101, and pin 4 of crystal oscillator Y101 are grounded. Pin 7 of Bluetooth broadcast chip U501 is grounded. Pin 8 of Bluetooth broadcast chip U501 is connected to one end of resistor R2201 and one end of capacitor C2401 through capacitor C2301. The other end of resistor R2201 is connected to antenna A101 and one end of capacitor C2501. The other ends of capacitor C2401 and the other end of capacitor C2501 are grounded.

[0018] The Bluetooth main control circuit includes Bluetooth communication M1. Bluetooth communication M1 pin 9 is grounded. Bluetooth communication M1 pin 10 is connected to the gamepad main control circuit through resistor R2701. Bluetooth communication M1 pin 11 is connected to the gamepad main control circuit through resistor R2801. Bluetooth communication M1 pin 12 is connected to the gamepad main control circuit through resistor R2901. Bluetooth communication M1 pin 13 is connected to one end of capacitor C1901, one end of capacitor C1801, one end of resistor R2601, and the collector of transistor Q501. The other ends of capacitors C1901 and C1801 are grounded. The base of transistor Q501 is connected to the gamepad main control circuit through resistor R2501. The other end of resistor R2601 and the emitter of transistor Q501 are connected to the gamepad voltage regulator circuit. Bluetooth communication M1 pins 16-18 are connected to the gamepad bidirectional broadcast Bluetooth circuit. Bluetooth communication M1 pin 19 is grounded.

[0019] The beneficial effects of this utility model are:

[0020] This invention features a wireless communication connection between the scale body and the handle, and each component is equipped with a rechargeable battery. The scale body charges the handle via a male connector PL1 and a female connector PL2, eliminating the need for power cords, making it convenient to use and move. It also eliminates the need to replace dry-cell batteries to maintain the handle's power, and the plug-in charging connection significantly improves charging efficiency. When the handle is inserted into the scale body's handle storage slot, the Hall sensor circuit detects a magnet, putting the handle into standby mode, reducing energy consumption. Furthermore, this invention includes a body fat measurement electrode circuit on the handle, allowing users to measure body fat simply by holding the handle, without needing to use it with the scale body. This makes it easy to handle, move, and carry for independent body fat measurement. [Image Description]

[0021] Figure 1 This is a schematic diagram of the present invention;

[0022] Figure 2 This is a circuit diagram of the charging circuit for the scale body of this utility model;

[0023] Figure 3 This is the circuit diagram of the male connector PL1 of this utility model;

[0024] Figure 4 This is the main control circuit diagram of the scale body of this utility model;

[0025] Figure 5 This is the voltage stabilizing circuit diagram for the scale body of this utility model;

[0026] Figure 6 This is a diagram showing the current of the two-way Bluetooth broadcasting system on the scale body of this utility model.

[0027] Figure 7 This is the circuit diagram of the lipid measurement electrode of this utility model;

[0028] Figure 8 This is the display circuit diagram of this utility model;

[0029] Figure 9 This is the circuit diagram of the buzzer of this utility model;

[0030] Figure 10 This is a circuit diagram of the female connector PL2 and the handle charging circuit of this utility model;

[0031] Figure 11 This is the circuit diagram of the Hall sensor of this utility model;

[0032] Figure 12 This is the circuit diagram of the lipid measurement electrode of this utility model;

[0033] Figure 13 This is the main control circuit diagram of the handle of this utility model;

[0034] Figure 14This is the voltage regulator circuit diagram for the handle of this utility model;

[0035] Figure 15 This is a circuit diagram of the two-way broadcast Bluetooth circuit for the handle of this utility model;

[0036] Figure 16 This is the Bluetooth main control circuit diagram of this utility model;

[0037] Figure 17 This is the circuit diagram for the power indicator light of this utility model. [Detailed Implementation]

[0038] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0039] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "preferred," "second-best," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "preferred" or "second-best" may explicitly or implicitly include at least one of those features.

[0040] like Figure 1-17 As shown, a handheld body fat scale circuit includes a scale body and a handle. The scale body has a scale charging circuit 1 connected to an adapter for charging the scale body battery BAT1, a male connector PL1 connected to the scale charging circuit 1 for charging the handle, a scale main control circuit 2 for controlling the male connector PL1 to charge the handle, and a scale voltage regulator circuit 3 connected to the scale battery BAT1 for regulating the power supply to the scale main control circuit 2. The scale body has a handle storage slot for placing the handle, and a magnet is located on the side of the scale body near the handle storage slot. The handle has a connection to the male connector. The system includes: a female connector PL2 connected to connector PL1; a handle charging circuit 4 connected to connector PL2 for charging the handle battery BAT2; a Hall sensor circuit 5 for detecting whether the handle is inserted into the handle storage slot near a magnet; a body fat measuring electrode circuit 6 for handheld body fat measurement; a handle main control circuit 7 for calculating body fat information based on the information detected by the body fat measuring electrode circuit 6 and entering standby mode when the Hall sensor circuit 5 detects a magnet; and a handle voltage regulator circuit 8 connected to the handle battery BAT2 for stabilizing the power supply to the handle main control circuit 7 and the Hall sensor circuit 5.

[0041] During body fat measurement, the user simply removes the handle from the handle storage slot on the scale and places both hands on the body fat measurement electrode circuit 6. The body fat measurement electrode circuit 6 detects the user's body electrical signals, and the body fat information is calculated by the handle's main control circuit 7. During handle use, the handle battery BAT2 supplies power to the various circuits of the handle after being regulated by the handle voltage regulator circuit 8; during scale use, the scale battery BAT1 supplies power to the various circuits of the scale after being regulated by the scale voltage regulator circuit 3.

[0042] During charging, the handle is inserted into the handle storage slot on the scale body, and the male connector PL1 is connected to the female connector PL2. The adapter is then plugged into the scale body charging circuit 1, which charges the scale body battery BAT1. Simultaneously, the male connector PL1 supplies power to the female connector PL2, and the handle charges the handle battery BAT2 through the handle charging circuit 4. The handle storage slot ensures a tight connection between the male connector PL1 on the scale body and the female connector PL2 on the handle. Furthermore, after the handle is inserted into the storage slot, when the Hall sensor circuit 5 detects a magnet, the handle main control circuit 7 enters standby mode, saving energy.

[0043] like Figure 1 As shown, the scale body is equipped with a two-way broadcast Bluetooth circuit 9 connected to the scale body main control circuit 2, and the handle is equipped with a two-way broadcast Bluetooth circuit 10 connected to the handle main control circuit 7 for wireless communication with the scale body two-way broadcast Bluetooth circuit 9. The scale body voltage regulator circuit 3 supplies power to the scale body two-way broadcast Bluetooth circuit 9, and the handle voltage regulator circuit 8 supplies power to the handle two-way broadcast Bluetooth circuit 10. During use, the scale body two-way broadcast Bluetooth circuit 9 and the handle two-way broadcast Bluetooth circuit 10 are wirelessly connected. Specifically, after the handle is removed from the handle storage slot, the Hall sensor circuit 5 detects a change in the Hall switch signal level, which powers on the scale body and the handle, and activates the scale body two-way broadcast Bluetooth circuit 9 and the handle two-way broadcast Bluetooth circuit 10 to pair the signal connection ports of the scale body and the handle, and activates the two Bluetooth connections after pairing is completed. During the Bluetooth connection process of the handle, the green indicator light flashes rapidly. When the Bluetooth connection is successful, the green indicator light on the handle stays on, and the Bluetooth icon on the scale body stays on.

[0044] like Figure 1As shown, the scale body is equipped with a weighing sensor circuit 11 connected to the main control circuit 2 for weighing, a display circuit 12 for displaying weighing data and body fat data, and a buzzer circuit 13 for voice prompts. The scale body voltage regulator circuit 3 supplies power to the buzzer circuit 13. In actual use, the user's weight is measured through the weighing sensor circuit 11. The scale body uses a pressure-activated method in standby mode. When the weight on the scale surface exceeds the program-set threshold, the weighing function is automatically activated. At the same time, the scale body's two-way broadcast Bluetooth circuit 9 is turned on, and the display circuit 12 displays that the weighing has returned to zero before starting weight measurement. Simultaneously, the buzzer circuit 13 provides an audible prompt if the handle is not reinstalled in the handle storage slot after use.

[0045] like Figure 1 As shown, the handle is equipped with a Bluetooth main control circuit 14 for wireless communication with smart devices and a power indicator circuit 15 for indicating the charging status of the handle battery BAT2. The handle voltage regulator circuit 8 supplies power to the Bluetooth main control circuit 14 and the power indicator circuit 15. In actual use, the Bluetooth main control circuit 14 connects to smart devices such as mobile phones to receive weighing information from the scale and body fat measurement information from the handle. During body fat measurement, the user steps on the scale and holds the four electrode pads on the handle to begin measurement. The scale displays a body fat measurement symbol, and the green indicator light on the handle remains on. After the test is completed, the scale displays information such as weight, body fat, water content, and heart rate in a cycle. The user's various body composition data interact with the mobile APP through the Bluetooth main control circuit 14 and are displayed on the mobile APP. The power indicator circuit 15 emits different colored lights to indicate the charging status of the handle battery BAT2. When charging the scale and handle with a TYPE-C charger, the battery symbol on the LED display of the scale flashes during charging and remains on when fully charged; the red indicator light on the handle flashes rapidly during charging and remains on when fully charged.

[0046] like Figure 2As shown, the connection structure of the scale charging circuit 1 includes a charging chip U1. Pin 1 of the charging chip U1 is connected to the scale main control circuit 2, pin 2 of the charging chip U1 is grounded, and pin 4 of the charging chip U1 is connected to one end of resistor R3, one end of resistor R1, the positive terminal of diode DO1, one end of capacitor C2, one end of capacitor C1, and pin 1 of the adapter connection terminal PW. The other end of resistor R3 is connected to one end of resistor R4 and the gate of MOSFET Q1. The other end of resistor R1 is connected to one end of resistor R2, one end of capacitor C3, and the scale main control circuit 2. Pin 2 of the adapter connection terminal PW, the other end of capacitor C1, and capacitor C 2. The other end of the capacitor C3, the other end of the resistor R2, and the other end of the resistor R4 are grounded respectively. Pin 3 of the charging chip U1 is connected to the positive terminal of the scale battery BAT1, one end of the capacitor C4, one end of the capacitor C5, one end of the resistor R6, and the drain terminal of the MOSFET Q1 respectively. Pin 5 of the charging chip U1 is connected to one end of the resistor R5. The other end of the resistor R5, the negative terminal of the scale battery BAT1, the other end of the capacitor C4, and the other end of the capacitor C5 are grounded respectively. The negative terminal of the diode DO1 is connected to the source terminal of the MOSFET Q1 and the other end of the resistor R6 respectively. The output power VDD of the negative terminal of the diode DO1 is connected to the scale voltage regulator circuit 3.

[0047] like Figure 5 As shown, the connection structure of the scale body voltage regulator circuit 3 includes a voltage regulator chip U2. The Vi terminal of the voltage regulator chip U2 is connected to one end of resistor R7, one end of capacitor C7, one end of capacitor C6, and the negative terminal of diode DO1. The GE terminals of the voltage regulator chip U2 are connected to the other end of resistor R7 and the collector of transistor Q2. The base of transistor Q2 is connected to one end of capacitor C10 and one end of resistor R9 through resistor R8. The emitter of transistor Q2 and the other end of resistor R9 are grounded. The other end of capacitor C10 is connected to the adapter connection terminal PW pin 1. The Vo terminal of the voltage regulator chip U2 is connected to one end of capacitor C8 and one end of capacitor C9. The other ends of capacitor C6, capacitor C7, the G terminal of the voltage regulator chip U2, the other end of capacitor C8, and the other end of capacitor C9 are grounded. The power supply VCC output from the Vo terminal of the voltage regulator chip U2 supplies power to the scale body main control circuit 2, the scale body two-way broadcast Bluetooth circuit 9, and the buzzer circuit 13.

[0048] like Figure 4As shown, the connection structure of the main control circuit 2 of the scale body includes a main control chip U3. Pin 5 of the main control chip U3 is connected to the scale body voltage regulator circuit 3 and one end of capacitor C11, with the other end of capacitor C11 grounded. Pin 6 of the main control chip U3 is grounded through capacitor C12. Pin 7 of the main control chip U3 is connected to the scale body voltage regulator circuit 3 and one end of capacitor C13, with the other end of capacitor C13 grounded. Pin 8 of the main control chip U3 is connected to one end of capacitor C14 and one end of resistor R15, with the other end of capacitor C14 grounded. The other end of resistor R15 is connected to the weighing sensor circuit 11. Pin 9 of the main control chip U3 is connected to one end of capacitor C15, one end of capacitor C16, one end of capacitor C17, and one end of resistor R16, with the other end of capacitor C17 grounded. The other end of resistor R16 is connected to the weighing sensor circuit 11. Pin 10 of the main control chip U3 is connected to the other end of capacitor C15, one end of capacitor C16, and one end of capacitor C17. One end of capacitor C18 and one end of resistor R17 are connected, the other end of capacitor C18 is grounded, the other end of resistor R17 is connected to the weighing sensor circuit 11, pin 11 of the main control chip U3 is connected to one end of resistor R13 and one end of resistor R14 respectively, the other end of resistor R13 is connected to the positive terminal of the scale battery BAT1, the other end of resistor R14 is grounded, pin 13 of the main control chip U3 is grounded through the switch button UNIT, pins 14-15 of the main control chip U3 are connected to the scale charging circuit 1 respectively, pin 16 of the main control chip U3 is connected to one end of resistor R26 and male connector PL1 respectively, the other end of resistor R26 is grounded, pins 17-19 and pins 21-22 of the main control chip U3 are connected to the scale bidirectional broadcast Bluetooth circuit 9 respectively, pin 20 of the main control chip U3 is connected to the buzzer circuit 13, pins 25-32 of the main control chip U3 are connected to the display circuit 12 respectively, and pin 33 of the main control chip U3 is grounded.

[0049] like Figure 6As shown, the connection structure of the two-way broadcast Bluetooth circuit 9 of the scale body includes a memory chip U6 and a Bluetooth broadcast chip U5. Pins 1-4 and pin 7 of the memory chip U6 are grounded. Pin 5 of the memory chip U6 is connected to the main control circuit 2 of the scale body and one end of resistor R24. The other end of resistor R24 ​​is connected to the voltage regulator circuit 3 of the scale body. Pin 6 of the memory chip U6 is connected to the main control circuit 2 of the scale body and one end of resistor R23. The other end of resistor R23 is connected to the voltage regulator circuit 3 of the scale body. Pin 8 of the memory chip U6 is connected to the voltage regulator circuit 3 of the scale body. One end of capacitor C28 is connected to the voltage regulator circuit 3 of the scale body, and the other end of capacitor C28 is grounded. Pin 1 of the Bluetooth broadcast chip U5 is connected to the main control circuit 2 of the scale body through resistor R25. Pin 2 of the Bluetooth broadcast chip U5 is connected to the main control circuit 2 of the scale body through resistor R20. Pin 3 of the Bluetooth broadcast chip U5 is connected to the main control circuit 2 of the scale body through resistor R25. Resistor R21 is connected to the main control circuit 2 of the scale body. Pin 4 of Bluetooth broadcast chip U5 is connected to one end of capacitor C22, one end of capacitor C21, and the scale body voltage regulator circuit 3, respectively. The other ends of capacitor C22 and C21 are grounded. Pin 5 of Bluetooth broadcast chip U5 is connected to pin 1 of crystal oscillator Y1 and one end of capacitor C26, respectively. Pin 6 of Bluetooth broadcast chip U5 is connected to pin 3 of crystal oscillator Y1 and one end of capacitor C27, respectively. The other ends of capacitor C26, C27, and pins 2 and 4 of crystal oscillator Y1 are grounded, respectively. Pin 7 of Bluetooth broadcast chip U5 is grounded. Pin 8 of Bluetooth broadcast chip U5 is connected to one end of resistor R22 and one end of capacitor C24 through capacitor C23, respectively. The other end of resistor R22 is connected to antenna A1 and one end of capacitor C25, respectively. The other ends of capacitor C24 are grounded, respectively.

[0050] like Figure 10As shown, the connection structure of the controller charging circuit 4 includes a charging chip U101. Pin 1 of the charging chip U101 is connected to the controller main control circuit 7. Pin 2 of the charging chip U101 is grounded. Pin 4 of the charging chip U101 is connected to one end of resistor R301, one end of resistor R101, the positive terminal of diode DO101, one end of capacitor C201, one end of capacitor C101, and pin 1 of the female connector PL2. The other end of resistor R301 is connected to one end of resistor R401 and the gate of MOSFET Q101. The other end of resistor R101 is connected to one end of resistor R201, one end of capacitor C301, and the controller main control circuit 7. Pin 2 of the female connector PL2, the other end of capacitor C101, and capacitor C201 are also connected. The other end of the capacitor, the other end of the resistor, the other end of the resistor, and the other end of the resistor are respectively grounded. Pin 3 of the charging chip U101 is connected to the positive terminal of the controller battery BAT2, one end of the capacitor C401, one end of the capacitor C501, one end of the resistor R601, and the drain terminal of the MOSFET Q101. Pin 5 of the charging chip U101 is connected to one end of the resistor R501. The other end of the resistor R501, the negative terminal of the controller battery BAT2, the other end of the capacitor C401, and the other end of the capacitor C501 are respectively grounded. The negative terminal of the diode DO101 is connected to the source terminal of the MOSFET Q101 and the other end of the resistor R601. The output power VDD of the negative terminal of the diode DO101 is connected to the controller voltage regulator circuit 8.

[0051] like Figure 14 As shown, the connection structure of the handle voltage regulator circuit 8 includes a voltage regulator chip U201. The Vi terminal of the voltage regulator chip U201 is connected to one end of resistor R701, one end of capacitor C701, one end of capacitor C601, and the negative terminal of diode DO101. The GE terminals of the voltage regulator chip U201 are connected to the other end of resistor R701 and the collector of transistor Q201. The base of transistor Q201 is connected to one end of capacitor C1001 and one end of resistor R901 through resistor R801. The emitter of transistor Q201 and the other end of resistor R901 are connected to... Do not ground. Connect the other end of capacitor C1001 to pin 1 of PL2 of the female connector. Connect the Vo terminal of voltage regulator chip U201 to one end of capacitor C801 and one end of capacitor C901 respectively. The other ends of capacitor C601, C701, G terminal of voltage regulator chip U201, C801, and C901 are grounded respectively. The power supply VCC output by the Vo terminal of voltage regulator chip U201 supplies power to the main control circuit 7 of the controller, the two-way broadcast Bluetooth circuit 10 of the controller, the Bluetooth main control circuit 14, and the power indicator circuit 15 respectively.

[0052] like Figure 13As shown, the connection structure of the main control circuit 7 of the handle includes a main control chip U301. Pin 1 of the main control chip U301 is grounded. Pin 2 of the main control chip U301 is connected to one end of resistor R1201 and one end of resistor R1301 respectively. Resistor R1201 is connected to the handle charging circuit 4. The other end of resistor R1301 is grounded. Pin 3 of the main control chip U301 is connected to one end of resistor R2201, one end of capacitor C1101, and the handle voltage regulator circuit 8 respectively. The other end of resistor R1101 is connected to pin 4 of the main control chip U301 and one end of capacitor C1201 respectively. The other ends of capacitor C1101 and capacitor C1201 are grounded respectively. Pins 6 and 9 of the main control chip U301 are grounded respectively. Pin 10 of the main control chip U301 is connected to pin 11 of the main control chip U301 through capacitor C1301. Pins 12-15 of the main control chip U301 are connected to the lipid measurement electrode circuit 6 respectively. Pin 16 is connected to one end of resistor R1501, pin 18 of main control chip U301, and one end of resistor R1601 via resistor R1401. Resistor R1501 is connected to pin 17 of main control chip U301. The other end of resistor R1601 is connected to pin 19 of main control chip U301 via capacitor C1401. Pin 20 of main control chip U301 is grounded via capacitor C1501. Pin 23 of main control chip U301 is connected to one end of resistor R3101 and Hall sensor circuit 5 via resistor R3001. The other end of resistor R3101 is connected to female connector PL2. Pin 24 of main control chip U301 is connected to controller voltage regulator circuit 8. Pins 25-28 of main control chip U301 are connected to Bluetooth main control circuit 14. Pins 31-32 of main control chip U301 are connected to controller charging circuit 4. Pins 33-34 of main control chip U301 are connected to power indicator circuit 15.

[0053] like Figure 15As shown, the connection structure of the two-way broadcast Bluetooth circuit 10 of the controller includes a Bluetooth broadcast chip U501. Pin 1 of the Bluetooth broadcast chip U501 is connected to the Bluetooth main control circuit 14 through resistor R3401. Pin 2 of the Bluetooth broadcast chip U501 is connected to the Bluetooth main control circuit 14 through resistor R2301. Pin 3 of the Bluetooth broadcast chip U501 is connected to the Bluetooth main control circuit 14 through resistor R2401. Pin 4 of the Bluetooth broadcast chip U501 is connected to one end of capacitor C2201, one end of capacitor C2101, and the controller voltage regulator circuit 8, respectively. The other ends of capacitors C2201 and C2101 are grounded, respectively. Pin 5 of the Bluetooth broadcast chip U501 is connected to... Connect pin 1 of crystal oscillator Y101 and one end of capacitor 2601. Connect pin 6 of Bluetooth broadcast chip U501 to pin 3 of crystal oscillator Y101 and one end of capacitor 2701. The other end of capacitor 2601, the other end of capacitor 2701, pin 2 of crystal oscillator Y101, and pin 4 of crystal oscillator Y101 are grounded. Pin 7 of Bluetooth broadcast chip U501 is grounded. Pin 8 of Bluetooth broadcast chip U501 is connected to one end of resistor R2201 and one end of capacitor C2401 through capacitor C2301. The other end of resistor R2201 is connected to antenna A101 and one end of capacitor C2501. The other ends of capacitor C2401 and the other end of capacitor C2501 are grounded.

[0054] like Figure 16 As shown, the connection structure of the Bluetooth main control circuit 14 includes Bluetooth communication M1. Bluetooth communication M1 pin 9 is grounded. Bluetooth communication M1 pin 10 is connected to the controller main control circuit 7 through resistor R2701. Bluetooth communication M1 pin 11 is connected to the controller main control circuit 7 through resistor R2801. Bluetooth communication M1 pin 12 is connected to the controller main control circuit 7 through resistor R2901. Bluetooth communication M1 pin 13 is connected to one end of capacitor C1901, one end of capacitor C1801, one end of resistor R2601, and the collector of transistor Q501. The other ends of capacitors C1901 and C1801 are grounded. The base of transistor Q501 is connected to the controller main control circuit 7 through resistor R2501. The other end of resistor R2601 and the emitter of transistor Q501 are connected to the controller voltage regulator circuit 8. Bluetooth communication M1 pins 16-18 are connected to the controller bidirectional broadcast Bluetooth circuit 10. Bluetooth communication M1 pin 19 is grounded.

[0055] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A handheld body fat scale circuit, characterized in that: The system includes a scale body and a handle. The scale body has a scale charging circuit (1) connected to an adapter for charging the scale body battery BAT1, a male connector PL1 connected to the scale charging circuit (1) for charging the handle, a scale main control circuit (2) for controlling the male connector PL1 to charge the handle, and a scale voltage regulator circuit (3) connected to the scale body battery BAT1 for regulating the power supply to the scale main control circuit (2). The scale body has a handle storage slot for placing the handle, and a magnet is located on the side of the scale body near the handle storage slot. The handle has a female connector that plugs into the male connector PL1. The components include a connector PL2, a handle charging circuit (4) connected to the female connector PL2 for charging the handle battery BAT2, a Hall sensor circuit (5) for detecting whether the handle is inserted into the handle storage slot near the magnet, a fat measuring electrode circuit (6) for handheld fat measurement, a handle main control circuit (7) for calculating body fat information based on the information detected by the fat measuring electrode circuit (6) and entering standby mode when the Hall sensor circuit (5) detects the magnet, and a handle voltage regulator circuit (8) connected to the handle battery BAT2 for stabilizing the power supply to the handle main control circuit (7) and the Hall sensor circuit (5).

2. The circuit of a handheld body fat scale according to claim 1, characterized in that: The scale body is equipped with a scale body two-way broadcast Bluetooth circuit (9) connected to the scale body main control circuit (2), and the handle is equipped with a handle two-way broadcast Bluetooth circuit (10) connected to the handle main control circuit (7) for wireless communication with the scale body two-way broadcast Bluetooth circuit (9). The scale body voltage regulator circuit (3) supplies power to the scale body two-way broadcast Bluetooth circuit (9), and the handle voltage regulator circuit (8) supplies power to the handle two-way broadcast Bluetooth circuit (10).

3. The handheld body fat scale circuit according to claim 2, characterized in that: The scale body is equipped with a weighing sensor circuit (11) connected to the scale body main control circuit (2) for weighing, a display circuit (12) for displaying weighing data and body fat data, and a buzzer circuit (13) for voice prompts. The scale body voltage stabilizing circuit (3) supplies power to the buzzer circuit (13).

4. The circuit of a handheld body fat scale according to claim 2, characterized in that: The handle is equipped with a Bluetooth master control circuit (14) for wireless communication with smart devices and a power indicator circuit (15) for indicating the charging status of the handle battery BAT2. The handle voltage regulator circuit (8) supplies power to the Bluetooth master control circuit (14) and the power indicator circuit (15) respectively.

5. The handheld body fat scale circuit according to claim 3, characterized in that: The scale charging circuit (1) includes a charging chip U1. Pin 1 of the charging chip U1 is connected to the scale main control circuit (2). Pin 2 of the charging chip U1 is grounded. Pin 4 of the charging chip U1 is connected to one end of resistor R3, one end of resistor R1, the positive terminal of diode DO1, one end of capacitor C2, one end of capacitor C1, and pin 1 of adapter connection terminal PW. The other end of resistor R3 is connected to one end of resistor R4 and the gate of MOS transistor Q1. The other end of resistor R1 is connected to one end of resistor R2, one end of capacitor C3, and the scale main control circuit (2). Pin 2 of adapter connection terminal PW, the other end of capacitor C1, and the other end of capacitor C2 are connected to... One end of the capacitor C3, the other end of the resistor R2, and the other end of the resistor R4 are grounded respectively. The 3rd pin of the charging chip U1 is connected to the positive terminal of the scale battery BAT1, one end of the capacitor C4, one end of the capacitor C5, one end of the resistor R6, and the drain terminal of the MOS transistor Q1 respectively. The 5th pin of the charging chip U1 is connected to one end of the resistor R5. The other end of the resistor R5, the negative terminal of the scale battery BAT1, the other end of the capacitor C4, and the other end of the capacitor C5 are grounded respectively. The negative terminal of the diode DO1 is connected to the source terminal of the MOS transistor Q1 and the other end of the resistor R6 respectively. The output power VDD of the negative terminal of the diode DO1 is connected to the scale voltage regulator circuit (3). The scale body voltage regulator circuit (3) includes a voltage regulator chip U2. The Vi terminal of the voltage regulator chip U2 is connected to one end of resistor R7, one end of capacitor C7, one end of capacitor C6, and the negative terminal of diode DO1. The GE terminal of the voltage regulator chip U2 is connected to the other end of resistor R7 and the collector of transistor Q2. The base of transistor Q2 is connected to one end of capacitor C10 and one end of resistor R9 through resistor R8. The emitter of transistor Q2 and the other end of resistor R9 are grounded. The other end of capacitor C10 is connected to the adapter connection terminal PW pin 1. The Vo terminal of the voltage regulator chip U2 is connected to one end of capacitor C8 and one end of capacitor C9. The other ends of capacitor C6, capacitor C7, the G terminal of the voltage regulator chip U2, the other end of capacitor C8, and the other end of capacitor C9 are grounded. The Vo terminal of the voltage regulator chip U2 outputs power supply VCC to the scale body main control circuit (2), the scale body two-way broadcast Bluetooth circuit (9), and the buzzer circuit (13).

6. The circuit of a handheld body fat scale according to claim 3, characterized in that: The main control circuit (2) of the scale body includes a main control chip U3. Pin 5 of the main control chip U3 is connected to one end of the scale body voltage regulator circuit (3) and capacitor C11, respectively. The other end of capacitor C11 is grounded. Pin 6 of the main control chip U3 is grounded through capacitor C12. Pin 7 of the main control chip U3 is connected to one end of the scale body voltage regulator circuit (3) and capacitor C13, respectively. The other end of capacitor C13 is grounded. Pin 8 of the main control chip U3 is connected to one end of capacitor C14 and one end of resistor R15, respectively. The other end of capacitor C14 is grounded. The other end of resistor R15 is connected to the weighing sensor circuit (11). Pin 9 of the main control chip U3 is connected to one end of capacitor C15, one end of capacitor C16, one end of capacitor C17 and one end of resistor R16, respectively. The other end of capacitor C17 is grounded. The other end of resistor R16 is connected to the weighing sensor circuit (11). Pin 10 of the main control chip U3 is connected to the other end of capacitor C15, one end of capacitor C16 and one end of capacitor C18, respectively. One end of resistor R17 is connected, the other end of capacitor C18 is grounded, the other end of resistor R17 is connected to the weighing sensor circuit (11), pin 11 of the main control chip U3 is connected to one end of resistor R13 and one end of resistor R14 respectively, the other end of resistor R13 is connected to the positive terminal of the scale battery BAT1, the other end of resistor R14 is grounded, pin 13 of the main control chip U3 is grounded through the switch button UNIT, pins 14-15 of the main control chip U3 are connected to the scale charging circuit (1) respectively, pin 16 of the main control chip U3 is connected to one end of resistor R26 and male connector PL1 respectively, the other end of resistor R26 is grounded, pins 17-19 and pins 21-22 of the main control chip U3 are connected to the scale bidirectional broadcast Bluetooth circuit (9) respectively, pin 20 of the main control chip U3 is connected to the buzzer circuit (13), pins 25-32 of the main control chip U3 are connected to the display circuit (12) respectively, and pin 33 of the main control chip U3 is grounded.

7. The circuit of a handheld body fat scale according to claim 3, characterized in that: The two-way broadcast Bluetooth circuit (9) of the scale body includes a storage chip U6 and a Bluetooth broadcast chip U5. Pins 1-4 and pin 7 of the storage chip U6 are grounded respectively. Pin 5 of the storage chip U6 is connected to the main control circuit (2) of the scale body and one end of resistor R24. The other end of resistor R24 ​​is connected to the voltage regulator circuit (3) of the scale body. Pin 6 of the storage chip U6 is connected to the main control circuit (2) of the scale body and one end of resistor R23. The other end of resistor R23 is connected to the voltage regulator circuit (3) of the scale body. Pin 8 of the storage chip U6 is connected to the voltage regulator circuit (3) of the scale body. One end of capacitor C28 is connected to the voltage regulator circuit (3) of the scale body, and the other end of capacitor C28 is grounded. Pin 1 of the Bluetooth broadcast chip U5 is connected to the main control circuit (2) of the scale body through resistor R25. Pin 2 of the Bluetooth broadcast chip U5 is connected to the main control circuit (2) of the scale body through resistor R20. Pin 3 of the Bluetooth broadcast chip U5 is connected to the main control circuit (2) of the scale body. Through resistor R21, the main control circuit (2) of the scale is connected. The pin 4 of the Bluetooth broadcast chip U5 is connected to one end of capacitor C22, one end of capacitor C21, and the scale voltage regulator circuit (3) respectively. The other end of capacitor C22 and the other end of capacitor C21 are grounded respectively. The pin 5 of the Bluetooth broadcast chip U5 is connected to pin 1 of crystal oscillator Y1 and one end of capacitor C26 respectively. The pin 6 of the Bluetooth broadcast chip U5 is connected to pin 3 of crystal oscillator Y1 and one end of capacitor C27 respectively. The other end of capacitor C26, the other end of capacitor C27, pin 2 and pin 4 of crystal oscillator Y1 are grounded respectively. The pin 7 of the Bluetooth broadcast chip U5 is grounded. The pin 8 of the Bluetooth broadcast chip U5 is connected to one end of resistor R22 and one end of capacitor C24 through capacitor C23 respectively. The other end of resistor R22 is connected to antenna A1 and one end of capacitor C25 respectively. The other end of capacitor C24 is grounded respectively.

8. The circuit of a handheld body fat scale according to claim 4, characterized in that: The controller charging circuit (4) includes a charging chip U101. Pin 1 of the charging chip U101 is connected to the controller main control circuit (7). Pin 2 of the charging chip U101 is grounded. Pin 4 of the charging chip U101 is connected to one end of resistor R301, one end of resistor R101, the positive terminal of diode DO101, one end of capacitor C201, one end of capacitor C101, and pin 1 of the female connector PL2. The other end of resistor R301 is connected to one end of resistor R401 and the gate of MOSFET Q101. The other end of resistor R101 is connected to one end of resistor R201, one end of capacitor C301, and the controller main control circuit (7). Pin 2 of the female connector PL2, the other end of capacitor C101, and the other end of capacitor C201 are also connected to the controller main control circuit (7). One end of the capacitor C301, the other end of the resistor R201, and the other end of the resistor R401 are respectively grounded. The pin 3 of the charging chip U101 is connected to the positive terminal of the handle battery BAT2, one end of the capacitor C401, one end of the capacitor C501, one end of the resistor R601, and the drain terminal of the MOS transistor Q101. The pin 5 of the charging chip U101 is connected to one end of the resistor R501. The other end of the resistor R501, the negative terminal of the handle battery BAT2, the other end of the capacitor C401, and the other end of the capacitor C501 are respectively grounded. The negative terminal of the diode DO101 is connected to the source terminal of the MOS transistor Q101 and the other end of the resistor R601. The output power VDD of the negative terminal of the diode DO101 is connected to the handle voltage regulator circuit (8). The handle voltage regulator circuit (8) includes a voltage regulator chip U201. The Vi terminal of the voltage regulator chip U201 is connected to one end of resistor R701, one end of capacitor C701, one end of capacitor C601, and the negative terminal of diode DO101. The GE terminal of the voltage regulator chip U201 is connected to the other end of resistor R701 and the collector of transistor Q201. The base of transistor Q201 is connected to one end of capacitor C1001 and one end of resistor R901 through resistor R801. The emitter of transistor Q201 and the other end of resistor R901 are grounded. The other end of 1001 is connected to pin 1 of PL2 of the female connector. The Vo terminal of the voltage regulator chip U201 is connected to one end of capacitor C801 and one end of capacitor C901 respectively. The other ends of capacitor C601, capacitor C701, voltage regulator chip U201, capacitor C801, and capacitor C901 are grounded respectively. The power supply VCC output by the Vo terminal of voltage regulator chip U201 supplies power to the main control circuit (7) of the handle, the two-way broadcast Bluetooth circuit (10) of the handle, the Bluetooth main control circuit (14), and the power indicator circuit (15).

9. The circuit of a handheld body fat scale according to claim 4, characterized in that: The main control circuit (7) of the controller includes a main control chip U301. Pin 1 of the main control chip U301 is grounded. Pin 2 of the main control chip U301 is connected to one end of resistor R1201 and one end of resistor R1301 respectively. Resistor R1201 is connected to the controller charging circuit (4). The other end of resistor R1301 is grounded. Pin 3 of the main control chip U301 is connected to one end of resistor R2201, one end of capacitor C1101, and the controller voltage regulator circuit (8) respectively. The other end is connected to pin 4 of the main control chip U301 and one end of capacitor C1201, respectively. The other ends of capacitors C1101 and C1201 are grounded. Pins 6 and 9 of the main control chip U301 are grounded. Pin 10 of the main control chip U301 is connected to pin 11 of the main control chip U301 through capacitor C1301. Pins 12-15 of the main control chip U301 are connected to the lipid measurement electrode circuit (6), respectively. Pin 16 of the main control chip U301 is connected to... Resistor R1401 is connected to one end of resistor R1501, pin 18 of main control chip U301, and one end of resistor R1601. Resistor R1501 is connected to pin 17 of main control chip U301. The other end of resistor R1601 is connected to pin 19 of main control chip U301 through capacitor C1401. Pin 20 of main control chip U301 is grounded through capacitor C1501. Pin 23 of main control chip U301 is connected to resistor R310 through resistor R3001.

1. One end is connected to the Hall sensor circuit (5), the other end of the resistor R3101 is connected to the female connector PL2, pin 24 of the main control chip U301 is connected to the handle voltage regulator circuit (8), pins 25-28 of the main control chip U301 are connected to the Bluetooth main control circuit (14), pins 31-32 of the main control chip U301 are connected to the handle charging circuit (4), and pins 33-34 of the main control chip U301 are connected to the power indicator light circuit (15).

10. The circuit of a handheld body fat scale according to claim 4, characterized in that: The two-way broadcast Bluetooth circuit (10) of the controller includes a Bluetooth broadcast chip U501. Pin 1 of the Bluetooth broadcast chip U501 is connected to the Bluetooth main control circuit (14) through resistor R3401. Pin 2 of the Bluetooth broadcast chip U501 is connected to the Bluetooth main control circuit (14) through resistor R2301. Pin 3 of the Bluetooth broadcast chip U501 is connected to the Bluetooth main control circuit (14) through resistor R2401. Pin 4 of the Bluetooth broadcast chip U501 is connected to one end of capacitor C2201, one end of capacitor C2101, and the controller voltage regulator circuit (8) respectively. The other ends of capacitor C2201 and C2101 are grounded respectively. Pin 5 of the Bluetooth broadcast chip U501 is connected to... Do not connect to pin 1 of crystal oscillator Y101 or one end of capacitor 2601. Connect pin 6 of Bluetooth broadcast chip U501 to pin 3 of crystal oscillator Y101 and one end of capacitor 2701. Ground the other end of capacitor 2601, the other end of capacitor 2701, pin 2 of crystal oscillator Y101, and pin 4 of crystal oscillator Y101. Ground pin 7 of Bluetooth broadcast chip U501. Connect pin 8 of Bluetooth broadcast chip U501 to one end of resistor R2201 and one end of capacitor C2401 through capacitor C2301. Connect the other end of resistor R2201 to antenna A101 and one end of capacitor C2501. Ground the other end of capacitor C2401 and the other end of capacitor C2501. The Bluetooth main control circuit (14) includes Bluetooth communication M1. Bluetooth communication M1 pin 9 is grounded. Bluetooth communication M1 pin 10 is connected to the controller main control circuit (7) via resistor R2701. Bluetooth communication M1 pin 11 is connected to the controller main control circuit (7) via resistor R2801. Bluetooth communication M1 pin 12 is connected to the controller main control circuit (7) via resistor R2901. Bluetooth communication M1 pin 13 is connected to one end of capacitor C1901, one end of capacitor C1801, and... One end of resistor R2601 is connected to the collector of transistor Q501, the other ends of capacitor C1901 and capacitor C1801 are grounded respectively, the base of transistor Q501 is connected to the main control circuit (7) of the handle through resistor R2501, the other end of resistor R2601 and the emitter of transistor Q501 are connected to the voltage regulator circuit (8) of the handle respectively, the Bluetooth communication M1 pins 16-18 are connected to the two-way broadcast Bluetooth circuit (10) of the handle respectively, and the Bluetooth communication M1 pin 19 is grounded.

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