Weighing system

Abstract

The utility model discloses a weighing system, which is used for a washing machine, the washing machine is provided with a feeding box for placing a detergent, the weighing system comprises a sensing module, a control module, a current generation module and a conversion resistor, the sensing module is used for weighing the detergent in the feeding box and generating a sensing signal for representing the weight, and the control module is used for controlling the current generation module to generate the conversion resistor. The control module is connected with the sensing module to receive a sensing signal and generate a voltage signal based on the sensing signal, the current generation module is connected with the control module and the conversion resistor to generate a current signal on the conversion resistor based on the voltage signal, and the conversion resistor is connected with external equipment to output the current signal. According to the weighing system, the residual amount of the detergent can be output through the current signal, so that the residual amount of the detergent can be accurately recorded and analyzed by external equipment. The control module can also calculate whether the current detergent remaining amount is smaller than the set minimum threshold value or not, and indication is carried out through the display module.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensor detection, in particular to a weighing system. Background Art

[0002] In current washing machines, detergent is typically loaded into a cylindrical device. Water flushes the detergent, gradually reducing the amount until it is completely used up. This process requires regular manual checks of the remaining detergent level and estimation of when to replace and refill it, making it cumbersome and unintelligent. When the detergent runs out, there's no way to alert the operator to add new detergent. Failure to add detergent promptly requires not only rewashing the laundry but also determining which items have been left unwashed, which can lead to confusion in the washing process.

[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0004] The purpose of the utility model is to provide a weighing system, which can weigh the remaining detergent in a washing machine and provide timely feedback on the remaining detergent amount.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by a specific embodiment of the present invention is as follows:

[0006] A weighing system for a washing machine, wherein the washing machine is provided with a feeding box for placing detergent. The weighing system includes a sensing module, a control module, a current generating module and a conversion resistor. The sensing module is used to weigh the detergent in the feeding box and generate a sensing signal for representing the weight. The control module is connected to the sensing module to receive the sensing signal and generate a voltage signal based on the sensing signal. The current generating module is connected to the control module and the conversion resistor to generate a current signal on the conversion resistor based on the voltage signal. The conversion resistor is connected to an external device to output the current signal.

[0007] In one or more embodiments of the present invention, the current generating module includes an amplifier, a transistor, a first voltage dividing unit and a second voltage dividing unit, the first voltage dividing unit having a first voltage dividing node, and the second voltage dividing unit having a second voltage dividing node; the first end of the first voltage dividing unit is connected to the control module to receive a voltage signal, and the second end of the first voltage dividing unit is connected to the first end of the conversion resistor; the first end of the second voltage dividing unit is connected to the second end of the conversion resistor, and the second end of the second voltage dividing unit is connected to the ground voltage; the first input end of the amplifier is connected to the first voltage dividing node, the second input end of the amplifier is connected to the second voltage dividing node, the output end of the amplifier is connected to the control end of the transistor, the first end of the transistor is connected to the second end of the conversion resistor, and the second end of the transistor is connected to the power supply voltage.

[0008] In one or more embodiments of the present invention, the first voltage-dividing unit includes a first voltage-dividing resistor and a second voltage-dividing resistor, the first end of the first voltage-dividing resistor is used to form the first end of the first voltage-dividing unit, the second end of the first voltage-dividing resistor is connected to the first end of the second voltage-dividing resistor to form a voltage-dividing node of the first voltage-dividing unit, and the second end of the second voltage-dividing resistor is used to form the second end of the first voltage-dividing unit; and / or the second voltage-dividing unit includes a third voltage-dividing resistor and a fourth voltage-dividing resistor, the first end of the third voltage-dividing resistor is used to form the first end of the second voltage-dividing unit, the second end of the third voltage-dividing resistor is connected to the first end of the fourth voltage-dividing resistor to form a second voltage-dividing node, and the second end of the fourth voltage-dividing resistor is used to form the second end of the second voltage-dividing unit.

[0009] In one or more embodiments of the present invention, the weighing system further includes a voltage follower, an input end of the voltage follower is connected to the control module to receive a voltage signal, and an output end of the voltage follower is connected to the current generating module.

[0010] In one or more embodiments of the present invention, the weighing system further includes a filter circuit connected to the control module and the current generating module to filter the voltage signal.

[0011] In one or more embodiments of the present invention, the weighing system further includes a display module, and the display module is connected to the control module.

[0012] In one or more embodiments of the present invention, the weighing system further includes an input module connected to the control module.

[0013] In one or more embodiments of the present invention, the control module includes a CH554T chip.

[0014] In one or more embodiments of the present invention, the sensing module includes a sensor and an analog-to-digital converter. The sensor is used to weigh the detergent and generate a weight signal for representing the weight. The analog-to-digital converter is connected to the sensor to perform analog-to-digital conversion on the weight signal to generate a sensing signal.

[0015] In one or more embodiments of the present invention, the analog-to-digital converter includes an HX711 chip.

[0016] Compared to existing technologies, the weighing system of this utility model can monitor the detergent in the washing machine in real time. The control module calculates the current detergent level and outputs the remaining detergent level via a current signal. External equipment can accurately record and analyze the remaining detergent. The control module can also calculate whether the current detergent level is less than a set minimum threshold and indicate this via the display module, reminding workers to add or replace detergent in a timely manner, thereby reducing frequent manual intervention and greatly improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a system structure diagram of a weighing system in one embodiment of the present utility model.

[0019] Figure 2 This is a circuit diagram of a power module in one embodiment of the present invention.

[0020] Figure 3 This is a circuit schematic diagram of a sensor module in one embodiment of the present invention.

[0021] Figure 4 This is a circuit schematic diagram of the input module, control module and display module in one embodiment of the present invention.

[0022] Figure 5 This is a circuit schematic diagram of a voltage follower, a filter circuit, a current generating module and a conversion resistor in one embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] The terms "coupled," "connected," or "connected" in this specification encompass both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as an electrically conductive medium, which may have parasitic inductance or capacitance. An indirect connection may also include a connection through other active or passive devices, such as switches, follower circuits, or other circuits or components, to achieve the same or similar functional objectives. Furthermore, in this specification, terms such as "first" and "second" are primarily used to distinguish one technical feature from another and do not necessarily require or imply a specific relationship, quantity, or order between these technical features.

[0025] In the detailed description of the specification, reference is made to the accompanying drawings forming a part thereof, wherein like reference numerals designate like parts throughout, and wherein exemplary embodiments that may be implemented are shown by way of example. It should be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present disclosure. Therefore, the following detailed description should not be construed in a limiting sense.

[0026] The various operations in the specification may be described as multiple discrete actions or operations in a manner that is most helpful in understanding the claimed subject matter. However, the order of description should not be interpreted as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in an order different from the described embodiments. Various additional operations may be performed and / or the described operations may be omitted in additional embodiments.

[0027] For the purposes of this disclosure, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this disclosure, the phrase "A, B and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0028] Various components and devices may be referred to or shown in the singular form in this document (for example, "MOS tube", "transistor", "switch", etc.), but this is only for convenience of discussion, and any element referred to in the singular form may include multiple such elements according to the teachings of this document.

[0029] The specification uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," which can each refer to one or more of the same or different embodiments. In addition, the terms "including," "comprising," "having," etc. used with respect to the embodiments of the present disclosure are synonymous.

[0030] like Figure 1 As shown, the weighing system in one embodiment of the present invention includes a power module 10, a sensor module 20, a control module 30, a display module 40, an input module 50, a filter circuit 60, a voltage follower 70, a current generating module 80 and a conversion resistor R23.

[0031] The weighing system in the present application is used for a washing machine, which is provided with a feeding box for placing detergent. The sensing module 20 is used to weigh the detergent in the feeding box and generate a sensing signal DOUT1 for representing the weight. The control module 30 is connected to the sensing module 20 to receive the sensing signal DOUT1 and generate a voltage signal PWM1 based on the sensing signal DOUT1. The filtering circuit 60 is connected to the control module 30 to filter the voltage signal PWM1. The input end of the voltage follower 70 is connected to the filtering circuit 60 to receive the voltage signal PWM1, and the output end of the voltage follower 70 is connected to the current generating module 80. The current generating module 80 is connected to the conversion resistor R23 to generate a current signal MA_OUT on the conversion resistor R23 based on the voltage signal PWM1, and the conversion resistor R23 is connected to an external device to output the current signal MA_OUT.

[0032] The input module 50 is connected to the control module 30 and is used to input signals to the control module 30. The display module 40 is connected to the control module 30 and is used to display based on the control of the control module 30. The power module 10 is connected to the power supply voltage (24V) to convert the power supply voltage to the operating voltage (5V) required by other modules.

[0033] like Figure 2 As shown, the power module 10 includes a voltage conversion chip U2 and its peripheral circuits. The model of the voltage conversion chip U2 is preferably MC78M05ACT.

[0034] Pin 1 of the voltage conversion chip U2 is connected to the 24V power supply voltage, pin 2 of the voltage conversion chip U2 is connected to the ground voltage, and pin 3 of the voltage conversion chip U2 is used to output a 5V operating voltage.

[0035] like Figure 3As shown, the sensing module 20 includes a sensor (not shown) and an analog-to-digital converter. The sensor is used to weigh the detergent and generate weight signals A1+ and A1- (weight signals A1+ and A1- are a pair of differential signals) to represent the weight. The analog-to-digital converter is connected to the sensor to perform analog-to-digital conversion on the weight signals A1+ and A1- to generate a sensing signal DOUT1.

[0036] like Figure 3 As shown, the analog-to-digital converter includes an ADC chip U3 and its peripheral circuits. The model of the ADC chip U3 is preferably HX711.

[0037] Pin 7 of the ADC chip U3 is connected to the sensor to receive the weight signal A1+, and pin 8 of the ADC chip U3 is connected to the sensor to receive the weight signal A1-. The ADC chip U3 is used to perform analog-to-digital conversion on the weight signals A1+ and A1- and output the sensor signal DOUT1 through its own pin 12.

[0038] like Figure 4 As shown, the control module 30 includes a control chip U1 and its peripheral circuits. The model of the control chip U1 is preferably CH554T.

[0039] Pin 1 of the control chip U1 is connected to pin 12 of the ADC chip U3 to receive the sensing signal DOUT1. The control chip U1 generates a voltage signal PWM1 through its own pin 10 based on the sensing signal DOUT1. The voltage signal PWM1 represents weight information through the voltage magnitude.

[0040] In one embodiment, the control chip U1 also generates a first light signal KEY_LED1 through its own pin 3, generates a second light signal KEY_LED2 through its own pin 15, generates a buzzer signal BEEP through its own pin 7, generates a first output signal LED0 through its own pin 9, and generates a second output signal LED1 through its own pin 8 based on the weight information in the sensor signal DOUT1.

[0041] like Figure 4 As shown, the input module 50 includes a first switch unit and a second switch unit.

[0042] The first switch unit includes a switch S2, a resistor R2, and a capacitor C11. The first end of the resistor R2 is connected to a 5V operating voltage, the second end of the resistor R2, the first end of the switch S2, and the first end of the capacitor C11 are connected to pin 12 of the control chip U1 to generate a first switching signal KE0, and the second end of the switch S2 and the second end of the capacitor C11 are connected to ground.

[0043] The second switching unit includes a switch S1, a resistor R4, and a capacitor C4. The first end of the resistor R4 is connected to a 5V operating voltage. The second end of the resistor R4, the first end of the switch S1, and the first end of the capacitor C4 are connected to pin 11 of the control chip U1 to generate a second switching signal KE1. The second end of the switch S1 and the second end of the capacitor C4 are connected to ground.

[0044] By controlling the on and off states of switches S1 and S2, different first and second switch signals KE0 and KE1 are input to control chip U1, thereby controlling control chip U1. In one embodiment, control chip U1 can calibrate the slope and offset of the weighing process based on the first and second switch signals KE0 and KE1, and can also set the minimum detergent threshold based on the first and second switch signals KE0 and KE1. This embodiment does not limit the specific functions of the first and second switch signals KE0 and KE1.

[0045] like Figure 4 As shown, the display module 40 includes a light-emitting diode LED1 and a light-emitting diode LED2. The anode of the light-emitting diode LED1 is connected to pin 3 of the control chip U1 to receive a first light-emitting signal KEY_LED1, and the cathode of the light-emitting diode LED1 is connected to the ground voltage via a resistor R6. The anode of the light-emitting diode LED2 is connected to pin 15 of the control chip U1 to receive a second light-emitting signal KEY_LED2, and the cathode of the light-emitting diode LED1 is connected to the ground voltage via a resistor R16.

[0046] In one embodiment, the display module 40 further includes a buzzer, a first external light-emitting unit, a second external light-emitting unit, and transistors Q3, Q5, Q6, resistors R11, R3, and R5. The base of transistor Q3 is connected to pin 7 of the control chip U1 via resistor R11 to receive a buzzer signal BEEP. The emitter of transistor Q3 is connected to ground voltage, and the collector of transistor Q3 is connected to the buzzer via connector P5. The base of transistor Q5 is connected to pin 9 of the control chip U1 via resistor R3 to receive a first output signal LED0. The emitter of transistor Q5 is connected to ground voltage, and the collector of transistor Q5 is connected to the first external light-emitting unit via connector P2. The base of transistor Q6 is connected to pin 8 of the control chip U1 via resistor R5 to receive a second output signal LED1. The emitter of transistor Q6 is connected to ground voltage, and the collector of transistor Q6 is connected to the second external light-emitting unit via connector P6.

[0047] The control chip U1 controls the display module to emit light and emit a buzzer warning function through a series of signals including the first light-emitting signal KEY_LED1, the second light-emitting signal KEY_LED2, the buzzer signal BEEP, the first output signal LED0, and the second output signal LED1.

[0048] like Figure 5 As shown, the filter circuit 60 includes a resistor R20 and a capacitor C21. The first end of the resistor R20 is connected to the pin 10 of the control chip U1 to receive the voltage signal PWM1. The second end of the resistor R20 and the first end of the capacitor C21 are connected to the input end of the voltage follower 70. The second end of the capacitor C21 is connected to the ground voltage.

[0049] like Figure 5 As shown, the voltage follower 70 includes an amplifier chip U5A. The positive input terminal of the amplifier chip U5A is connected to the second end of the resistor R20 and the first end of the capacitor C21 to form the input terminal of the voltage follower 70. The negative input terminal of the amplifier chip U5A is connected to the output terminal of the amplifier chip U5A to form the output terminal of the voltage follower 70.

[0050] like Figure 5 As shown, the current generating module 80 includes an amplifier U5B, a transistor Q4, a first voltage dividing unit and a second voltage dividing unit. The first voltage dividing unit has a first voltage dividing node, and the second voltage dividing unit has a second voltage dividing node.

[0051] A first end of the first voltage divider unit is connected to the output end of the amplifier chip U5A to receive the voltage signal PWM1. A second end of the first voltage divider unit is connected to the first end of the conversion resistor R23. A first end of the second voltage divider unit is connected to the second end of the conversion resistor R23. A second end of the second voltage divider unit is connected to the ground voltage.

[0052] A first input terminal of the amplifier U5B is connected to the first voltage dividing node, a second input terminal of the amplifier U5B is connected to the second voltage dividing node, an output terminal of the amplifier U5B is connected to the control terminal of the transistor Q4, a first terminal of the transistor Q4 is connected to the second terminal of the conversion resistor R23, and a second terminal of the transistor Q4 is connected to the power supply voltage.

[0053] The first voltage-dividing unit includes a first voltage-dividing resistor R21 and a second voltage-dividing resistor R17. The first end of the first voltage-dividing resistor R21 is used to form the first end of the first voltage-dividing unit, the second end of the first voltage-dividing resistor R21 is connected to the first end of the second voltage-dividing resistor R17 to form a voltage-dividing node of the first voltage-dividing unit, and the second end of the second voltage-dividing resistor R17 is used to form the second end of the first voltage-dividing unit.

[0054] The second voltage-dividing unit includes a third voltage-dividing resistor R25 and a fourth voltage-dividing resistor R24. The first end of the third voltage-dividing resistor R25 is used to form the first end of the second voltage-dividing unit, the second end of the third voltage-dividing resistor R25 is connected to the first end of the fourth voltage-dividing resistor R24 ​​to form a second voltage-dividing node, and the second end of the fourth voltage-dividing resistor R24 ​​is used to form the second end of the second voltage-dividing unit.

[0055] In one embodiment, the resistances of the first voltage-divider resistor R21, the second voltage-divider resistor R17, the third voltage-divider resistor R25, and the fourth voltage-divider resistor R24 ​​are all equal. The first input terminal of the amplifier U5B is a positive input terminal, and the second input terminal of the amplifier U5B is a negative input terminal. The transistor Q4 is an NPN transistor, wherein the first terminal of the transistor Q4 is an emitter, the second terminal of the transistor Q4 is a collector, and the control terminal of the transistor Q4 is a base.

[0056] Due to the virtual short circuit, the voltage at the first input terminal of amplifier U5B is equal to the voltage at the second input terminal of amplifier U5B. The voltage at the second terminal of conversion resistor R23 is denoted as U1, the voltage at the first terminal of conversion resistor R23 is denoted as U2, the voltage value of voltage signal PWM1 is denoted as Uin, and the resistance value of conversion resistor R23 is denoted as R23.

[0057] Through voltage division by the first voltage divider unit, the voltages at the first input terminal and the second input terminal of the amplifier U5B are both (Uin-U2) / 2+U2.

[0058] After voltage division by the second voltage dividing unit, the voltage U1 is 2*((Uin-U2) / 2+U2)=Uin+U2.

[0059] The voltage difference across the conversion resistor R23 is U1 - U2 = Uin, and the magnitude of the current signal on the conversion resistor R23 is Uin / R23.

[0060] In other embodiments, the resistance values ​​of the first voltage-dividing resistor R21, the second voltage-dividing resistor R17, the third voltage-dividing resistor R25, and the fourth voltage-dividing resistor R24 ​​can be in other ratios. By modifying the ratios of the respective voltage-dividing resistors, the ratio between the current signal and the voltage signal PWM1 can be adjusted. Transistor Q4 can also be a PNP transistor or other device, and its connection method can be adaptively adjusted.

[0061] During the actual operation, the 24V input power voltage is first converted into a 5V operating voltage through the power module 10. After the control chip U1 is powered on, the control chip U1 can be controlled by switches S1 and S2 to calibrate the slope and bias value of the weighing. After the calibration is completed, the sensor weighs the detergent and generates weight signals A1+ and A1- for representing the weight. The ADC chip U3 performs analog-to-digital conversion on the weight signals A1+ and A1- and outputs the sensing signal DOUT1. The control chip U1 then generates a voltage signal PWM1 based on the sensing signal DOUT1. The current generating module 80 generates a current signal proportional to the voltage signal PWM1 on the conversion resistor based on the voltage signal PWM1. The external device can obtain the weight of the detergent in the washing machine by detecting the size of the current signal and further perform management and control.

[0062] At the same time, the control chip U1 calculates the weight of the detergent through the sensor signal DOUT1 and monitors it. When it is found that the weight of the detergent is less than the set minimum threshold, the control chip U1 can control the display module 40 to light up and beep through a series of signals including the first light-emitting signal KEY_LED1, the second light-emitting signal KEY_LED2, the buzzer signal BEEP, the first output signal LED0, and the second output signal LED1, to remind the staff that the detergent is insufficient, and to add and replace it in time to ensure that the washing work is carried out in an orderly manner.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0064] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A weighing system for a washing machine, characterized in that: The washing machine is provided with a feeding box for placing detergent, and the weighing system includes a sensing module, a control module, a current generating module and a conversion resistor. The sensing module is used to weigh the detergent in the feeding box and generate a sensing signal for representing the weight. The control module is connected to the sensing module to receive the sensing signal and generate a voltage signal based on the sensing signal. The current generating module is connected to the control module and the conversion resistor to generate a current signal on the conversion resistor based on the voltage signal. The conversion resistor is connected to an external device to output the current signal.

2. The weighing system according to claim 1, characterized in that The current generating module includes an amplifier, a transistor, a first voltage dividing unit and a second voltage dividing unit, wherein the first voltage dividing unit has a first voltage dividing node and the second voltage dividing unit has a second voltage dividing node; A first end of the first voltage dividing unit is connected to the control module to receive a voltage signal, and a second end of the first voltage dividing unit is connected to a first end of the conversion resistor; The first end of the second voltage dividing unit is connected to the second end of the conversion resistor, and the second end of the second voltage dividing unit is connected to the ground voltage; The first input terminal of the amplifier is connected to the first voltage dividing node, the second input terminal of the amplifier is connected to the second voltage dividing node, the output terminal of the amplifier is connected to the control terminal of the transistor, the first terminal of the transistor is connected to the second terminal of the conversion resistor, and the second terminal of the transistor is connected to the power supply voltage.

3. The weighing system according to claim 2, characterized in that The first voltage-dividing unit includes a first voltage-dividing resistor and a second voltage-dividing resistor, the first end of the first voltage-dividing resistor is used to form a first end of the first voltage-dividing unit, the second end of the first voltage-dividing resistor is connected to the first end of the second voltage-dividing resistor to form a voltage-dividing node of the first voltage-dividing unit, and the second end of the second voltage-dividing resistor is used to form a second end of the first voltage-dividing unit; and / or The second voltage-dividing unit includes a third voltage-dividing resistor and a fourth voltage-dividing resistor, the first end of the third voltage-dividing resistor is used to form the first end of the second voltage-dividing unit, the second end of the third voltage-dividing resistor is connected to the first end of the fourth voltage-dividing resistor to form a second voltage-dividing node, and the second end of the fourth voltage-dividing resistor is used to form the second end of the second voltage-dividing unit.

4. The weighing system according to claim 1, characterized in that: The weighing system further includes a voltage follower, an input end of the voltage follower is connected to the control module to receive a voltage signal, and an output end of the voltage follower is connected to the current generating module.

5. The weighing system according to claim 1, characterized in that: The weighing system further includes a filter circuit connected to the control module and the current generating module to filter the voltage signal.

6. The weighing system according to claim 1, characterized in that The weighing system further comprises a display module, and the display module is connected to the control module.

7. The weighing system according to claim 1, characterized in that: The weighing system further comprises an input module, which is connected to the control module.

8. The weighing system according to claim 1, characterized in that The control module includes a CH554T chip.

9. The weighing system according to claim 1, characterized in that: The sensing module includes a sensor and an analog-to-digital converter. The sensor is used to weigh the detergent and generate a weight signal for representing the weight. The analog-to-digital converter is connected to the sensor to perform analog-to-digital conversion on the weight signal to generate a sensing signal.

10. The weighing system according to claim 9, characterized in that: The analog-to-digital converter includes an HX711 chip.

Images