Household intelligent door lock for care of old people

Abstract

The utility model provides a household elderly care intelligent door lock which comprises a lock body, a door handle, a lamp switch relay, a door lock switch relay and a processor, the lock body is clamped on a door, an electromagnetic lock cylinder is arranged on the lock body, and a fingerprint identification module and a pressure sensor are sequentially arranged on the outer side face of the door handle. The electric lamp switch relay is electrically connected with the electric lamp, the photoelectric sensor is arranged on the lock body and used for sensing ambient light, the door lock switch relay is arranged on the lock body and electrically connected with the processor, and the processor is arranged in the lock body. And the controller is electrically connected with the fingerprint identification module, the pressure sensor, the lamp switch relay, the door lock switch relay and the photoelectric sensor. The processor can judge whether a person opens a door or not through the pressure sensor and verify identity information through the fingerprint identification module, and when light is weak, an indoor electric lamp can be linked while a door lock is opened, so that the old can open the door conveniently, and the door opening safety of the old at night is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of intelligent door locks, in particular to a household elderly care intelligent door lock. Background Art

[0002] With the development of the Internet of Things, smart homes have been widely used. Through mobile phones and other terminal devices, users can easily monitor and manage the status of their homes. For example, a series of applications such as timed ventilation, cleaning, checking water, electricity, and whether the door locks are closed have greatly facilitated people's daily lives.

[0003] However, existing smart door locks are usually verified by passwords. It is difficult for the elderly with poor eyesight to see numbers, so they often press the wrong keys and spend a lot of time opening the door. Even if a fingerprint recognition module is provided, the fingerprint recognition module is usually on the door lock and is small, making it difficult for the elderly to operate. In addition, existing smart door locks cannot be linked to indoor light switches. When the elderly return home at night, they need to find the switch in the dark, which poses a great safety hazard. Therefore, existing smart door locks are very inconvenient for the elderly and have a high learning cost. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a smart door lock for household elderly care. A fingerprint recognition module and a pressure sensor are provided on the door handle. The processor can determine whether someone has opened the door through the pressure sensor and verify the identity information through the fingerprint recognition module. The door lock is opened when the verification is passed. When the light is weak, the indoor light switch can be linked while opening the door lock, which not only makes it convenient for the elderly to open the door, but also ensures the safety of the elderly opening the door at night.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A household elderly care smart door lock, comprising:

[0007] A lock body is mounted on the door, and an electromagnetic lock cylinder is provided on the lock body and can move relative to the door;

[0008] The door handle has a fingerprint recognition module and a pressure sensor disposed on its outer surface in sequence. The fingerprint recognition module is used to obtain the user's fingerprint. The pressure sensor is disposed near the door frame to sense the pressure of the user's palm. When the user touches the fingerprint recognition module and the pressure sensor at the same time, the pressure sensor is used to detect whether someone has opened the door. The fingerprint recognition module verifies the received information.

[0009] A light switch relay electrically connected to the light;

[0010] Photoelectric sensor, located on the lock body, used to sense ambient light;

[0011] The door lock switch relay is arranged on the lock body and is electrically connected to the processor. The door lock switch relay is used to open the electromagnetic lock cylinder after receiving the door opening command issued by the processor;

[0012] The processor is arranged in the lock body and is electrically connected with the fingerprint recognition module, the pressure sensor, the light switch relay, the door lock switch relay and the photoelectric sensor.

[0013] Furthermore, the processor adopts an MSP430G2553 model microcontroller, the VCC pin of the processor is connected to a +3.3V power supply, and its RST pin is connected to the VCC pin through a reset switch S1 and a resistor R1, wherein the reset switch S1 is connected in series with a capacitor C1, and one end of the reset switch S1 also leads to a branch connected to the RST pin, and the other end is grounded.

[0014] Furthermore, the fingerprint recognition module is an FPM383C chip, the V_TOUCH pin and VCC pin of the FPM383C module are connected to a +3.3V power supply, the TOUCHOUT pin of the FPM383C module is connected to the first input IO port of the processor, the FPM383C module inputs fingerprint information to the processor through the first input IO port, and the TX and RX pins of the FPM383C module, i.e., the serial port interface, are connected to the processor through the second input IO port and the third input IO port respectively, and perform serial port communication with the processor.

[0015] Further, the pressure sensor comprises:

[0016] A first strain resistor, a second strain resistor, a third strain resistor and a fourth strain resistor, wherein the first strain resistor to the fourth strain resistor are connected to each other to form a differential half bridge;

[0017] An integrated operational amplifier, wherein the negative input terminal of the integrated operational amplifier is connected to the first end of the differential half bridge through a first strain resistor, the positive input terminal of the integrated operational amplifier is connected to the second end of the differential half bridge through a second strain resistor and a third strain resistor, the positive input terminal is also grounded through a fourth resistor, and the second end of the differential half bridge is also grounded through a first capacitor; the third and fourth ends of the differential half bridge are connected to a power supply, the power supply terminal of the integrated operational amplifier is connected to the power supply, the negative input terminal is also connected to the output terminal of the operational amplifier through a fifth resistor, and the output terminal is connected to a fourth input IO port of the processor.

[0018] Further, the light switch relay comprises:

[0019] The first SR latch and the first electromagnetic relay, the S input end of the first SR latch is connected to the fifth input IO port of the processor through the second resistor, the R input end of the SR latch is grounded, the output end of the SR latch is connected to the fourth port of the electromagnetic relay, the fifth port of the first electromagnetic relay is grounded, the first port is connected to the live wire, the third port is connected to the electric lamp, the second port of the electric lamp is connected to the neutral wire, the live wire and the neutral wire are connected to the two ends of the first jumper wire as the plug of the electric lamp.

[0020] Furthermore, the door lock switch relay includes:

[0021] A second electromagnetic relay, a second SR latch and a second jumper, the S input end of the second SR latch is connected to the sixth input IO port of the processor, the R input end of the second SR latch is grounded, the fourth port of the second electromagnetic relay is connected to the positive output end of the second SR latch, the fifth port is grounded, the second port is not connected to the circuit, and the first and third ports are connected to the second jumper.

[0022] Furthermore, the photoelectric sensor comprises:

[0023] LF353 integrated operational amplifier, UVTRON photodiode, tenth resistor, and fifth capacitor form a negative feedback circuit;

[0024] The negative input terminal of the integrated operational amplifier is connected to the cathode of the photodiode, the positive input terminal is connected to the anode of the diode and grounded, the output terminal is connected to the anode of the diode through the tenth resistor, the tenth resistor is also connected in parallel with the fifth capacitor, and the output terminal of the integrated operational amplifier is connected to the seventh input IO port of the processor.

[0025] Furthermore, the door handle comprises:

[0026] A base, a rotating shaft, a pull rod and an electromagnetic lock core, wherein the lock core and the rotating shaft are respectively arranged on both sides of the upper part of the base, a pull rod is connected to the rotating shaft, a pressure sensor and a fingerprint recognition module are installed on the pull rod, and the processor, the light switch relay and the door lock switch relay are arranged on the base.

[0027] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0028] The utility model sets a fingerprint recognition module and a pressure sensor on the pull rod of the door handle, and sets a processor. The processor can judge whether someone opens the door through the pressure sensor. The processor can also verify the identity information through the fingerprint recognition module, and turn on the door lock and the light when the verification is passed. When the fingerprint recognition module is set indoors, it is used to ensure the privacy of the bedroom on the one hand, and to prevent the inconvenience caused by accidentally touching the door handle to turn on the light on the other hand. The utility model also provides a specific pressure sensor circuit, through which it can more sensitively detect whether someone opens the door, which is convenient for the elderly to use. At the same time, for convenience and energy saving considerations, the utility model is installed with a photoelectric sensor. When the environment is brighter, the photoelectric sensor outputs a low level, and the light will not turn on when the door is opened. When the environment is darker, the photoelectric sensor outputs a high level, and the light can be turned on when the door is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural block diagram of a household elderly care smart door lock according to an embodiment of the utility model.

[0030] Figure 2 The figure is a schematic diagram of the processor circuit structure of an embodiment of the utility model.

[0031] Figure 3 The figure is a schematic diagram of the circuit structure of the fingerprint recognition module according to the embodiment of the present utility model.

[0032] Figure 4 This is a schematic diagram of the circuit structure of a pressure sensor according to an embodiment of the utility model.

[0033] Figure 5 The figure is a schematic diagram of the structure of the light switch relay circuit of an embodiment of the utility model.

[0034] Figure 6 This is a schematic diagram of the door lock switch relay circuit structure of an embodiment of the utility model.

[0035] Figure 7 It is a schematic structural diagram of a photoelectric sensor according to an embodiment of the utility model.

[0036] Figure 8 It is a schematic diagram of the physical structure of an embodiment of the utility model.

[0037] Among them, 1. base; 2. rotating shaft; 3. pull rod; 4. electromagnetic lock core; 5. fingerprint recognition module; 6. pressure sensor. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0040] Example 1

[0041] This embodiment provides a home elderly care smart door lock, such as Figure 1 and Figure 8 As shown, including:

[0042] The lock body is mounted on the door and has an electromagnetic lock cylinder;

[0043] Door handle: A fingerprint recognition module 5 and a pressure sensor 6 are sequentially arranged on the outer side of the door handle. The fingerprint recognition module 5 is used to obtain the user's fingerprint. The pressure sensor 6 is arranged close to the door frame to sense the pressure of the user's palm. When the user touches the fingerprint recognition module 5 and the pressure sensor 6 at the same time, the pressure sensor 6 is used to detect whether someone opens the door, and the fingerprint recognition module 5 verifies the received information.

[0044] A light switch relay electrically connected to the light;

[0045] A photoelectric sensor is provided on the lock body and is used to sense ambient light;

[0046] The door lock switch relay is arranged on the lock body and is electrically connected to the processor. The door lock switch relay is used to open the electromagnetic lock cylinder 4 after receiving the door opening command issued by the processor;

[0047] The processor is arranged in the lock body and is electrically connected to the fingerprint recognition module 5, the pressure sensor 6, the light switch relay, the electromagnetic lock cylinder and the photoelectric sensor.

[0048] The method of use of Example 1 is as follows: Figure 1 and Figure 8As shown, when opening the door, the user places the palm on the outside of the door handle, the thumb on the fingerprint recognition module 5, and the other four fingers on the inside of the door handle, so that the hand can not only perform fingerprint recognition while grasping the door handle, but also make the pressure sensor 6 feel the slight pressure of the user's palm. When the fingerprint recognition module 5 and the pressure sensor 6 are both verified, the processor controls the door lock switch relay to turn on the electromagnetic lock cylinder to release the locking signal, thereby facilitating the user to open the door. In addition, embodiment 1 detects the light condition of the house inside the door through the photoelectric sensor. When the light is lower than a certain threshold, the signal is sent to the processor. When the fingerprint recognition module 5 and the pressure sensor 6 are both verified, the processor controls the light switch relay to turn on the light.

[0049] In this embodiment 1, a fingerprint recognition module 5 and a pressure sensor 6 are arranged on the pull rod 3 of the door handle, and a processor is arranged on the base 1. The processor can determine whether someone opens the door through the pressure sensor 6. The processor can also verify the identity information through the fingerprint recognition module 5, and turn on the door lock and the light when the verification is passed. When the fingerprint recognition module 5 is arranged indoors, it is used to ensure the privacy of the bedroom on the one hand, and to prevent the inconvenience caused by accidentally touching the door handle to turn on the light on the other hand. And when the light is weak, the indoor light switch can be linked while opening the door lock, which not only makes it convenient for the elderly to open the door, but also ensures the safety of the elderly opening the door at night.

[0050] Example 2

[0051] A household elderly care smart door lock is described in detail below.

[0052] In Example 2, Figure 2 As shown, the processor uses a single-chip microcomputer of the MSP430G2553 model, the VCC pin of the processor is connected to a +3.3V power supply, and its RST pin, i.e., the reset pin, is connected to the VCC pin through a reset switch S1, i.e., a switch SW-PB and a resistor R1, wherein the reset switch S1 is connected in series with a capacitor C1, and one end of the reset switch S1 also leads to a branch connected to the RST pin, and the other end is grounded. The reset switch S1 controls the door lock to close again.

[0053] In Embodiment 2, the fingerprint recognition module 5 includes a fingerprint recognition panel, and the fingerprint recognition panel has a width greater than 2 cm and a length greater than 3 cm, which is convenient for users to place their hands.

[0054] like Figure 3As shown, the fingerprint recognition module 5 is a FPM383C chip, the V_TOUCH pin and VCC pin of the FPM383C module are connected to the +3.3V power supply, the TOUCHOUT pin of the FPM383C module is connected to the first input IO port P2.2 port of the processor, and the FPM383C module outputs the fingerprint information to the processor through the first input IO port P2.2 port. The TX and RX pins of the FPM383C module, i.e., the serial port interface, are connected to the processor through the second input IO port P2.1 port and the third input IO port P1.6 port respectively, so as to communicate with the processor through the serial port to realize user identity registration, deregistration, etc., such as binding and deletion of fingerprint information.

[0055] In embodiment 2, the pressure sensor 6 includes:

[0056] A first strain resistor, a second strain resistor, a third strain resistor and a fourth strain resistor, wherein the first strain resistor to the fourth strain resistor are connected to each other to form a differential half bridge;

[0057] An integrated operational amplifier, wherein the negative input terminal of the integrated operational amplifier is connected to the first end of the differential half bridge through a first strain resistor, the positive input terminal of the integrated operational amplifier is connected to the second end of the differential half bridge through a second strain resistor and a third strain resistor, the positive input terminal is also grounded through a fourth resistor, and the second end of the differential half bridge is also grounded through a first capacitor; the third and fourth ends of the differential half bridge are connected to a power supply, the power supply terminal of the integrated operational amplifier is connected to the power supply, the negative input terminal is also connected to the output terminal of the operational amplifier through a fifth resistor, and the output terminal is connected to the fourth input IO port P2.0 of the processor.

[0058] Specifically, the pressure sensor 6 includes first to fourth strain resistors, namely Ra, Rb, Rc and Rd, and the first strain resistor Ra to the fourth strain resistor Rd are connected to each other to form a differential half-bridge circuit structure, wherein the four strain resistors are all BHF1000-3HA model high-precision strain resistors. The pressure sensor 6 also includes an LF353 model integrated operational amplifier, which is used as a comparator to compare the strain voltages at both ends of the differential half-bridge and convert the strain voltages into input levels detectable by the processor.

[0059] like Figure 4As shown, the negative input terminal of the integrated operational amplifier is connected to the first end of the differential half bridge through the fourth resistor R4 with a resistance value of 470Ω, the positive input terminal of the integrated operational amplifier is connected to the second end of the differential half bridge through the sixth resistor R6 with a resistance value of 1kΩ and the seventh resistor R7 with a resistance value of 620Ω, the positive input terminal is also grounded through the eighth resistor R8 with a resistance value of 330kΩ, the second end of the differential board bridge is also grounded through the fourth capacitor C4, the third end and the fourth end of the differential half bridge are connected to the power supply, that is, the +5V power supply, and the power supply terminal of the integrated operational amplifier is connected to the power supply. The negative input terminal of the integrated operational amplifier is also connected to the output terminal of the amplifier through the fifth resistor R5 with a resistance value of 330kΩ, and the output terminal is connected to the P2.0 port of the processor.

[0060] In embodiment 2, the light switch relay comprises:

[0061] The first SR latch and the first electromagnetic relay, the S input end of the first SR latch is connected to the fifth input IO port P1.0 of the processor through the second resistor, the R input end of the first SR latch is grounded, the output end of the first SR latch is connected to the fourth port of the first electromagnetic relay, the fifth port of the first electromagnetic relay is grounded, the first port is connected to the live wire, the third port is connected to the electric lamp, the second port of the electric lamp is connected to the neutral wire, the live wire and the neutral wire are connected to the two ends of the first jumper wire as the plug of the electric lamp.

[0062] The light switch relay is used to latch the instructions output by the processor and convert them into the on / off state of the light in the room, thereby controlling the light in the room. The light switch relay module uses the first SR latch to latch the instructions output by the processor, that is, the high level that drives the light to turn on, so that when the hand is removed from the door handle, the on state of the light will be latched, so that the light in the room remains on, which is convenient for use. In addition, the light switch relay also uses the first electromagnetic relay to drive the household light with a larger working voltage through the smaller output voltage of the processor. See Figure 5 , is a schematic diagram of the structure of the light switch relay circuit of the utility model embodiment. Figure 5As shown, the first SR latch is composed of two NOR gates U2A and U3A connected crosswise, and the NOR gate model is 5962-8404101VCA. The 2nd end of the NOR gate U2A is connected to the P1.0 pin of the processor through the second resistor R2 with a resistance of 10kΩ, and the 3rd end is connected to the output end of the NOR gate U3A. The 3rd end of the NOR gate U3A is grounded, and the 2nd end is connected to the output end of the NOR gate U2A. The output end of the NOR gate 1 is used as the positive output end of the first SR latch, and is connected to the 4th end of the first electromagnetic relay through the third resistor R3 with a resistance of 10kΩ, and the 5th end of the first electromagnetic relay is grounded. Among them, the magnetic switch of the first electromagnetic relay is a single-pole double-throw switch, and its 1st end is connected to the home live wire, the 2nd end is not connected to the circuit, and the 3rd end is connected to one end of the electric lamp L1. The other end of the electric lamp is connected to the neutral wire. The live wire and the neutral wire are connected to the first jumper JP1 together, and used as the plug of the electric lamp. At the same time, the light switch relay provided in Example 2 includes a latch circuit for latching the switch state of the light, so that the light can be continuously turned on as long as the processor outputs a light-on signal with a pulse cycle.

[0063] In Example 2, the electromagnetic lock core controls locking and unlocking through the door lock switch relay.

[0064] Specifically, the door lock switch relay includes: a second electromagnetic relay, a second SR latch, and a second jumper. The S input terminal of the second SR latch is connected to the P1.1 port of the processor, the R input terminal is grounded, the fourth input terminal of the second electromagnetic relay is connected to the positive output terminal of the second SR latch, the fifth input terminal is grounded, the second port is not connected to the circuit, and the first and third ports are connected to the second jumper.

[0065] The door lock switch relay module is used to control the switch of the door lock through the command output by the processor. The door lock switch relay module includes: a second electromagnetic relay, a second SR latch, and a second jumper. Figure 6 , is a schematic diagram of the door lock switch relay circuit structure of an embodiment of the utility model. Figure 6 As shown, the second SR latch has the same structure as the above-mentioned second SR latch, and its S input terminal is connected to the P1.1 port of the processor through a ninth resistor R9 with a resistance of 10kΩ, and the R input terminal is grounded. The fourth input terminal of the second electromagnetic relay is connected to the positive output terminal of the second SR latch, the fifth input terminal is grounded, the second port is not connected to the circuit, and the first and third ports are connected to the second jumper.

[0066] In Example 2, Figure 7 As shown, the photoelectric sensor comprises:

[0067] LF353 integrated operational amplifier, UVTRON photodiode, tenth resistor, and fifth capacitor form a negative feedback circuit;

[0068] The negative input terminal of the integrated operational amplifier is connected to the cathode of the photodiode, the positive input terminal is connected to the anode of the diode and grounded, the output terminal is connected to the anode of the diode through a tenth resistor with a resistance of 10kΩ, the tenth resistor is also connected in parallel with a fifth capacitor with a capacitance of 0.01μF, and the output terminal of the integrated operational amplifier is connected to the P2.1 port of the processor.

[0069] In Example 2, the door handle should include: a base 1, a rotating shaft 2, a pull rod 3 and an electromagnetic lock core 4, see Figure 8 , is a schematic diagram of the physical structure of the embodiment of the utility model, the lock core and the shaft 2 are respectively placed on both sides of the upper side of the base 1, a pull rod 3 is connected to the shaft 2, and a pressure sensor 6 and a fingerprint recognition module 5 are installed on the pull rod 3. The processor and the output module are set on the base 1, and the output module includes the light switch relay and the door lock switch relay.

[0070] In Example 2, when the door handle is installed on the main door, the light in the living room can be turned on directly, which is convenient for the elderly to open the door at night, and the elderly do not have to grope in the dark to find the light switch after entering the door, thereby reducing the learning cost of the elderly and reducing the safety hazard of groping in the dark to turn on the light after returning home at night. When the door handle is installed on the bedroom door, the light in the corresponding bedroom can be turned on directly when the door is opened, which is convenient for the elderly to enter the room without having to look for the light switch, so that the elderly can also enjoy the convenience brought by the smart home.

[0071] In Example 2, when the user holds the door handle, the resistance of the strain resistor in the pressure sensor 6 changes, and the circuit generates a strain voltage, which is output by the integrated operational amplifier and input to the processor. After the P2.0 pin of the processor receives the voltage, it compares it with the preset voltage. When the difference is within the threshold, the input of the pin is determined to be 1. At the same time, the fingerprint recognition module 5 inputs the collected fingerprint verification information to the processor. After the processor verifies it in the same way, it outputs a control instruction. After the instruction is latched by the first SR latch in the light switch relay, it is converted into the switch state of the light and output to the first electromagnetic relay. After reaching the set threshold of the first electromagnetic relay, the magnetic switch is pulled down and the household light is turned on. At the same time, the control instruction is input to the second electromagnetic relay in the door lock switch relay. After reaching the set threshold of the second electromagnetic relay, the magnetic switch is pulled down and the door lock is opened. The user can also control the door lock to close again through the reset switch S1, but at this time the state of the SR latch is "hold", and the light is still turned on. At this time, the light can still be turned on and off by the external switch connected to the household circuit.

[0072] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0073] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A smart door lock for elderly care at home, characterized in that: include: A lock body is mounted on the door, and an electromagnetic lock cylinder is provided on the lock body and can move relative to the door; The door handle has a fingerprint recognition module and a pressure sensor disposed on its outer surface in sequence. The fingerprint recognition module is used to obtain the user's fingerprint. The pressure sensor is disposed near the door frame to sense the pressure of the user's palm. When the user touches the fingerprint recognition module and the pressure sensor at the same time, the pressure sensor is used to detect whether someone has opened the door. The fingerprint recognition module verifies the received information. A light switch relay electrically connected to the light; A photoelectric sensor is provided on the lock body and is used to sense ambient light; The door lock switch relay is arranged on the lock body and is electrically connected to the processor. The door lock switch relay is used to open the electromagnetic lock cylinder after receiving the door opening command issued by the processor; The processor is arranged in the lock body and is electrically connected to the fingerprint recognition module, the pressure sensor, the light switch relay, the door lock switch relay and the photoelectric sensor.

2. The home elderly care smart door lock according to claim 1, characterized in that: The processor adopts an MSP430G2553 microcontroller, the VCC pin of the processor is connected to a +3.3V power supply, and its RST pin is connected to the VCC pin through a reset switch S1 and a resistor R1, wherein the reset switch S1 is connected in series with a capacitor C1, one end of the reset switch S1 also leads to a branch connected to the RST pin, and the other end is grounded.

3. The home elderly care smart door lock according to claim 1 is characterized by: The fingerprint recognition module is an FPM383C chip. The V_TOUCH and VCC pins of the FPM383C module are connected to a +3.3V power supply. The TOUCHOUT pin of the FPM383C module is connected to the first input IO port of the processor. The FPM383C module inputs fingerprint information to the processor through the first input IO port. The TX and RX pins of the FPM383C module, i.e., the serial port interface, are connected to the processor through the second input IO port and the third input IO port respectively to communicate with the processor through the serial port.

4. The home elderly care smart door lock according to claim 1, characterized in that: Pressure sensors include: A first strain resistor, a second strain resistor, a third strain resistor and a fourth strain resistor, wherein the first strain resistor to the fourth strain resistor are connected to each other to form a differential half bridge; An integrated operational amplifier, wherein the negative input terminal of the integrated operational amplifier is connected to the first end of the differential half bridge through a first strain resistor, the positive input terminal of the integrated operational amplifier is connected to the second end of the differential half bridge through a second strain resistor and a third strain resistor, the positive input terminal is also grounded through a fourth resistor, and the second end of the differential half bridge is also grounded through a first capacitor; the third and fourth ends of the differential half bridge are connected to a power supply, the power supply terminal of the integrated operational amplifier is connected to the power supply, the negative input terminal is also connected to the output terminal of the operational amplifier through a fifth resistor, and the output terminal is connected to a fourth input IO port of the processor.

5. The home elderly care smart door lock according to claim 1, characterized in that: The light switch relay comprises: The first SR latch and the first electromagnetic relay, the S input end of the first SR latch is connected to the fifth input IO port of the processor through the second resistor, the R input end of the SR latch is grounded, the output end of the SR latch is connected to the fourth port of the electromagnetic relay, the fifth port of the first electromagnetic relay is grounded, the first port is connected to the live wire, the third port is connected to the electric lamp, the second port of the electric lamp is connected to the neutral wire, the live wire and the neutral wire are connected to the two ends of the first jumper wire as the plug of the electric lamp.

6. The home elderly care smart door lock according to claim 1, characterized in that: The door lock switch relay comprises: A second electromagnetic relay, a second SR latch and a second jumper, the S input end of the second SR latch is connected to the sixth input IO port of the processor, the R input end of the second SR latch is grounded, the fourth port of the second electromagnetic relay is connected to the positive output end of the second SR latch, the fifth port is grounded, the second port is not connected to the circuit, and the first and third ports are connected to the second jumper.

7. The home elderly care smart door lock according to claim 1, characterized in that: The photoelectric sensor comprises: LF353 integrated operational amplifier, UVTRON photodiode, tenth resistor, and fifth capacitor form a negative feedback circuit; The negative input terminal of the integrated operational amplifier is connected to the cathode of the photodiode, the positive input terminal is connected to the anode of the diode and grounded, the output terminal is connected to the anode of the diode through the tenth resistor, the tenth resistor is also connected in parallel with the fifth capacitor, and the output terminal of the integrated operational amplifier is connected to the seventh input IO port of the processor.

8. The home elderly care smart door lock according to claim 1, characterized in that: The door handle comprises: A base, a rotating shaft, a pull rod and an electromagnetic lock core, wherein the lock core and the rotating shaft are respectively arranged on both sides of the upper part of the base, a pull rod is connected to the rotating shaft, a pressure sensor and a fingerprint recognition module are installed on the pull rod, and the processor, the light switch relay and the door lock switch relay are arranged on the base.

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