Doorbell anti-disassembly alarm circuit and doorbell

Abstract

The invention discloses a doorbell anti-disassembly alarm circuit and a doorbell, and relates to the technical field of doorbelles.The doorbell comprises a front shell, a circuit board and a backboard, the doorbell anti-disassembly alarm circuit is arranged on the circuit board, the circuit board is arranged on the backboard, the front shell covers the backboard, and the doorbell anti-disassembly alarm circuit comprises a detection module, a control module and a warning module. The detection module is used for detecting the relative position relation between the front shell and the back plate and outputting a corresponding detection signal; the control module is electrically connected with the detection module; the control module is used for outputting a warning control signal when determining that the relative position relation between the front shell and the back plate is changed according to the detection signal; the warning module is electrically connected with the control module, and the warning module is used for receiving the warning control signal and sending out a warning according to the warning control signal. The invention aims to improve the safety and reliability of the doorbell and reduce the risk that the doorbell is stolen or damaged, thereby ensuring the safety of a user family.

Description

Technical Field

[0001] The present invention relates to the technical field of doorbells, and particularly to a doorbell anti - disassembly alarm circuit and a doorbell. Background Art

[0002] With the progress of technology and the improvement of living quality, smart home devices have gradually become popular, and more and more families choose to install smart doorbells to enhance home security and convenience. Currently, most smart doorbells mainly rely on the physical strength of their shells to resist illegal disassembly. However, even if the shell is strong, it is still possible to be forcibly disassembled using tools. Once the shell is damaged and the internal circuit is exposed, the smart doorbell will lose its protection ability, thus further threatening home security. Summary of the Invention

[0003] The main purpose of the present invention is to propose a doorbell anti - disassembly alarm circuit and a doorbell, aiming to improve the safety and reliability of the doorbell, reduce the risk of the doorbell being stolen or damaged, and thus ensure the safety of the user's home.

[0004] To achieve the above object, the present invention proposes a doorbell anti - disassembly alarm circuit. The doorbell includes a front shell, a circuit board, and a back plate. The doorbell anti - disassembly alarm circuit is provided on the circuit board, the circuit board is provided on the back plate, and the front shell covers the back plate. The doorbell anti - disassembly alarm circuit includes:

[0005] A detection module, which is used to detect the relative position relationship between the front shell and the back plate and output a corresponding detection signal;

[0006] A control module, electrically connected to the detection module; the control module is used to output a warning control signal when it determines that the relative position relationship between the front shell and the back plate has changed according to the detection signal;

[0007] A warning module, electrically connected to the control module, and the warning module is used to receive the warning control signal and issue a warning according to the warning control signal.

[0008] In one embodiment, the detection module includes:

[0009] A transmitting module, provided on the front shell, and the transmitting module is used to output a transmitting signal;

[0010] A receiving module, provided on the circuit board and electrically connected to the control module. The receiving module is used to receive the transmitting signal, detect the relative position relationship between the front shell and the back plate according to the transmitting signal, and output a corresponding detection signal to the control module, so that the control module outputs a warning control signal when it determines that the relative position relationship between the front shell and the back plate has changed according to the detection signal.

[0011] In one embodiment, the transmitting module includes an infrared transmitting module, and the receiving module includes an infrared receiving module.

[0012] In one embodiment, the detection module includes a contact switch, and the front shell is provided with an abutting portion corresponding to the position of the contact switch. When the front shell covers the back plate, the contact switch contacts the abutting portion. The contact switch is used to detect the situation of its own contact with the abutting portion and output a corresponding detection signal to the control module, so that when the control module determines that the relative position relationship between the front shell and the back plate has changed according to the detection signal, it outputs a warning control signal.

[0013] In one embodiment, the detection module includes connecting contacts and a connecting contact head. The number of connecting contacts is two. The connecting contacts are arranged on the back plate, and the connecting contact head is arranged on the front shell. When the connecting contact head is inserted between the two connecting contacts, the two connecting contacts are electrically connected. The control module is used to output a warning control signal when determining that the relative position relationship between the front shell and the back plate has changed according to the electrical connection situation of the two connecting contacts.

[0014] In one embodiment, the doorbell anti-tampering alarm circuit further includes:

[0015] A camera module, electrically connected to the control module. The camera module is used to photograph a preset area and output a camera signal to the control module;

[0016] The control module is further used to output a warning control signal when determining that the portrait information in the preset area does not match the preset personnel information according to the camera signal, so that the warning module issues a warning according to the warning control signal.

[0017] In one embodiment, the control module includes:

[0018] A memory, used to store preset personnel information;

[0019] A controller, used to match the portrait information in the preset area corresponding to the camera signal with the preset personnel information, and output a warning control signal when determining that the portrait information in the preset area does not match the preset personnel information, so that the warning module issues a warning according to the warning control signal.

[0020] In one embodiment, the doorbell anti-tampering alarm circuit further includes:

[0021] A communication module. The communication module has a communication end communicatively connected to an external terminal. The communication module is electrically connected to the control module;

[0022] The control module is configured to send the camera signal to the external terminal via the communication module.

[0023] In an embodiment, the control module is further configured to send the camera signal to the external terminal when the portrait information within a preset area does not match the preset personnel information, and is further configured to output a warning control signal when an authorized instruction feedback from the external terminal is not received within a preset time period, so that the warning module issues a warning according to the warning control signal.

[0024] The present invention further provides a doorbell, which includes a front shell, a circuit board and a back plate. The circuit board is disposed on the back plate, and the front shell covers the back plate. The circuit board is provided with the doorbell anti-disassembly alarm circuit according to any one of the above.

[0025] The present invention provides a doorbell anti-disassembly alarm circuit. The doorbell includes a front shell, a circuit board and a back plate. The doorbell anti-disassembly alarm circuit is disposed on the circuit board. The circuit board is disposed on the back plate, and the front shell covers the back plate. The doorbell anti-disassembly alarm circuit includes a detection module, a control module and a warning module. The detection module is configured to detect the relative position relationship between the front shell and the back plate and output a corresponding detection signal. The control module is electrically connected to the detection module. The control module is configured to output a warning control signal when it is determined according to the detection signal that the relative position relationship between the front shell and the back plate has changed. The warning module is electrically connected to the control module, and the warning module is configured to receive the warning control signal and issue a warning according to the warning control signal.

[0026] In practical applications, when the doorbell is working properly, the detection module continuously detects the relative position relationship between the front shell and the back plate and outputs a corresponding detection signal to the control module. When the doorbell is disassembled, that is, when the front shell is separated from the back plate, resulting in a change in the relative position relationship between the front shell and the back plate, the control module will output a warning control signal to the warning module, so that the warning module issues a warning to prompt the user that the doorbell has been disassembled, there is a security risk, and the user needs to be vigilant and check in time, etc. When the control module determines according to the detection signal that the relative position relationship between the front shell and the back plate has not changed, the warning module does not receive the warning control signal and is in a non-working state. In this way, the safety and reliability of the doorbell are improved, the risk of the doorbell being stolen or damaged is reduced, and thus the safety of the user's home is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 It is a schematic diagram of a module of an embodiment of the doorbell anti-disassembly alarm circuit of the present invention;

[0029] Figure 2 It is a schematic diagram of a module of another embodiment of the doorbell anti-disassembly alarm circuit of the present invention;

[0030] Figure 3 It is a schematic diagram of a module of another embodiment of the doorbell anti-disassembly alarm circuit of the present invention;

[0031] Figure 4 It is a schematic diagram of a module of yet another embodiment of the doorbell anti-disassembly alarm circuit of the present invention;

[0032] Figure 5 It is a schematic diagram of a module of still another embodiment of the doorbell anti-disassembly alarm circuit of the present invention;

[0033] Figure 6 It is a schematic diagram of a module of another embodiment of the doorbell anti-disassembly alarm circuit of the present invention;

[0034] Figure 7 It is a schematic diagram of a module of another embodiment of the doorbell anti-disassembly alarm circuit of the present invention;

[0035] Figure 8 It is a schematic diagram of a module of yet another embodiment of the doorbell anti-disassembly alarm circuit of the present invention;

[0036] Figure 9 It is a specific circuit schematic diagram of an embodiment of the doorbell anti-disassembly alarm circuit of the present invention;

[0037] Figure 10 It is a specific circuit schematic diagram of another embodiment of the doorbell anti-disassembly alarm circuit of the present invention.

[0038] Explanation of the reference numerals in the drawings:

[0039] 10. Detection module; 20. Control module; 30. Warning module; 40. Camera module; 50. Communication module; 100. Front shell; 200. Circuit board; 300. Doorbell anti-disassembly alarm circuit; 400. Rear panel; 11. Transmitting module; 12. Receiving module; 01. Infrared transmitting module; 02. Infrared receiving module; 03. Magnet; 04. Magnetic induction sensor; 21. Memory; 22. Controller.

[0040] The realization, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] It should be noted that in this article, step codes such as S100 and S200 are used. The purpose is to more clearly and briefly express the corresponding content and do not constitute a substantial limitation in order. Those skilled in the art may execute S200 first and then S100 during specific implementation, etc., but these should all be within the protection scope of this application.

[0043] With the progress of technology and the improvement of the quality of life, smart home devices have gradually become popular, and more and more families choose to install smart doorbells to enhance home security and convenience. Currently, most smart doorbells mainly rely on the physical strength of their shells to resist illegal demolition. However, even if the shell is strong, it is still possible to be forcibly disassembled using tools. Once the shell is damaged and the internal circuit is exposed, the smart doorbell will lose its protective ability, further threatening home security.

[0044] For this reason, referring to Figure 1 and Figure 2 , the present invention proposes a doorbell anti-disassembly alarm circuit 300. The doorbell includes a front shell 100, a circuit board 200, and a back plate 400. The doorbell anti-disassembly alarm circuit 300 is provided on the circuit board 200. The circuit board 200 is provided on the back plate 400, and the front shell 100 covers the back plate 400. The doorbell anti-disassembly alarm circuit 300 includes:

[0045] A detection module 10, which is used to detect the relative position relationship between the front shell 100 and the back plate 400 and output a corresponding detection signal;

[0046] A control module 20, electrically connected to the detection module 10; the control module 20 is used to output a warning control signal when it is determined according to the detection signal that the relative position relationship between the front shell 100 and the back plate 400 has changed;

[0047] A warning module 30, electrically connected to the control module 20. The warning module 30 is used to receive the warning control signal and issue a warning according to the warning control signal.

[0048] In this embodiment, the control module 20 can be implemented by a main controller, such as an MCU, a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), a PLC, a SOC (System On Chip), etc. The detection module 10 can be implemented by an infrared sensor, a magnetic induction sensor 04, a touch switch, a spring, etc. The warning module 30 can be implemented by a buzzer, a speaker, etc. The front shell 100 is installed externally to protect the internal circuit board 200, and different appearances can also be designed according to the user's aesthetics. The circuit board 200 can be implemented by a printed circuit board 200 (PCB), a rigid-flex board, a flexible printed circuit 200 (FPC), etc., and includes circuit modules such as the detection module 10, the control module 20, and the warning module 30, which are responsible for processing signals and performing corresponding operations. The back plate 400 can be fixed to a wall, a door, or other supports, the circuit board 200 can be fixed to the back plate 400, and the front shell 100 is detachably connected to the back plate 400 through a connector. The connector includes a buckle, a screw, a magnetic part, etc.

[0049] When the doorbell is working properly, the detection module 10 detects the relative position relationship between the front shell 100 and the back plate 400 in real time and outputs a corresponding detection signal to the control module 20. Among them, the relative position relationship includes relative distance, relative angle, and whether there are changes such as displacement or rotation. Optionally, a touch switch can be used as the detection module 10 to detect whether the front shell 100 and the back plate 400 are in contact or separated to determine whether the relative position relationship between the front shell 100 and the back plate 400 has changed. Optionally, an ultrasonic sensor can also be used as the detection module 10. An ultrasonic sensor is installed on the back plate 400, and a reflecting surface is set at the corresponding position of the front shell 100. By controlling the ultrasonic sensor to emit ultrasonic waves and receive the reflected waves, the distance between the front shell 100 and the back plate 400 is measured, and then it is determined whether the relative position relationship between the front shell 100 and the back plate 400 has changed. Optionally, weight sensors such as piezoelectric sensors and load sensors can also be used as the detection module 10. The load sensor is installed on the back plate 400 to ensure that it can bear the weight of the front shell 100. Compared with the weight when the front shell 100 covers the back plate 400, when the doorbell housing is disassembled from the back plate 400, the weight detected by the load sensor will decrease, and based on this, it can be determined whether the relative position relationship between the front shell 100 and the back plate 400 has changed.

[0050] When the doorbell is disassembled or moved, that is, when the front shell 100 is separated from the back plate 400, resulting in a change in the relative positional relationship between the front shell 100 and the back plate 400, the control module 20 will output a warning control signal to the warning module 30, so that the warning module 30 issues a warning, prompting the user that the doorbell has been disassembled or moved, there is a safety risk, and it is necessary to be vigilant and check in time, etc. When the control module 20 determines that the relative positional relationship between the front shell 100 and the back plate 400 has not changed according to the detection signal, the warning module 30 does not receive the warning control signal and is in a non-working state, and will not trigger a warning action.

[0051] In practical applications, the doorbell anti-disassembly alarm circuit 300 of the present invention realizes the anti-disassembly alarm function of the doorbell, improves the safety and reliability of the doorbell, reduces the risk of the doorbell being stolen or damaged, and thus ensures the safety of the user's home.

[0052] In one embodiment, refer to Figure 3 , the detection module 10 includes:

[0053] The transmitting module 11 is disposed on the front shell 100, and the transmitting module 11 is used to output a transmitting signal;

[0054] The receiving module 12 is disposed on the circuit board 200 and is electrically connected to the control module 20. The receiving module 12 is used to receive the transmitting signal, detect the relative positional relationship between the front shell 100 and the back plate 400 according to the transmitting signal, and output a corresponding detection signal to the control module 20, so that when the control module 20 determines that the relative positional relationship between the front shell 100 and the back plate 400 has changed according to the detection signal, it outputs a warning control signal.

[0055] Optionally, the transmitting module 11 can be implemented by a laser transmitting module, and the receiving module 12 can be implemented by a laser receiving module. Optionally, the transmitting module 11 includes an infrared transmitting module 01, and the receiving module 12 includes an infrared receiving module 02.

[0056] Taking the transmitting module 11 as the infrared transmitting module 01 and the receiving module 12 as the infrared receiving module 02 as an example for illustration, as Figure 4 and Figure 9As shown in the figure, the infrared emission module 01 includes an IR drive signal and multiple IRLED lights. When the doorbell is working properly, the control module 20 controls the PWM port to output a PWM signal with a preset duty cycle to the IR drive chip to control the IR drive chip to drive IRLED1, IRLED1... IRLEDn to emit light. The infrared reception module 02 (IR Sensor) receives the corresponding infrared radiation flux and outputs the corresponding infrared detection signal to the control module 20, so that the control module 20 determines whether the relative position relationship between the front shell 100 and the back plate 400 has changed according to the infrared detection signal, and controls the warning module 30 to issue a warning when it is determined that the relative position relationship has changed.

[0057] It can be understood that in the normal working state of the doorbell, the infrared light emitted by the infrared emission module 01 will irradiate surrounding objects (such as walls) and then be reflected back to the infrared reception module 02. If the doorbell is disassembled or moved, the original reflection path will be damaged, resulting in the infrared light being unable to effectively return to the reception module 12. For example, when the position or angle between the front shell 100 and the back plate 400 changes, the incident angle and reflection angle between the infrared emission module 01 and the reflection surface will both change. According to the law of reflection, the incident angle is equal to the reflection angle, which means that if the angle shifts, the infrared light may deviate from the original reflection path, resulting in a decrease in the received infrared radiation flux. If the front shell 100 is disassembled from the back plate 400, the distance between it and the reflection surface will also change. As the distance increases, the intensity of the infrared light will decrease according to the inverse square law. Therefore, the change in distance will also result in a decrease in the received infrared radiation flux. Therefore, in this embodiment, when the doorbell is disassembled or moved, that is, when the relative position relationship between the front shell 100 and the back plate 400 changes, the infrared radiation flux received by the infrared reception module 02 will decrease. Assuming that the doorbell is normally installed and the front shell 100 and the back plate 400 are fixed, the infrared radiation flux is a preset threshold A, which is set in advance by the R & D personnel. When the control module 20 determines that the infrared radiation flux is greater than or equal to A according to the infrared detection signal, it will not output a warning control signal to start the warning module 30 to work, and no warning action will occur. When the doorbell is moved or disassembled, when the control module 20 determines that the infrared radiation flux is less than A according to the infrared detection signal, it outputs a warning control signal to start the warning module 30 to work and a warning action occurs to prompt the user.

[0058] In practical applications, using an infrared sensor as the detection module 10 has a low cost and is easy to implement. At the same time, the switching speed of the infrared emission module 01 (LED lamp) is very fast, generally at the nanosecond level (ns), so the time delay of its emitted signal can be ignored. The optical signal transmission rate is fast, so the infrared sensor has a fast response speed, which can improve the problems of large detection signal delay and inability to quickly respond to anti-disassembly alarms in related technologies, and further improve the reliability and safety of the doorbell.

[0059] In another embodiment, the detection module 10 includes a contact switch, and the front shell 100 is provided with an abutting portion corresponding to the position of the contact switch. When the front shell 100 covers the back plate 400, the contact switch contacts the abutting portion. The contact switch is used to detect the contact situation between itself and the abutting portion, and output a corresponding detection signal to the control module 20, so that when the control module 20 determines that the relative position relationship between the front shell 100 and the back plate 400 has changed according to the detection signal, it outputs a warning control signal.

[0060] In this embodiment, the contact switch includes contact contacts, which are metal components inside the contact switch. These components contact each other to form an electrical connection when the switch is closed; they separate when the switch is open, disconnecting the electrical connection. The abutting portion refers to the part that contacts the external mechanical part of the contact switch, usually a protrusion or a pressing block, which is used to trigger the action of the contact switch. It can be installed on the outer shell and press the contact switch tightly when the doorbell is normally installed, so that it is closed. Optionally, the contact switch is installed at a suitable position on the doorbell back plate 400 to ensure that it can be pressed and closed by the abutting portion on the outer shell when the doorbell is normally installed. Design a small protrusion or pressing block (abutting portion) on the outer shell to ensure that it can accurately press the contact switch when the doorbell is normally installed. Among them, the abutting portion can be made of plastic or metal material to ensure that it has sufficient hardness and durability.

[0061] As Figure 10 shown, one end of the contact switch S1 is grounded, and the other end of the contact switch is connected to a GPIO pin (such as GPIO1) of the control module 20. A pull-up resistor R3 is added between the GPIO pin and VCC. This can be achieved by an external resistor or by using the internal pull-up function of the control module 20 (such as an MCU). In this way, when the doorbell is not disassembled or moved, the contact switch contacts the abutting portion and is in a closed state. The GPIO pin of the control module 20 receives a low-level signal, and the warning module 30 does not perform a warning action. When the doorbell is disassembled or moved, the relative position relationship between the outer shell and the back plate 400 changes, the contact switch separates from the abutting portion, that is, the contact situation between the contact contacts of the contact switch and the abutting portion changes, the contact switch disconnects, the GPIO pin of the control module 20 receives a high-level signal, and outputs a warning control signal to the warning module 30 to make it perform a warning action.

[0062] It should be noted that, in order to improve reliability, multiple contact switches can be installed at different parts of the doorbell and connected in series. As long as one contact switch is disconnected, it can trigger the warning module 30 to issue a warning to prompt the user.

[0063] The mechanical characteristics of the contact switch determine that it has a very fast response speed and can achieve real-time detection. By installing multiple contact switches in different parts of the doorbell in series, as long as one contact switch is disconnected, the alarm can be triggered, improving the reliability of the anti-tampering alarm circuit 300 of the doorbell. In addition, the cost of the contact switch is low, and complex circuit design and signal processing are not required, reducing the overall cost. The contact switch is small in size and occupies little space, thereby improving the integration of the doorbell.

[0064] In one embodiment, the detection module 10 includes a connection contact piece and a connection contact head. The number of the connection contact pieces is two. The connection contact pieces are arranged on the back plate 400, and the connection contact head is arranged on the front shell 100. When the connection contact head is inserted between the two connection contact pieces, the two connection contact pieces are electrically connected. The control module 20 is configured to output a warning control signal when determining that the relative position relationship between the front shell 100 and the back plate 400 has changed according to the electrical connection condition of the two connection contact pieces.

[0065] In this embodiment, the connection contact piece is a metal piece installed on the back plate 400 for forming electrical contact; the connection contact head is a metal protrusion or pin installed on the front shell 100 for inserting between the two connection contact pieces to make them electrically connected. The number of the connection contact pieces is two, which are respectively marked as contact piece M and contact piece N. The contact piece M and the contact piece N can be respectively installed at appropriate positions on the doorbell back plate 400 to ensure that when the front shell 100 is correctly installed, the connection contact head can be inserted and connect the two contact pieces. At the same time, screws, welding or other methods are used to ensure that the contact pieces are firmly installed to avoid displacement caused by vibration or external force. After the outer shell and the back plate 400 are installed in place, the connection contact head is inserted between the two connection contact pieces and the two connection contact pieces are connected. At this time, no warning action will occur. When the outer shell moves away from the back plate 400 under the action of an external force, the connection contact head disengages from between the two connection contact pieces, and the two connection contact pieces are disconnected. The control module 20 controls the warning module 30 to issue an alarm.

[0066] Due to the relatively simple and direct design of the connection contact head and the contact piece, it is not affected by factors such as ambient light and temperature, and has high accuracy. In addition, due to the simple structure, the maintenance and replacement of the mechanical switch are also relatively convenient, reducing the cost and difficulty of later maintenance.

[0067] In another embodiment, refer to Figure 5, the detection module 10 includes a magnetic induction sensor 04, and a magnet 03 is provided at a position corresponding to the magnetic induction sensor 04 on the front case 100. The magnetic induction sensor 04 is used to detect the magnetic field intensity of the magnet 03 and output a corresponding detection signal to the control module 20, so that when the control module 20 determines that the relative position relationship between the front case 100 and the back plate 400 has changed according to the detection signal, it outputs a warning control signal.

[0068] In this embodiment, the magnetic induction sensor 04 can be implemented by a Hall sensor, a magnetoresistive sensor, etc. The magnet 03 can be implemented by a magnet. The magnet is installed at a suitable position on the front case 100 to ensure that it can be close to the magnetic induction sensor 04 on the back plate 400 when the doorbell is normally installed. When the doorbell is normally installed, that is, when the front case 100 is correctly installed on the back plate 400, the magnetic field intensity detected by the magnetic induction sensor 04 is greater than or equal to the preset intensity value B. When the front case 100 is detached from the back plate 400, the relative position relationship between the front case 100 and the back plate 400 changes, and the magnetic field intensity detected by the magnetic induction sensor 04 is less than the preset intensity value B. Among them, the preset intensity value is set in advance by R & D personnel. In this way, when the control module 20 determines according to the detection signal output by the magnetic induction sensor 04 that the magnetic field intensity is less than the preset intensity value B, it means that the relative position relationship between the front case 100 and the back plate 400 has changed, and a warning control signal is output to the warning module 30 to control the warning module 30 to issue a warning.

[0069] By using the magnetic induction sensor 04 and the magnet 03 to detect the relative position relationship between the front case 100 and the back plate 400, the relative position change between the front case 100 and the back plate 400 can be effectively detected, ensuring that illegal disassembly behaviors can be discovered and responded to in time, improving the reliability of the operation of the doorbell anti-disassembly alarm circuit 300, and thus ensuring the personal and property safety of the family.

[0070] In another embodiment, refer to Figure 6 , the doorbell anti-disassembly alarm circuit 300 further includes:

[0071] A camera module 40, electrically connected to the control module 20, and the camera module 40 is used to photograph a preset area and output a camera signal to the control module 20;

[0072] The control module 20 is further configured to output a warning control signal when the person image information in the preset area does not match the preset person information according to the camera signal, so that the warning module 30 issues a warning according to the warning control signal.

[0073] In this embodiment, the camera module 40 can be implemented by a camera device with the ability to perform image acquisition and processing tasks. Optionally, refer toFigure 7 , the control module 20 includes a memory 21 and a controller 22. Among them, the memory 21 can be implemented by a Flash memory 21 (Flash Memory), an EEPROM (Electrically Erasable Programmable Read-Only Memory 21), a RAM (Random Access Memory 21), etc. The controller 22 is implemented by the above-mentioned main controller. The memory 21 is used to store preset personnel information; the controller 22 is used to match the portrait information in the preset area corresponding to the camera signal with the preset personnel information, and when it is determined that the portrait information in the preset area does not match the preset personnel information, output a warning control signal, so that the warning module 30 issues a warning according to the warning control signal. The preset area is set in advance by R & D personnel or users to ensure that the personnel outside the door can be accurately and clearly photographed.

[0074] It should be noted that the doorbell anti-tampering alarm circuit 300 further includes a power supply module for providing a power supply voltage for each functional module on the circuit board 200. The functional modules include, but are not limited to, the detection module 10, the control module 20, the warning module 30, the camera module 40, etc., to ensure the normal operation of the doorbell. The power supply module can be implemented by an LDO (voltage regulator) or a boost module / buck module, etc. When the doorbell is working normally, the camera module 40 can take pictures or record videos of the preset area and send the camera signal to the control module 20. The control module 20 can determine the portrait information in the preset area according to the camera signal and match it with the preset personnel information stored in the memory 21. When the control module 20 determines that the portrait information in the preset area does not match the preset personnel information, it outputs a warning control signal, so that the warning module 30 issues a warning according to the warning control signal. When the control module 20 determines that the portrait information in the preset area matches the preset personnel information, the warning module 30 does not perform a warning action. In order to reduce power consumption and increase the usage time of the doorbell, combined with the content of the above embodiment, when the control module 20 determines that the relative position relationship between the housing and the back plate 400 has changed according to the detection signal output by the detection module 10, it outputs a camera control signal to the camera module 40 to control the camera module 40 to take pictures or record videos of the preset area. When the control module 20 determines that the relative position relationship between the housing and the back plate 400 has not changed according to the detection signal output by the detection module 10, the camera module 40 does not work and is in a low-power state.

[0075] In this embodiment, the user can capture the facial information of family members in advance and store it in the memory 21. Optionally, the user can capture it through the camera module 40 of the doorbell, and the control module 20 stores it in the memory 21, so as to match the subsequent captured portrait information with the facial information of family members, and thus determine whether to trigger a warning. Optionally, the doorbell anti-tamper alarm circuit 300 further includes a communication module 50 for communicating with an external terminal. The user can collect the facial information of family members in advance through the external terminal and upload it to the control module 20 through the communication module 50, so that the control module 20 stores it in the memory 21 for subsequent comparison.

[0076] When the doorbell is disassembled or moved, the control module 20 determines that the relative position relationship between the front shell 100 and the back plate 400 has changed according to the detection signal, and outputs a camera control signal to control the camera module 40 to capture or record a preset area, which can be specifically set according to the actual needs of the user. After the camera module 40 finishes shooting, it outputs a corresponding camera signal to the control module 20, so that the control module 20 matches it with the preset personnel information stored in advance in the memory 21, and if the match fails, the control warning module 30 gives a warning. In actual applications, the user has the authorization right to preset the list of authorized personnel and save the facial features or other identification information of these personnel in the memory 21. When a person on the authorized personnel list accidentally touches the doorbell and causes a change in the relative position relationship between the outer shell and the back plate 400, the warning action will not be triggered, reducing unnecessary alarms. In this way, the possibility of the warning module 30 being accidentally triggered is reduced, improving the user experience.

[0077] In another embodiment, refer to Figure 8 , the doorbell anti-tamper alarm circuit 300 further includes:

[0078] A communication module 50, the communication module 50 has a communication end for communicating with an external terminal, and the communication module 50 is electrically connected to the control module 20;

[0079] The control module 20 is configured to send the camera signal to the external terminal through the communication module 50.

[0080] In this embodiment, the communication module 50 can be implemented by a wireless communication module, such as a WIFI module, a 4G / 5G module, a Bluetooth module, etc., or by a wired communication module, such as a CAN communication module, a LIN communication module, an RS485 communication module. The external terminal includes a mobile phone, a tablet, a computer, etc.

[0081] Combined with the content of the above embodiments, when the control module 20 determines that the relative position relationship between the front shell 100 and the back plate 400 has changed according to the detection signal, it outputs a camera control signal to control the camera module 40 to take pictures or record videos of a preset area, and receives the camera signal to determine the portrait information corresponding to the camera signal and matches it with the preset personnel information. If the matching fails, an alarm action is taken. To further improve reliability and security, in this embodiment, when the control module 20 determines that the matching fails, it indicates that the person outside the door is not authorized, and outputs the camera signal to an external terminal through the communication module 50 to prompt the user to view the situation outside the door through the external terminal.

[0082] In this way, it can prevent the user from not being able to discover dangers in time due to not hearing the warning sound of the warning module 30. That is, the anti-tampering alarm circuit will not only trigger an alarm locally using the warning module 30, but also send images or videos to the user's external terminal through the communication module 50, ensuring that the user can timely understand the situation even when not at home, so as to take further measures as needed, enabling the user to timely discover and respond to potential security threats, and further improving user safety and property safety.

[0083] Optionally, the control module 20 is further configured to send the camera signal to an external terminal when determining that the portrait information in the preset area does not match the preset personnel information, and is further configured to output a warning control signal when no authorization instruction feedback from the external terminal is received within a preset time period, so that the warning module 30 issues a warning according to the warning control signal.

[0084] Combined with the content of the above embodiments, the user can not only view the situation outside the door through the external terminal, but also can still timely discover potential dangers when no one is at home or when the indoor environment is noisy and the warning prompt is not heard. The user can also authorize the person outside the door through relevant software or web pages of the external terminal. When the control module 20 determines that the portrait information in the preset area does not match the preset personnel information, it sends the camera signal to the external terminal. The user determines the situation outside the door through the external terminal. When discovering suspicious or strange personnel, corresponding measures can be taken to reduce the security risk. When discovering non-strange personnel, an authorization instruction can be sent through the external terminal. When the control module 20 receives the authorization instruction, it will not output a warning control signal, and the warning module 30 will not work. When the control module 20 does not receive the authorization instruction feedback from the external terminal within a preset time period, it outputs a warning control signal to make the warning module 30 issue a warning. In this way, when the user is in a sleeping state or a busy state and does not view the external terminal in time, the warning module 30 prompts the user, or warns suspicious personnel to terminate improper behavior in time. Among them, the preset time period is set in advance by R & D personnel.

[0085] In practical applications, users can authorize personnel outside the door through relevant software or web pages of external terminals, which improves the flexibility of the doorbell and thus enhances the user experience.

[0086] The principle of the present invention will be specifically described below in conjunction with the attached Figure 9 drawings.

[0087] In this embodiment, the doorbell further includes a button module, which is used to output a corresponding trigger signal to the control module 20 when triggered by the user, so that the control module 20 controls the warning module 30 to work according to the trigger signal. In this way, when an outsider comes, the corresponding button on the doorbell can be pressed, so that the warning module 30 performs a warning action, such as a sound prompt or a light prompt, to notify the indoor user to check and decide whether to open the door according to the actual situation.

[0088] Taking the detection module 10 including an infrared emission module 01 and an infrared reception module 02, and the warning module 30 including a speaker power amplifier and a speaker as an example for illustration. Among them, the speaker power amplifier is used to drive the speaker to work according to the warning control signal output by the control module 20 to emit a warning sound.

[0089] In this embodiment, the control module 20 includes:

[0090] A controller 22, which is used to output a corresponding switch control signal according to the detection signal;

[0091] A switch module, which is electrically connected to the controller 22 and the warning module 30 respectively;

[0092] The switch module is used to conduct / disconnect according to the switch control signal to output or stop outputting the warning control signal to the warning module 30.

[0093] Among them, the switch module includes:

[0094] A pull-up resistor, the first end of which is used to connect to the supply voltage, and the second end of which is electrically connected to the warning module 30;

[0095] A pull-down resistor, the first end of which is used to connect to the ground;

[0096] A switching tube, the first end of which is electrically connected to the second end of the pull-up resistor, the second end of which is electrically connected to the control module 20 and the second end of the pull-down resistor respectively, and the third end of which is used to connect to the ground;

[0097] The switching tube is used to conduct / disconnect according to the switch control signal to output or stop outputting the warning control signal to the warning module 30.

[0098] For exampleFigure 9 As shown, R1 is a pull-up resistor, R2 is a pull-down resistor, and the N MOS transistor Q is a switching transistor. The first end of the pull-up resistor R1 is used to connect to the supply voltage of 1.8V, and 1.8V can be provided by the power supply module described in the above embodiments.

[0099] When the doorbell works normally, the power supply module supplies power normally. The control module 20 controls the PWM port to output a PWM control signal with a preset duty cycle to the infrared emission module 01, that is, outputs the PWM control signal to the IR driver chip, so that the IR driver chip drives each LED lamp to work, such as IRLED1, IRLED1... IRLEDn to emit light. In this way, the infrared reception module 02 (IRSensor) on the circuit board 200 will receive the corresponding infrared radiation flux. When the doorbell is not disassembled or moved, that is, when the relative position relationship between the housing and the back plate 400 does not change, when the infrared radiation flux received by the IRSensor is greater than or equal to the preset threshold A, a high-level signal is output. The control module 20 detects that the GPIO1 pin is at a high level (such as 1.8V), and controls GPIO2 to output a low-level signal to the gate of the NMOS transistor, so that Q is disconnected, and the IRQ pins of the camera module 40 and the speaker power amplifier receive a high-level signal (1.8V), and no alarm action occurs. When the doorbell is disassembled or moved, the infrared radiation flux received by the IRSensor is less than A, and a low-level signal is output. After the control module 20 detects that GPIO1 is a low-level signal, it controls GPIO2 to output a high-level signal (such as 1.8V) to the gate of the NMOS transistor, so that Q is turned on, and then the levels of the IRQ pins of the camera module 40 and the speaker power amplifier become low level (0V). The camera module 40 starts taking pictures or videos and transmits them to the control module 20 through the CIS protocol. The communication module 50 (such as a WIFI module) can upload the pictures or videos to the server or an external terminal. At the same time, the control module 20 can output an audio signal to the speaker power amplifier through the I2S protocol to drive the speaker to emit an alarm sound.

[0100] By integrating a key module, a detection module 10, a warning module 30, a communication module 50, a camera module 40, etc., the doorbell can trigger an alarm in various situations, ensuring that users can promptly discover and respond to potential security threats. In this way, the security and reliability of the doorbell are improved, the risk of the doorbell being stolen or damaged is reduced, and thus the safety of the user's home is guaranteed.

[0101] The present invention also proposes a doorbell, which includes a front shell 100, a circuit board 200, and a back plate 400. The circuit board 200 is disposed on the back plate 400, the front shell 100 covers the back plate 400, and the circuit board 200 is provided with the doorbell anti-disassembly alarm circuit 300 described in any one of the above.

[0102] Optionally, the front shell 100 and the back plate 400 can be installed in a snap-fit manner. For example, the front shell 100 is connected to the back plate 400 through multiple snaps without using screws. It is convenient for installation and disassembly and is suitable for doorbell devices with replaceable batteries. Optionally, a screw fixation method can also be adopted, where the front shell 100 is fixed to the back plate 400 with screws, such as using cross screws or hex socket screws. The structure is firm and suitable for doorbells that are used for a long time and do not need to be disassembled frequently. Optionally, the front shell 100 and the back plate 400 can also be installed in a magnetic attraction manner, such as being attracted together by a strong magnet between the front shell 100 and the back plate 400. In this way, the installation and disassembly are convenient, and the appearance is simple and beautiful.

[0103] It should be noted that since the doorbell of the present invention is based on the above-mentioned doorbell anti-disassembly alarm circuit 300, the embodiments of the doorbell of the present invention include all the technical solutions of all the embodiments of the above-mentioned doorbell anti-disassembly alarm circuit 300, and the achieved technical effects are also exactly the same, which will not be elaborated here.

[0104] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A doorbell anti-disassembly alarm circuit, characterized in that, The doorbell includes a front shell, a circuit board and a back plate. The anti-tamper alarm circuit of the doorbell is provided on the circuit board. The circuit board is provided on the back plate, and the front shell covers the back plate. The anti-tamper alarm circuit of the doorbell includes: A detection module for detecting the relative position relationship between the front shell and the back plate and outputting a corresponding detection signal; A control module electrically connected to the detection module. The control module is configured to output a warning control signal when it determines that the relative position relationship between the front shell and the back plate has changed according to the detection signal; A warning module electrically connected to the control module. The warning module is configured to receive the warning control signal and issue a warning according to the warning control signal.

2. The doorbell anti-disassembly alarm circuit according to claim 1, characterized in that, The detection module includes: A transmitting module provided on the front shell for outputting a transmission signal; A receiving module provided on the circuit board and electrically connected to the control module. The receiving module is configured to receive the transmission signal, detect the relative position relationship between the front shell and the back plate according to the transmission signal, and output a corresponding detection signal to the control module, so that the control module outputs a warning control signal when it determines that the relative position relationship between the front shell and the back plate has changed according to the detection signal.

3. The doorbell anti-disassembly alarm circuit according to claim 2, wherein, The transmitting module includes an infrared transmitting module, and the receiving module includes an infrared receiving module.

4. The doorbell anti-disassembly alarm circuit according to claim 1, characterized in that, The detection module includes a contact switch, and the front shell is provided with an abutting portion corresponding to the contact switch. When the front shell covers the back plate, the contact switch contacts the abutting portion. The contact switch is configured to detect the contact situation between itself and the abutting portion and output a corresponding detection signal to the control module, so that the control module outputs a warning control signal when it determines that the relative position relationship between the front shell and the back plate has changed according to the detection signal.

5. The doorbell anti-disassembly alarm circuit according to claim 1, wherein The detection module includes connecting contacts and a connecting contact piece. The number of the connecting contact pieces is two. The connecting contact pieces are provided on the back plate, and the connecting contact is provided on the front shell. When the connecting contact is inserted between the two connecting contact pieces, the two connecting contact pieces are electrically connected. The control module is configured to output a warning control signal when it determines that the relative position relationship between the front shell and the back plate has changed according to the electrical connection situation of the two connecting contact pieces.

6. The doorbell anti-disassembly alarm circuit according to any one of claims 1 to 5, characterized in that The anti-tamper alarm circuit of the doorbell further includes: A camera module electrically connected to the control module. The camera module is configured to photograph a preset area and output a camera signal to the control module; The control module is further configured to output a warning control signal when it determines that the portrait information in the preset area does not match the preset personnel information according to the camera signal, so that the warning module issues a warning according to the warning control signal.

7. The doorbell anti-disassembly alarm circuit according to any one of claims 6, characterized in that, The control module includes: A memory for storing preset personnel information; A controller, configured to match the portrait information within a preset area corresponding to the camera signal with preset personnel information, and output a warning control signal when it is determined that the portrait information within the preset area does not match the preset personnel information, so that the warning module issues a warning according to the warning control signal.

8. The doorbell anti-disassembly alarm circuit according to claim 6, characterized in that, The doorbell anti-tamper alarm circuit further includes: A communication module, which has a communication end communicatively connected to an external terminal, and the communication module is electrically connected to the control module; The control module is configured to send the camera signal to the external terminal through the communication module.

9. The doorbell anti-disassembly alarm circuit according to claim 8, wherein, The control module is further configured to send the camera signal to the external terminal when it is determined that the portrait information within the preset area does not match the preset personnel information, and to output a warning control signal when an authorization instruction feedback from the external terminal is not received within a preset time period, so that the warning module issues a warning according to the warning control signal.

10. A doorbell, characterized in that, The doorbell includes a front shell, a circuit board and a back plate. The circuit board is disposed on the back plate, the front shell covers the back plate, and the circuit board is provided with the doorbell anti-tamper alarm circuit according to any one of claims 1 to 9.

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