Indoor self-powered door lock state wireless monitoring system

Abstract

The application provides a kind of indoor self-powered door lock state wireless monitoring system, system is by light energy acquisition module, door lock state monitoring module and wireless transceiver module constitute, wherein light energy acquisition module converts indoor weak light energy into electric energy, then electric energy is stored to energy storage unit;Door lock state monitoring module is composed of capacitive sensor and monitoring unit, when door is reversed, lock tongue enters between the two electrodes of capacitive sensor and causes the change of capacitance, monitoring unit converts capacitance into voltage, judges door lock state according to voltage size and sends to wireless transceiver module;Microprocessor receives detection instruction, closes energy supply switch unit, and energy storage unit supplies power to door lock state monitoring module and wireless transceiver module, door lock state monitoring module transmits door lock state to wireless transceiver module, wireless transceiver module sends door lock state and temperature and humidity to host computer, then disconnects energy supply switch unit, and door lock state monitoring module and wireless transceiver module enter sleep mode.

Description

Technical Field

[0001] This invention belongs to the field of sensors and smart homes, and specifically relates to a capacitive door lock status wireless monitoring system based on weak light energy in indoor environments. Background Technology

[0002] The Internet of Things (IoT) has profoundly changed people's production and lifestyles, and is of great significance to the development of modern society. As a result, wireless sensor network technology has emerged and is widely used in production and daily life, such as monitoring natural disasters like fires, floods, and hailstorms; monitoring factories, crops, ecological environments, and smart home systems; energy-saving solutions; and deep-sea, underground, and space exploration activities. Currently, most wireless sensor nodes are powered by traditional chemical batteries, but chemical batteries have inherent disadvantages such as short lifespan, poor environmental adaptability, and environmental pollution. When wireless sensing devices are installed in remote areas, battery maintenance becomes even more difficult.

[0003] With the booming development of the Internet of Things era, smart homes are becoming increasingly important in daily life, and most smart home applications are located indoors. Compared to the outdoors, the indoor environment, due to its lower energy density, limited energy sources, and strict size restrictions on energy harvesting devices, makes obtaining enough energy indoors to support the operation of wireless sensor nodes a challenging task.

[0004] In daily life, sometimes the latch on a door fails to extend after it is closed, resulting in an unlocked door. This significantly increases the safety risks to the home, especially for the elderly and those with memory problems. They may not remember whether they locked the door when leaving the house due to various factors, causing them anxiety. Furthermore, living far from home makes it inconvenient to return and check the door's lock status. Therefore, monitoring the door lock status via a mobile phone or other electronic device is essential.

[0005] Due to the low energy density and limited energy sources in indoor environments, selecting a suitable energy source to power smart home devices and wireless sensor nodes is crucial. In terms of energy density, indoor solar energy far surpasses the energy generated by GSM, Wi-Fi, and environmental noise, producing the most energy for the same device area. Regarding energy sustainability, outdoor solar energy can penetrate through windows during the day to power wireless sensor nodes, and indoor lighting at night can also power them, meeting the requirements of continuous energy generation and versatility. Therefore, collecting indoor solar energy to power smart home devices is the most reasonable approach.

[0006] Current door lock status monitoring systems suffer from several problems. First, some systems only monitor the door's closed state, lacking research on whether the door is deadbolted after closing. Second, most current systems still require DC power or batteries, necessitating periodic battery replacements. Third, most door lock status monitoring methods rely on contact with the latch to determine deadbolt status, which wears down monitoring components and shortens their lifespan. Finally, some systems require smart locks, necessitating replacement of the entire lock system, increasing user costs. Therefore, developing a non-contact method for monitoring door unlocking and deadbolting, while utilizing indoor energy for self-powering, holds significant research importance and practical value. Summary of the Invention

[0007] In view of this, the present invention proposes an indoor self-powered door lock status wireless monitoring system, which can monitor the status of the door through a non-contact capacitance detection method, and at the same time collect indoor light energy to power the door lock status wireless monitoring node, so as to achieve long-term stable and reliable operation indoors.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0009] An indoor self-powered door lock status wireless monitoring system comprises a light energy acquisition module, a door lock status monitoring module, and a wireless transceiver module. The light energy acquisition module includes a light energy acquisition unit, an energy management unit, an energy storage unit, and a power supply switch unit. The door lock status monitoring module includes a capacitive sensor and a monitoring unit. The wireless transceiver module includes a microprocessor, a radio frequency circuit, and a temperature and humidity sensor. The light energy acquisition unit converts weak indoor light energy into electrical energy, which is then stored in the energy storage unit by the energy management unit. Upon receiving a door lock status detection command, the microprocessor controls the power supply switch unit to close. The energy storage unit then supplies power to the door lock status monitoring module and the wireless transceiver module. The door lock status monitoring module transmits the door lock status to the wireless transceiver module, which then sends the door lock status and temperature and humidity data to a host computer via a gateway for display. Finally, the microprocessor controls the power supply switch unit to disconnect, and the door lock status monitoring module and the wireless transceiver module enter a sleep mode.

[0010] As a preferred embodiment of the present invention, the light energy harvesting unit includes a multi-panel parallel array of amorphous silicon photovoltaic cells for converting received indoor light energy into electrical energy.

[0011] In a preferred embodiment of the present invention, the energy management unit includes an energy input circuit and an output threshold setting circuit; the energy input circuit includes an input protection circuit; and the output threshold setting circuit includes a charging upper limit threshold and a discharging lower limit threshold for the indoor light energy acquisition module.

[0012] As a preferred embodiment of the present invention, the energy storage unit includes a power supply capacitor and a lithium battery; the charging and discharging management and load power supply strategy of the energy storage unit includes: when the load is in a dormant state, the lithium battery is charged through the power supply capacitor; when the load is in a working state, the power supply capacitor charges the lithium battery while simultaneously supplying power to the load through the lithium battery.

[0013] In a preferred embodiment of the present invention, the capacitive sensor is installed in the lock groove on the door frame. The two plates of the capacitive sensor are metal plates located on two opposite side walls of the lock groove. When the door is locked from the inside, the bolt enters between the two plates of the capacitive sensor in the lock groove, causing a change in the capacitance value. The bolt can be used to determine whether it has entered the lock groove, and thus whether the door is locked from the inside. The capacitive sensor is connected to the monitoring unit.

[0014] In a preferred embodiment of the present invention, the monitoring unit includes an oscillation circuit, a capacitor-to-voltage conversion circuit, and a peak detection circuit. The oscillation circuit is a self-excited oscillation type, generating a stable periodic sinusoidal oscillation signal, which is connected to the capacitor sensor to provide excitation for the capacitor sensor. The capacitor-to-voltage conversion circuit is connected to the capacitor sensor, acquiring the capacitance signal before and after the door lock is locked and converting it into a sinusoidal voltage signal. The peak detection circuit is connected to the capacitor-to-voltage conversion circuit, extracting the peak value of the sinusoidal voltage signal output by the capacitor-to-voltage conversion circuit, and outputting a peak voltage signal.

[0015] In a preferred embodiment of the present invention, the wireless transceiver module includes a microprocessor, a radio frequency circuit, and a temperature and humidity sensor. The transceiver strategy of the wireless transceiver module includes the following steps:

[0016] Step 1: After power-on, the microprocessor initializes its internal ADC;

[0017] Step 2: The microprocessor enters a low-power mode;

[0018] Step 3: Compare whether the host computer has issued a door lock status detection command. If a detection command has been issued, proceed to step 4; otherwise, proceed to step 2.

[0019] Step 4: The microprocessor controls the closing of the power supply switch unit, the monitoring unit is powered on, the temperature and humidity sensor is powered on and reset, and the radio frequency circuit is powered on and initialized;

[0020] Step 5: The monitoring unit outputs a peak voltage signal, and the temperature and humidity sensor acquires ambient temperature and humidity data;

[0021] Step 6: The microprocessor performs ADC conversion on the collected voltage values ​​and format conversion on the temperature and humidity data;

[0022] Step 7: Compare the voltage value after ADC conversion with the set threshold value;

[0023] Step 8: If the voltage value is greater than the threshold, the door "locked" status and temperature and humidity data will be transmitted to the host computer via the gateway for display; if the voltage value is less than the threshold, the door "unlocked" status and temperature and humidity data will be transmitted to the host computer via the gateway for display.

[0024] Step 9: The radio frequency circuit transmits the converted voltage value and temperature and humidity data;

[0025] Step 10: The microprocessor controls the disconnection of the power supply switch unit, and the temperature and humidity sensor, radio frequency circuit and monitoring unit enter sleep mode, and then execute step 2.

[0026] The host computer is an indoor intelligent control terminal. When the user needs to know the door lock status, a signal is sent from the mobile phone. After receiving the signal, the indoor intelligent control terminal sends information to measure the door lock status. After receiving the information, the indoor self-powered door lock status wireless monitoring system starts to detect the door lock status and sends the door lock status information. After receiving the door lock status information, the intelligent control terminal sends it to the mobile phone, so the user can know whether the door is locked.

[0027] Furthermore, considering that even if the lock on the door is deadbolted, but the bolt is not engaged in the lock groove on the door frame, the door is not truly locked. To more accurately determine the lock's status and further reduce the false alarm rate in lock status detection, a second capacitive sensor can be added to the lock to monitor whether it is deadbolted. When not deadbolted, part of the bolt is located between the two electrodes of the second capacitive sensor. When deadbolted, part of the bolt slides out from between the two electrodes of the second capacitive sensor, and the capacitance of the second capacitive sensor decreases. In the normal unlocked state, the aforementioned capacitive sensor on the door frame is in a low capacitance state, and the second capacitive sensor on the door is in a high capacitance state. When the lock on the door is deadbolted, but the bolt is not engaged in the lock groove on the door frame, both the capacitive sensor on the door frame and the second capacitive sensor on the door are in a low capacitance state. In this case, the lock is not effectively deadbolted and can be judged as unlocked. In the normal deadbolted state, the capacitive sensor on the door frame is in a high capacitance state, and the second capacitive sensor on the door is in a low capacitance state.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The indoor self-powered door lock status wireless monitoring system proposed in this invention uses a self-powered design to collect weak indoor light energy to power the door lock status wireless detection system. This breaks the limitation of traditional chemical energy sources such as dry batteries that need to be replaced regularly, thereby minimizing maintenance costs and having the advantage of long-term stable and reliable operation in indoor environments.

[0030] 2. The indoor self-powered door lock status wireless monitoring system proposed in this invention determines whether the door latch is in a deadbolt state by measuring the capacitance change caused by the door latch entering the two electrodes of the capacitive sensor. Compared with the current technical solution that only monitors the door's open or closed state, it has the advantage of higher security.

[0031] 3. The indoor self-powered door lock status wireless monitoring system proposed in this invention achieves non-contact detection of door lock status through sensor size optimization and parallel plate capacitors. Compared with current contact detection methods such as vibration method, it has the advantages of reducing wear of detection devices, extending service life, reducing misjudgment of monitoring results, and improving reliability.

[0032] 4. The indoor self-powered door lock status wireless monitoring system proposed in this invention monitors the door lock status by detecting the status of the latch. Compared with some current smart home door lock products, it eliminates the need to replace the entire lock set, reducing user costs.

[0033] 5. The indoor self-powered door lock status wireless monitoring system proposed in this invention has many advantages such as no need to replace batteries, long maintenance-free time, easy installation, low cost, and high reliability, and has broad application prospects in the field of smart homes. Attached Figure Description

[0034] Figure 1 This is a block diagram of the indoor self-powered door lock status wireless monitoring system of the present invention;

[0035] Figure 2 This is a block diagram illustrating the principle of the indoor light energy harvesting module in this invention.

[0036] Figure 3 This is a schematic diagram of an amorphous silicon photovoltaic cell in an embodiment of the present invention;

[0037] Figure 4 This is a circuit diagram of the energy management unit in an embodiment of the present invention;

[0038] Figure 5 This is a circuit diagram of the energy storage and power supply switching unit in an embodiment of the present invention;

[0039] Figure 6 This is a block diagram illustrating the principle of the door lock status monitoring module in this invention.

[0040] Figure 7 This is a scene diagram of a capacitive sensor monitoring the door lock status in an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of a capacitive sensor monitoring the door lock status in an embodiment of the present invention;

[0042] Figure 9 This is a circuit diagram of an embodiment of the present invention;

[0043] Figure 10 This is a circuit diagram of the capacitor-to-voltage conversion circuit in an embodiment of the present invention;

[0044] Figure 11 This is a peak detection circuit diagram in an embodiment of the present invention;

[0045] Figure 12 This is a flowchart illustrating the wireless transceiver module's transceiver strategy in an embodiment of the present invention. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0047] like Figure 1 As shown, an indoor self-powered door lock status wireless monitoring system consists of a light energy acquisition module 1, a door lock status monitoring module 2, and a wireless transceiver module 3. The light energy acquisition module 1's light energy acquisition unit 11 converts weak indoor light energy into electrical energy, which is then stored in an energy storage unit 13 via an energy management unit 12. The door lock status monitoring module 2 consists of a capacitive sensor 21 and a monitoring unit 22. The capacitive sensor 21 uses a parallel-plate capacitor, and the monitoring unit 22 converts the capacitance into voltage, determines the door lock status based on the voltage magnitude, and sends the result to the wireless transceiver module 3. After receiving the detection command, the microprocessor 31 closes the power supply switch unit 14, enabling the energy storage unit 13 to supply power to the door lock status monitoring module 2 and the wireless transceiver module 3. The door lock status monitoring module 2 transmits the door lock status to the wireless transceiver module 3, which then sends the door lock status and temperature / humidity data to a host computer. Finally, the power supply switch unit 14 is disconnected, and the door lock status monitoring module 2 and the wireless transceiver module 3 enter sleep mode.

[0048] like Figure 2 As shown, the light energy acquisition module 1 includes a light energy acquisition unit 11, an energy management unit 12, an energy storage unit 13, and a power supply switch unit 14. In use, the light energy acquisition unit 11 collects light energy through amorphous silicon photovoltaic cells and converts it into electrical energy. The energy management unit 12 maintains the maximum power output energy through maximum power point tracking control. The energy is then transferred to the energy storage element in the energy storage unit 13 for storage and supplies power to the load when the power supply switch unit 14 is turned on.

[0049] like Figure 3 As shown, the solar energy harvesting unit 11 is composed of a first photovoltaic cell 111, a second photovoltaic cell 112, and a third photovoltaic cell 113 connected in parallel and fixed in the photovoltaic cell casing 114. Alternatively, the solar energy harvesting unit 11 can also employ more photovoltaic cells connected in series and parallel.

[0050] like Figure 4 As shown, the energy management unit 12 is a circuit with S6AE102A as the main control chip, including an energy input circuit 121 and an output threshold setting circuit 122. The energy input circuit 121 includes a reverse protection diode D1 and a grounding capacitor C1. The reverse protection diode D1 is used to prevent the current from flowing in reverse to protect the light energy harvesting unit 11, and the grounding capacitor C1 is used to filter the signal to reduce the interference of low frequency signals on the energy input. The output threshold setting circuit consists of a first resistor R1, a second resistor R2, and a third resistor R3. By controlling the voltage division of the pins of the three resistors, the charging upper limit threshold and the discharging lower limit threshold of the indoor light energy harvesting module can be controlled.

[0051] like Figure 5 As shown, the energy storage unit 13 consists of a power supply capacitor CSTORE1 and a lithium battery management circuit 131. The power supply capacitor CSTORE1 is controlled by the output threshold setting circuit 122: when the voltage of the power supply capacitor CSTORE1 reaches the upper limit threshold for charging, it starts to supply power to the load; when the voltage of the power supply capacitor CSTORE1 drops to the lower limit threshold for discharging, it stops supplying power to the load. The lithium battery management circuit 131 is a circuit with the LTC4071 chip as the main control chip, including a lithium battery CSTORE2, a resistor R4, and a thermistor RT. The lithium battery CSTORE2 is an energy storage element. When the load is in sleep mode, the lithium battery CSTORE2 is in charging mode; when the load is in working mode, the lithium battery CSTORE2 supplies power to the load. The resistor R4 and the thermistor RT monitor the temperature of the lithium battery CSTORE2. When the temperature is too high, they will reduce the floating voltage of the lithium battery CSTORE2 to protect it. The power supply switch unit 14 is a circuit with the TPS70933 chip as the main control chip. The EN pin is controlled by the microprocessor 31: when the microprocessor 31 sets the EN pin to a high level, the power supply switch unit 14 is closed, and the energy storage unit 13 supplies power to the load; when the microprocessor 31 sets the EN pin to a low level, the power supply switch unit 14 is open, and the load enters sleep mode.

[0052] like Figure 6As shown, the door lock status monitoring module 2 includes a capacitance sensor 21 and a monitoring unit 22; the monitoring unit 22 includes an oscillation circuit 221, a capacitance-to-voltage conversion circuit 222 and a peak detection circuit 223; in use, the capacitance sensor 21 detects the capacitance of the door when it is unlocked and locked, and converts it through the monitoring unit 22.

[0053] like Figure 7 As shown, the capacitive sensor 21 is installed in the lock groove 231 on the door frame 23. The two plates of the capacitive sensor 21 are metal pieces located on the two opposite side walls of the lock groove 231. When the door 24 is locked, the bolt 241 enters between the two plates of the capacitive sensor 21 in the lock groove 231, causing a change in capacitance. Based on the capacitance value, it can be determined whether the bolt 241 has entered the lock groove 231, and thus whether the door 24 is locked.

[0054] like Figure 8 As shown, the capacitive sensor 21 includes a parallel plate capacitor 211 and a sensor housing 212. The plates are fixed to the inner wall of the sensor housing 212 with adhesive. When the door 24 is unlocked, the latch is completely outside the two electrodes of the parallel plate capacitor 211 of the capacitive sensor 21. The capacitance of the capacitive sensor 21 is:

[0055]

[0056] Where ε0 is the vacuum permittivity, ε r Let S be the dielectric constant of air, S be the area of ​​the plates facing each other in parallel plate capacitor 211, and d be the distance between the plates of parallel plate capacitor 211. When the door 24 is in the deadbolt state, the latch 241 is inserted between the two electrodes of the parallel plate capacitor 211 of the capacitance sensor 21. At this time, the capacitance of the capacitance sensor 21 is:

[0057]

[0058] Where d1 and d2 are the distances between the two plates of the parallel plate capacitor 211 and the latch 241. Since d1 + d2 is much smaller than d, C is much smaller than C'. The capacitance of the parallel plate capacitor 211 changes significantly before and after the latch 241 is inserted. Here, the midpoint between C and C' is used as the capacitance threshold for determining whether the latch 241 is inserted between the two electrodes of the parallel plate capacitor 211.

[0059] like Figure 9 As shown, the oscillation circuit 221 adopts a self-excited oscillation type. By constructing a feedback network circuit and utilizing the charging and discharging characteristics of the RC circuit, the output can automatically and continuously switch between high and low levels periodically at a certain time interval, generating a stable periodic sinusoidal oscillation signal to realize the oscillation of the circuit. It is connected to the capacitive sensor 21 to provide excitation.

[0060] like Figure 10 As shown, the capacitor-to-voltage conversion circuit 222 is connected to the capacitance sensor 21. It uses an operational amplifier-type capacitance measurement method to acquire the capacitance signal before and after the door lock is locked, and convert it into a sine wave voltage signal. When the door 24 is locked, the capacitance value output by the capacitance sensor 21 increases, and the amplitude of the voltage signal output by the capacitor-to-voltage conversion circuit 222 increases accordingly, and vice versa.

[0061] like Figure 11 As shown, the peak detection circuit 223 is connected to the capacitor-to-voltage conversion circuit 222. It extracts the peak value of the sinusoidal voltage signal output by the capacitor-to-voltage conversion circuit 222. During the positive half-cycle of the output sinusoidal wave, it ensures that the capacitor voltage can change synchronously according to the peak value of the input signal, thus playing the role of voltage tracking and outputting the peak voltage signal. The capacitor threshold value is converted into a voltage threshold value after passing through the capacitor-to-voltage conversion circuit 222 and the peak detection circuit 223. The door lock status can be distinguished by comparing the output voltage of the capacitor sensor 21 with the voltage threshold value.

[0062] like Figure 12 As shown, the transmit / receive strategy flow of the wireless transceiver module 3 includes the following steps:

[0063] Step 1: After power-on, the microprocessor 31 initializes its internal ADC;

[0064] Step 2: Microprocessor 31 enters low-power mode;

[0065] Step 3: Compare whether the host computer has issued a door lock status detection command. If a detection command has been issued, proceed to step 4; otherwise, proceed to step 2.

[0066] Step 4: The microprocessor 31 controls the closing of the power supply switch unit 14, the above-mentioned monitoring unit 22 is powered on, the temperature and humidity sensor 33 is powered on and reset, and the radio frequency circuit 32 is powered on and initialized.

[0067] Step 5: The monitoring unit 22 outputs a peak voltage signal, and the temperature and humidity sensor 33 acquires ambient temperature and humidity data;

[0068] Step 6: The microprocessor 31 performs ADC conversion on the collected voltage values ​​and format conversion on the temperature and humidity data;

[0069] Step 7: Compare the voltage value after ADC conversion with the set threshold value;

[0070] Step 8: If the voltage value is greater than the threshold, the "locked" status of door 24 and the temperature and humidity data are transmitted to the host computer via the gateway for display; if the voltage value is less than the threshold, the "unlocked" status of door 24 and the temperature and humidity data are transmitted to the host computer via the gateway for display.

[0071] Step 9: The radio frequency circuit 32 sends the converted voltage value and temperature and humidity data;

[0072] Step 10: The microprocessor 31 controls the disconnection of the power supply switch unit 14, and the temperature and humidity sensor 33, radio frequency circuit 32, and monitoring unit 22 enter sleep mode, and execute step 2.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A wireless monitoring system for the status of an indoor self-powered door lock, characterized in that: The system consists of a light energy acquisition module, a door lock status monitoring module, and a wireless transceiver module. The light energy acquisition module includes a light energy acquisition unit, an energy management unit, an energy storage unit, and a power supply switch unit. The door lock status monitoring module includes a capacitive sensor and a monitoring unit. The wireless transceiver module includes a microprocessor, a radio frequency circuit, and a temperature and humidity sensor. The light energy acquisition unit converts weak indoor light energy into electrical energy, which is then stored in the energy storage unit by the energy management unit. After receiving a door lock status detection command, the microprocessor controls the power supply switch unit to close. The energy storage unit then supplies power to the door lock status monitoring module and the wireless transceiver module. The door lock status monitoring module transmits the door lock status to the wireless transceiver module, which then sends the door lock status and temperature and humidity data to a host computer via a gateway for display. Finally, the microprocessor controls the power supply switch unit to disconnect, and the door lock status monitoring module and the wireless transceiver module enter sleep mode. The light energy acquisition unit includes multiple parallel amorphous silicon photovoltaic cell arrays used to convert received indoor light energy into electrical energy. The energy management unit includes an energy input circuit and an output threshold setting circuit; the energy input circuit includes an input protection circuit; the output threshold setting circuit includes a control over the upper charging threshold and the lower discharging threshold of the indoor light energy acquisition module. The energy storage unit includes a power supply capacitor and a lithium battery; The charging and discharging management and load power supply strategy of the energy storage unit includes: When the load is in a dormant state, the lithium battery is charged through the power supply capacitor; When the load is in operation, the power supply capacitor charges the lithium battery while simultaneously supplying power to the load through the lithium battery. The capacitive sensor is installed in the lock groove on the door frame. The two plates of the capacitive sensor are metal plates located on the two opposite side walls of the lock groove. When the door is locked from the inside, the bolt enters between the two plates of the capacitive sensor in the lock groove, causing a change in capacitance. The capacitance value can be used to determine whether the bolt has entered the lock groove, and thus whether the door is locked from the inside. The capacitive sensor is connected to the monitoring unit. The monitoring unit includes an oscillation circuit, a capacitor-to-voltage conversion circuit, and a peak detection circuit; The oscillation circuit adopts a self-excited oscillation type, which generates a stable periodic sinusoidal oscillation signal, and is connected to the capacitive sensor to provide excitation for the capacitive sensor. The capacitor-to-voltage conversion circuit is connected to the capacitor sensor, which acquires the capacitance signal before and after the door lock is deadbolted and converts it into a sine wave voltage signal. The peak detection circuit is connected to the capacitor-to-voltage conversion circuit, and extracts the peak value of the sinusoidal voltage signal output by the capacitor-to-voltage conversion circuit to output the peak voltage signal. The wireless transceiver module includes a microprocessor, radio frequency circuitry, and a temperature and humidity sensor. The transceiver strategy of the wireless transceiver module includes the following steps: Step 1: After power-on, the microprocessor initializes its internal ADC; Step 2: The microprocessor enters a low-power mode; Step 3: Compare whether the host computer has issued a door lock status detection command. If a detection command has been issued, proceed to step 4; otherwise, proceed to step 2. Step 4: The microprocessor controls the closing of the power supply switch unit, the monitoring unit is powered on, the temperature and humidity sensor is powered on and reset, and the radio frequency circuit is powered on and initialized; Step 5: The monitoring unit outputs a peak voltage signal, and the temperature and humidity sensor acquires ambient temperature and humidity data; Step 6: The microprocessor performs ADC conversion on the collected voltage values ​​and format conversion on the temperature and humidity data; Step 7: Compare the voltage value after ADC conversion with the set threshold value; Step 8: If the voltage value is greater than the threshold, the door "locked" status and temperature and humidity data will be transmitted to the host computer via the gateway for display; if the voltage value is less than the threshold, the door "unlocked" status and temperature and humidity data will be transmitted to the host computer via the gateway for display. Step 9: The radio frequency circuit transmits the converted voltage value and temperature and humidity data; Step 10: The microprocessor controls the disconnection of the power supply switch unit, and the temperature and humidity sensor, radio frequency circuit and monitoring unit enter sleep mode, and then execute step 2.

2. The indoor self-powered door lock status wireless monitoring system according to claim 1, characterized in that: To more accurately determine the door lock status, a second capacitive sensor is added to the door lock to monitor the position of the lock bolt. When the capacitive sensor on the door frame is in a low capacitance state and the second capacitive sensor on the door is in a high capacitance state, it is determined to be in an unlocked state. When both the capacitive sensor on the door frame and the second capacitive sensor on the door are in a low capacitance state, it is determined to be in an unlocked state. When the capacitive sensor on the door frame is in a high capacitance state and the second capacitive sensor on the door is in a low capacitance state, it is determined to be in a deadbolted state.

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