Kitchen fire turn-off forgetting monitoring circuit and method for judging whether people exist in kitchen

Abstract

The invention discloses a kitchen fire turn-off forgetting monitoring circuit and a method for judging whether a person is in a kitchen, the circuit comprises a millimeter wave radar module and a pyroelectric infrared module, the millimeter wave radar module and the pyroelectric infrared module are both connected with a controller, a sensitivity adjusting pin of the pyroelectric infrared module is connected with the controller, and the controller is connected with the pyroelectric infrared module. The controller is used for adjusting the sensitivity of the pyroelectric infrared module and adjusting the parameters of the millimeter wave radar. The method comprises the following steps: initializing a millimeter wave radar module and a pyroelectric infrared module through a controller; when the first detection result of the millimeter-wave radar module and the second detection result of the pyroelectric infrared module both detect the human body, it is judged that a person is in the kitchen, sensitivity adjustment is conducted on the millimeter-wave radar module and the pyroelectric infrared module through the controller under different conditions, and whether the person is in the kitchen or not is accurately judged. The influence that a single sensor is easily triggered by mistake in a complex kitchen environment, a high-temperature environment or vibration and the like is effectively avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of kitchen safety, and in particular relates to a kitchen fire forgetting to turn off the fire monitoring circuit and a method for judging whether there is someone in the kitchen. Background Art

[0002] In modern society, the penetration rate of gas is very high, and safety accidents caused by users forgetting to turn off the gas stove in the kitchen frequently occur. In order to solve such problems, a fire-prone alarm device is currently proposed on the market. However, the device is easily affected by the ambient temperature in the kitchen environment, and the result of detecting the human body is inaccurate. At the same time, the existing technology uses a single sensor for detection of the human body, and the detection method is rough, which will also affect the accuracy of the detection.

[0003] Therefore, how to accurately identify the presence of a human body in a kitchen environment with a relatively high temperature, so as to control the gas on and off of a gas stove, is a technical problem to be solved by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem of inaccurate human body recognition in a kitchen environment with a high temperature in the prior art.

[0005] In order to achieve the above technical objectives, on the one hand, the present invention provides a kitchen forget to turn off the fire monitoring circuit, the circuit comprising:

[0006] A human body detection module, comprising a millimeter wave radar module and a pyroelectric infrared module, wherein both the millimeter wave radar and the pyroelectric infrared module are connected to a controller, wherein a sensitivity adjustment pin of the pyroelectric infrared module is connected to the controller, and the controller is used to adjust the sensitivity of the pyroelectric infrared module and adjust the parameters of the millimeter wave radar;

[0007] A voice broadcast module, connected to the controller;

[0008] The power supply module is connected to the human body detection module, the controller and the voice broadcast module respectively, and is used to supply power to the human body detection module, the controller and the voice broadcast module.

[0009] Furthermore, the sensitivity adjustment pin of the pyroelectric infrared module is connected to the controller, specifically, the sensitivity adjustment pin of the pyroelectric infrared module is connected to the DAC output pin of the controller through a resistor R203, and the sensitivity adjustment pin of the pyroelectric infrared module is also grounded through a capacitor C206.

[0010] Furthermore, the connection between the millimeter-wave radar and the controller is specifically that the UART_RX pin of the millimeter-wave radar is connected to the TX pin of the controller, and the UART_TX pin of the millimeter-wave radar is connected to the RX pin of the controller.

[0011] On the other hand, the present invention also provides a method for judging whether there is someone in the kitchen when the kitchen fire is forgotten to be turned off, which is applied to the monitoring circuit as described above, and the method comprises:

[0012] S1. Initialize the millimeter wave radar module and the pyroelectric infrared module;

[0013] S2, determining whether the millimeter wave radar module detects a human body, if so, executing step S3, if not, executing step S4;

[0014] S3, determining whether the pyroelectric infrared module detects a human body, if so, determining that there is someone in the kitchen, if not, executing the first recheck process to confirm whether there is someone in the kitchen;

[0015] S4. Determine whether the pyroelectric infrared module detects a human body. If so, execute the second recheck process to confirm whether there is anyone in the kitchen. If not, determine that there is no one in the kitchen.

[0016] Furthermore, the first re-examination process specifically includes:

[0017] A1. Increase the sensitivity of the pyroelectric infrared module by one level;

[0018] A2, determining whether the pyroelectric infrared module with improved sensitivity detects a human body, if so, determining that there is someone in the kitchen, if not, executing step A3;

[0019] A3. Adjust the sensitivity of the pyroelectric infrared module to the maximum value;

[0020] A4. Determine whether the pyroelectric infrared module detects a human body after the sensitivity is adjusted to the maximum value. If so, it is determined that there is someone in the kitchen. If not, it is determined that there is someone in the kitchen and the pyroelectric infrared module is damaged.

[0021] Furthermore, the second re-examination process specifically includes:

[0022] B1. Adjusting the trigger threshold of the millimeter wave radar module to the lowest level;

[0023] B2, determine whether the millimeter-wave radar module detects a human body after the trigger threshold is adjusted to the lowest level. If so, determine that there is someone in the kitchen. If not, execute step B3;

[0024] B3, reducing the sensitivity of the pyroelectric infrared module by one level;

[0025] B4, determining whether the pyroelectric infrared module with reduced sensitivity detects a human body, if not, determining that no one is present in the kitchen, if so, executing step B5;

[0026] B5. Adjust the sensitivity of the pyroelectric infrared module to the minimum value;

[0027] B6. Determine whether the pyroelectric infrared module detects a human body after the sensitivity is adjusted to the minimum value. If not, it is determined that there is no one in the kitchen. If so, it is determined that there is someone in the kitchen and the millimeter-wave radar module is damaged.

[0028] Furthermore, when the pyroelectric infrared module or the millimeter wave radar module is damaged, an alarm is given through the sound and light alarm module.

[0029] The present invention provides a kitchen fire forgetting to turn off the fire monitoring circuit and a method for judging whether there is someone in the kitchen. Compared with the prior art, the circuit includes a human body detection module, including a millimeter wave radar module and a pyroelectric infrared module, and the millimeter wave radar and the pyroelectric infrared module are both connected to a controller, wherein a sensitivity adjustment pin of the pyroelectric infrared module is connected to the controller, and the controller is used to adjust the sensitivity of the pyroelectric infrared module and adjust the parameters of the millimeter wave radar; the method includes initializing the millimeter wave radar module and the pyroelectric infrared module through the controller; when the first detection result of the millimeter wave radar module and the second detection result of the pyroelectric infrared module both indicate that a human body is detected, it is determined that there is someone in the kitchen, and the sensitivity of the millimeter wave radar module and the pyroelectric infrared module are adjusted by the controller in different situations, so as to achieve accurate judgment on whether there is someone in the kitchen, and effectively avoid the influence of high temperature environment or vibration that easily causes false triggering of a single sensor in a complex kitchen environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 The figure shows a schematic diagram of the structure of a kitchen fire-forgetting-to-turn-off monitoring circuit provided in an embodiment of this specification;

[0032] Figure 2 The figure shows a schematic diagram of the structure of the millimeter wave radar module in the embodiment of this specification;

[0033] Figure 3 The figure shows a schematic diagram of the structure of the pyroelectric infrared module in the embodiment of this specification;

[0034] Figure 4 The figure shows a schematic diagram of the structure of the voice broadcast module in the embodiment of this specification;

[0035] Figure 5The figure shows a schematic diagram of the structure of the power module in the embodiment of this specification;

[0036] Figure 6 The figure shows a schematic diagram of the structure of the controller in the embodiment of this specification;

[0037] Figure 7 It is a flow chart of a method for judging whether there is someone in the kitchen when the kitchen is forgotten to turn off the fire in the embodiment of this specification;

[0038] Figure 8 It is a schematic diagram of the first re-examination process in the embodiment of this specification;

[0039] Fig. 9 Shown is a schematic diagram of the second re-inspection process in the embodiment of this specification. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0041] like Figure 1 The structure diagram of the kitchen fire monitoring circuit provided by the embodiment of this specification is shown. Although this specification provides the structure shown in the following embodiment or the accompanying drawings, more or fewer structures can be included in the structure based on routine or no creative work, and these structures are not limited to the structures shown in the embodiments or the accompanying drawings of this specification. When the structure is applied in the actual device or terminal product, it can be executed sequentially or in parallel according to the embodiment or module structure.

[0042] The kitchen fire-forgetting-to-turn-off monitoring circuit provided in the embodiments of this specification can be applied in various commercial and civilian kitchens. The circuit includes:

[0043] A human body detection module, comprising a millimeter wave radar module and a pyroelectric infrared module, wherein both the millimeter wave radar and the pyroelectric infrared module are connected to a controller, wherein a sensitivity adjustment pin of the pyroelectric infrared module is connected to the controller, and the controller is used to adjust the sensitivity of the pyroelectric infrared module and adjust the parameters of the millimeter wave radar;

[0044] A voice broadcast module, connected to the controller;

[0045] The power supply module is connected to the human body detection module, the controller and the voice broadcast module respectively, and is used to supply power to the human body detection module, the controller and the voice broadcast module.

[0046] Human body detection module, including millimeter wave radar module and pyroelectric infrared module;

[0047] A controller connected to the human body detection module;

[0048] A voice broadcast module, connected to the controller;

[0049] The power supply module is connected to the human body detection module, the controller and the voice broadcast module respectively, and is used to supply power to the human body detection module, the controller and the voice broadcast module.

[0050] Specifically, the kitchen forget to turn off the fire monitoring circuit in the present application at least includes a human body detection module, a controller, a voice broadcast module and a power supply module, wherein the human body detection module includes a millimeter wave radar module and a pyroelectric infrared module. The millimeter wave radar module and the pyroelectric infrared module work together to effectively avoid the influence of high temperature or vibration on the detection of a single detection module, thereby improving the accuracy of human body detection in the kitchen. In addition, the circuit can also include a USB module, a storage module, a sampling module and a reset button, etc. The USB module can be directly connected to an external device, or power the power supply module to adjust the detection accuracy of the human body detection module. The storage module is used to store the records of each detection, and the sampling module is used to sample the working current. At the same time, the controller also integrates a communication module for wireless communication with a remote device and receiving instructions from the remote device.

[0051] In the embodiments of the present application, Figure 2 The structure diagram of the millimeter wave radar module is shown. The power supply pin of the millimeter wave radar is respectively connected to one end of the capacitor C202 and the VCC power supply, and the other end of the capacitor C202 is grounded. At the same time, the UART_TX pin and UART_RX pin of the millimeter wave radar are respectively connected to the RX pin and TX pin of the controller, which are used to set the trigger threshold parameters of the radar module and obtain parameters such as the distance value. The radar recognition signal output pin OUT is connected to the pin of the controller whose network signal is RADAR_OUT, which is used to obtain the state of the radar identifying the moving object. The millimeter wave radar module specifically includes:

[0052] Pin 1 of chip P208 is connected to the VCC power supply and one end of capacitor C202 respectively, the other end of capacitor C202 is grounded, pin 2 of chip P208 is grounded, and pins 3, 4 and 5 of chip P208 are all connected to the controller.

[0053] In the embodiments of the present application, Figure 3 The figure shows the structure of the pyroelectric infrared module. The power supply pin of the pyroelectric infrared module is also connected in parallel with capacitors C219 and C220. The power supply pin of the pyroelectric infrared module is connected in parallel with two capacitors to filter the power supply. The sensitivity adjustment pin of the pyroelectric infrared module, i.e., pin 1, is connected to pin 11 in the controller, i.e., the DAC pin, through a resistor R203. The sensitivity of the sensor can be adjusted by adjusting the DAC output voltage. At the same time, the sensitivity adjustment pin of the pyroelectric infrared module is also grounded through a capacitor C206. The pyroelectric infrared module specifically includes:

[0054] Pin 1 of chip U205 is connected to the controller through resistor R203, and pin 1 of chip U205 is also connected to one end of capacitor C206, and the other end of capacitor C206 is grounded. Pin 2 of chip U205 is respectively connected to VCC power supply, one end of capacitor C219 and one end of capacitor C220, and pin 2 of chip U205 is also connected to pin 4 of chip U205, and the other end of capacitor C219 and the other end of capacitor C220 are both grounded, pin 3 and pin 6 of chip U205 are both grounded, and pin 5 of chip U205 is connected to the controller.

[0055] Specifically, the human body detection module is composed of an infrared pyroelectric sensor, also known as a pyroelectric infrared module, and a 24G millimeter-wave radar sensor, also known as a millimeter-wave radar module. The infrared pyroelectric sensor uses a pyroelectric sensor with a sensitivity adjustment function using an external analog voltage, such as BS612, etc. The sensitivity control pin of the infrared pyroelectric sensor is connected to the pin with an analog voltage output function (DAC) in the controller. The sensitivity of the pyroelectric sensor can be controlled by controlling the output voltage of the DAC. The human presence output signal of the pyroelectric sensor is connected to the ordinary IO port of the controller. The millimeter-wave radar module uses a module with a serial port for configuring parameters such as the trigger threshold, such as RD-03. The trigger threshold and other parameters of the radar module can be configured through the serial port. The human presence signal output pin of the radar module is connected to the ordinary IO port of the central control module.

[0056] In the embodiments of the present application, Figure 4 The figure shows the structure diagram of the voice broadcast module. Pin 7 of the voice broadcast module is respectively connected to the other end of capacitor C223, the other end of capacitor C201, VCC power supply and one end of magnetic bead L202. The other end of magnetic bead L202 is connected to +5Vin. The parameter of magnetic bead L202 is 600Ω / 100MHz, which can suppress high-frequency noise and spike interference on the power line. At the same time, capacitor C223 and capacitor C201 can ensure the smoothness of DC input. The voice broadcast module specifically includes:

[0057] Pin 1 of chip U202 is connected to the controller, pin 2 of chip U202 is grounded through capacitor C221, pin 3 of chip U202 is connected to the other end of resistor R211, one end of resistor R211 is connected to the other end of capacitor C222, one end of capacitor C222 is grounded, pin 4 of chip U202 is connected to the other end of resistor R212, one end of resistor R212 is connected to the other end of capacitor C224, one end of capacitor C222 is connected to the controller, pins 5 and 8 of chip U202 are both connected to terminal P202, pin 6 of chip U202 is grounded and is also respectively connected to one end of capacitor C223 and one end of capacitor C201, pin 7 of chip U202 is respectively connected to the other end of capacitor C223, the other end of capacitor C201, VCC power supply and one end of magnetic bead L202, and the other end of magnetic bead L202 is connected to +5Vin.

[0058] Specifically, in order to realize the voice playback alarm function of the device and the flexible requirements of personalized voice customization, based on the audio decoding function of the controller and its DAC output function, the DAC output is connected to the input of the external audio amplifier, and the power supply is connected to a 600Ω / 100MHz magnetic bead to suppress high-frequency noise and spike interference on the power line. At the same time, 10uF and 1uF capacitors are connected between the input voltage and the ground to ensure the smoothness of the DC input. The positive and negative phase inputs of the audio amplifier are connected in a differential input working mode, and the DC is isolated by an RC circuit composed of an 82nF capacitor and a 100K resistor to prevent signal interference and protect the integrity of the audio signal. At the same time, considering the need to update audio files, a large-capacity SPINOR Flash (such as: GD25Q80) is attached to the SPI pin of the controller to store audio files, and the files of the storage module can be upgraded via Wi-Fi to meet personalized needs.

[0059] In the embodiments of the present application, Figure 5 The figure shows a schematic diagram of the structure of a power module, which specifically includes:

[0060] Pin 1 of chip U401 is respectively connected to +5Vin, one end of capacitor C403, and pin 3 of chip U402, and pin 1 of chip U401 is also connected to pin 4 of chip U401, the other end of capacitor C403 is grounded, pin 2 of chip U401 is grounded, pin 3 of chip U401 is connected to one end of inductor L401, the other end of inductor L401 is respectively connected to one end of resistor R401, one end of capacitor C404 and VCC power supply, the other end of capacitor C404 is grounded, pin 5 of chip U401 is respectively connected to the other end of resistor R401 and one end of resistor R402, the other end of resistor R402 is grounded, pin 1 of chip U402 is grounded, and pin 2 and pin 4 of chip U402 are both connected to VCC power supply.

[0061] Specifically, the power module provides the required working voltage for the entire monitoring alarm device, and uses a DC-DC synchronous buck IC with a switching frequency of 1.5MHz to reduce the 5V input voltage to 3.3V. The power input has multiple micro USB interfaces, and the multiple micro USB interfaces include at least two types of packages, vertical and horizontal, which are flexibly applicable to different power connection methods.

[0062] In the embodiments of the present application, Figure 6 The figure shows a schematic diagram of the structure of the controller, which specifically includes:

[0063] Pin 1 of the chip U201 is grounded, pin 2 of the chip U201 is connected to the VCC power supply and one end of the capacitor C212 respectively, the other end of the capacitor C212 is grounded, pin 3 of the chip U201 is connected to the EN pin in the USB module, pin 25 of the chip U201 is connected to the GPIO0_download pin in the USB module, pin 4 of the chip U201 is connected to the ADC_VCC pin in the sampling module, pin 7 of the chip U201 is connected to the ADC_USB_EN in the sampling module, pin 5, pin 9 and pin 12 of the chip U201 are all connected to the LED module, pin 8 of the chip U201 is connected to the KEY pin in the reset button, pin 10 of the chip U201 is connected to one end of the capacitor C224 in the voice broadcast module, pin 11 of the chip U201 is connected to one end of the resistor R203 in the pyroelectric infrared module, pin 13 of the chip U201 is connected to pin 5 of the pyroelectric infrared module, and the chip Pin 14 of chip U201 is connected to pin 1 of chip U202 in the voice broadcast module, pin 15 and pin 38 of the chip U201 are both grounded, pin 37 of the chip U201 is connected to the SPI_MOSI pin in the storage module, pin 31 of the chip U201 is connected to the SPI_MISO pin in the storage module, pin 30 of the chip U201 is connected to the SPI_CLK pin in the storage module, and pin 29 of the chip U201 is connected to the FLASH_S The PI_CS pin is connected, the pin 35 of the chip U201 is connected to the U0TXD pin in the USB module, the pin 34 of the chip U201 is connected to the U0RXD pin in the USB module, the pin 28 of the chip U201 is connected to the pin 4 of the chip P208 in the millimeter-wave radar module, the pin 27 of the chip U201 is connected to the pin 3 of the chip P208 in the millimeter-wave radar module, and the pin 28 of the chip U201 is connected to the pin 5 of the chip P208 in the millimeter-wave radar module.

[0064] Specifically, in order to achieve efficient use of overall resources, a highly integrated Wi-Fi chip is selected as the core of the overall control. The chip U201 is ESP32, which operates in the 2.4GHz frequency band. It not only allows the device to flexibly connect to the Wi-Fi network in station mode, hotspot mode, and hybrid mode, or to access other devices as a Wi-Fi access point, but also its dual-core processor and rich peripheral resources provide powerful computing power and multi-tasking capabilities, allowing ESP32 to be used as the MCU of the entire system. The ESP32 chip also provides analog output (DAC) function and analog acquisition (ADC) function, as well as serial communication function.

[0065] like Figure 7The flowchart of the method for judging whether there is someone in the kitchen when the kitchen forgets to turn off the fire provided by the embodiment of this specification is shown. Although this specification provides the method operation steps or device structures shown in the following embodiments or drawings, the method or device may include more or fewer operation steps or module units after partial merger based on routine or no creative labor. In the steps or structures where there is no necessary causal relationship logically, the execution order of these steps or the module structure of the device is not limited to the execution order or module structure shown in the embodiments or drawings of this specification. When the method or module structure is applied in actual devices, servers or terminal products, it can be executed sequentially or in parallel according to the method or module structure shown in the embodiments or drawings (for example, in the environment of parallel processors or multi-threaded processing, or even in the implementation environment of distributed processing and server clusters).

[0066] In the method for judging whether someone is in the kitchen when the kitchen forgets to turn off the fire provided in the embodiment of this description, in the circuit as described above, Figure 1 As shown, the method specifically comprises the following steps:

[0067] S1. Initialize the millimeter wave radar module and the pyroelectric infrared module;

[0068] Specifically, initializing the millimeter-wave radar module is to initialize the trigger threshold parameters in the millimeter-wave radar module, and initializing the pyroelectric infrared module is to initialize its detection sensitivity and adjust the detection sensitivity to a preset level, and the adjustment method is the above-mentioned method of adjusting the output voltage value of the DAC pin of the controller.

[0069] S2, determining whether the millimeter wave radar module detects a human body, if so, executing step S3, if not, executing step S4;

[0070] Specifically, when the millimeter-wave radar module detects a human body, the detection result needs to be further verified by the pyroelectric infrared module.

[0071] S3, determining whether the pyroelectric infrared module detects a human body, if so, determining that there is someone in the kitchen, if not, executing the first recheck process to confirm whether there is someone in the kitchen;

[0072] Specifically, when both the millimeter-wave radar module and the pyroelectric infrared module detect a person, it means that both are working normally. If the detection results are the same, it can be determined that there is someone in the kitchen. If the pyroelectric infrared module still does not detect a human body, the first re-inspection process is executed to further determine whether there is someone in the kitchen.

[0073] like Figure 8 The figure shows a schematic diagram of the first re-inspection process in the embodiment of this specification, and the first re-inspection process specifically includes:

[0074] A1. Increase the sensitivity of the pyroelectric infrared module by one level;

[0075] A2, determining whether the pyroelectric infrared module with improved sensitivity detects a human body, if so, determining that there is someone in the kitchen, if not, executing step A3;

[0076] A3. Adjust the sensitivity of the pyroelectric infrared module to the maximum value;

[0077] A4. Determine whether the pyroelectric infrared module detects a human body after the sensitivity is adjusted to the maximum value. If so, it is determined that there is someone in the kitchen. If not, it is determined that there is someone in the kitchen and the pyroelectric infrared module is damaged.

[0078] Specifically, when the millimeter-wave radar module detects a human body but the pyroelectric infrared module does not detect a human body, first consider whether the detection sensitivity of the pyroelectric infrared module is low, adjust it one or more levels and then perform detection again. If a human body is detected at this time, it is determined that there is someone in the kitchen. If no human body is detected at this time, the sensitivity of the pyroelectric infrared module is adjusted to the maximum value and detection is performed again. If the detection result is that a human body is detected, it is determined that there is someone in the kitchen. If not, it is determined that there is someone in the kitchen and the pyroelectric infrared module is damaged, and an alarm is issued through the sound and light alarm module.

[0079] S4. Determine whether the pyroelectric infrared module detects a human body. If so, execute the second recheck process to confirm whether there is anyone in the kitchen. If not, determine that there is no one in the kitchen.

[0080] like Fig. 9 The figure shows a schematic diagram of the second re-examination process in the embodiment of this specification, and the second re-examination process specifically includes:

[0081] B1. Adjusting the trigger threshold of the millimeter wave radar module to the lowest level;

[0082] B2, determine whether the millimeter-wave radar module detects a human body after the trigger threshold is adjusted to the lowest level. If so, determine that there is someone in the kitchen. If not, execute step B3;

[0083] B3, reducing the sensitivity of the pyroelectric infrared module by one level;

[0084] B4, determining whether the pyroelectric infrared module with reduced sensitivity detects a human body, if not, determining that no one is present in the kitchen, if so, executing step B5;

[0085] B5. Adjust the sensitivity of the pyroelectric infrared module to the minimum value;

[0086] B6. Determine whether the pyroelectric infrared module detects a human body after the sensitivity is adjusted to the minimum value. If not, it is determined that there is no one in the kitchen. If so, it is determined that there is someone in the kitchen and the millimeter-wave radar module is damaged.

[0087] Specifically, when the millimeter-wave radar module does not detect a human body but the pyroelectric infrared module detects a human body, the trigger threshold parameter of the millimeter-wave radar module is adjusted first, and the trigger threshold parameter is adjusted to the lowest trigger threshold and then detected again. If the millimeter-wave radar module detects a human body at this time, it means that the trigger threshold of the millimeter-wave radar module was relatively high before. If the millimeter-wave radar does not detect a human body at this time, the sensitivity of the pyroelectric infrared module is reduced by one level, and then it is determined whether the pyroelectric infrared module with reduced sensitivity detects a human body. If a human body is not detected at this time, it means that the sensitivity of the pyroelectric infrared module was too high before, resulting in a misjudgment, and then it is determined that there is no one in the kitchen. If a human body is detected at this time, the sensitivity of the pyroelectric infrared module is further adjusted to the minimum value. If the human body is still detected after the sensitivity of the pyroelectric infrared module is adjusted to the minimum value, it means that there is someone in the kitchen and the millimeter-wave radar is faulty or damaged.

[0088] The present application scheme cooperates with the millimeter wave radar module and the pyroelectric infrared module to effectively avoid false alarms detected by a single sensor module, and can more accurately detect the presence of human bodies in the kitchen, while also being able to detect damaged sensor modules.

[0089] The controller can be implemented in any appropriate manner, for example, the controller can take the form of a computer-readable medium such as a microprocessor or processor and a computer-readable program code (such as software or firmware) that can be executed by the (micro)processor, a logic gate, a switch, an application specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, ATMEL AT91SAM, MICROCHIP PIC18F26K20, and SILICONE LABS C8051F320. The memory controller can also be implemented as part of the control logic of the memory. It is also known to those skilled in the art that in addition to implementing the controller in a purely computer-readable program code manner, the controller can be implemented in the form of a logic gate, a switch, an application specific integrated circuit, a programmable logic controller, and an embedded microcontroller by logically programming the method steps. Therefore, such a controller can be considered as a hardware component, and the devices included therein for implementing various functions can also be considered as structures within the hardware component. Or even, the devices for implementing various functions can be considered as both software modules for implementing the method and structures within the hardware component.

[0090] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this specification. In this specification, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0091] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A kitchen fire monitoring circuit, characterized in that: The circuit comprises A human body detection module, comprising a millimeter wave radar module and a pyroelectric infrared module, wherein both the millimeter wave radar and the pyroelectric infrared module are connected to a controller, wherein a sensitivity adjustment pin of the pyroelectric infrared module is connected to the controller, and the controller is used to adjust the sensitivity of the pyroelectric infrared module and adjust the parameters of the millimeter wave radar; A voice broadcast module, connected to the controller; The power supply module is connected to the human body detection module, the controller and the voice broadcast module respectively, and is used to supply power to the human body detection module, the controller and the voice broadcast module.

2. The kitchen fire-forgetting-to-turn-off monitoring circuit according to claim 1, characterized in that: The sensitivity adjustment pin of the pyroelectric infrared module is connected to the controller, specifically, the sensitivity adjustment pin of the pyroelectric infrared module is connected to the DAC output pin of the controller through a resistor R203, and the sensitivity adjustment pin of the pyroelectric infrared module is also grounded through a capacitor C206.

3. The kitchen forgetting to turn off the fire monitoring circuit as claimed in claim 1, characterized in that: The connection between the millimeter-wave radar and the controller is specifically that the UART_RX pin of the millimeter-wave radar is connected to the TX pin of the controller, and the UART_TX pin of the millimeter-wave radar is connected to the RX pin of the controller.

4. A method for determining whether there is someone in the kitchen, applied to the monitoring circuit as described in any one of claims 1 to 3, characterized in that: The method comprises: S1. Initialize the millimeter wave radar module and the pyroelectric infrared module; S2, determining whether the millimeter wave radar module detects a human body, if so, executing step S3, if not, executing step S4; S3, determining whether the pyroelectric infrared module detects a human body, if so, determining that there is someone in the kitchen, if not, executing the first recheck process to confirm whether there is someone in the kitchen; S4. Determine whether the pyroelectric infrared module detects a human body. If so, execute the second recheck process to confirm whether there is anyone in the kitchen. If not, determine that there is no one in the kitchen.

5. The method according to claim 4, characterized in that The first re-examination process specifically includes: A1. Increase the sensitivity of the pyroelectric infrared module by one level; A2, determining whether the pyroelectric infrared module with improved sensitivity detects a human body, if so, determining that there is someone in the kitchen, if not, executing step A3; A3. Adjust the sensitivity of the pyroelectric infrared module to the maximum value; A4. Determine whether the pyroelectric infrared module detects a human body after the sensitivity is adjusted to the maximum value. If so, it is determined that there is someone in the kitchen. If not, it is determined that there is someone in the kitchen and the pyroelectric infrared module is damaged.

6. The method according to claim 4, characterized in that The second re-examination process specifically includes: B1. Adjusting the trigger threshold of the millimeter wave radar module to the lowest level; B2, determine whether the millimeter-wave radar module detects a human body after the trigger threshold is adjusted to the lowest level. If so, determine that there is someone in the kitchen. If not, execute step B3; B3, reducing the sensitivity of the pyroelectric infrared module by one level; B4, determining whether the pyroelectric infrared module with reduced sensitivity detects a human body, if not, determining that no one is present in the kitchen, if so, executing step B5; B5. Adjust the sensitivity of the pyroelectric infrared module to the minimum value; B6. Determine whether the pyroelectric infrared module detects a human body after the sensitivity is adjusted to the minimum value. If not, it is determined that there is no one in the kitchen. If so, it is determined that there is someone in the kitchen and the millimeter-wave radar module is damaged.

7. The method for determining whether there is someone in the kitchen as claimed in any one of claims 5 and 6, characterized in that: When the pyroelectric infrared module or the millimeter wave radar module is damaged, an alarm is given through the sound and light alarm module.

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