A networked infrared dual-detection detector

Abstract

The present invention discloses a networked infrared dual-detection detector, which relates to the field of sensing and detection security alarm technology, including a microcontroller unit MCU, a pyro-infrared sensor, a microwave sensor, a signal acquisition and processing circuit, a power supply circuit, an anti-disassembly circuit, a 485 communication circuit and a micro-power wireless module, wherein the microcontroller unit is respectively connected to the signal acquisition and processing circuit, the power supply circuit, the anti-disassembly circuit, the 485 communication circuit and the micro-power wireless module; the device adopts an optional dual networking method. Method 1: adopt the industry standard MODBUS-RTU communication protocol, use the RS-485 communication method for networking, and the host or background monitors the status of the infrared dual-detection detector by polling; Method 2: adopt a hot-swappable micro-power wireless module for networking; the present invention adopts a microcontroller unit to perform quantitative calculations on the collected signals, conduct comprehensive intelligent analysis, and identify interference signals, so that the detector can alarm human intrusion more quickly, stably and accurately, and reduce the false alarm rate.

Description

Technical Field

[0001] The invention relates to the technical field of sensing and detecting safety alarms, and in particular to a networked infrared dual-detection detector. Background Art

[0002] With the development of Internet of Things technology, people have higher and higher requirements on the performance of detectors. Conventional single infrared detectors and single microwave detectors have certain limitations in performance, reliability and sensitivity.

[0003] Since infrared detectors are sensitive to horizontally moving targets but not to vertically moving targets, and microwaves are sensitive to vertically moving targets but not to horizontally moving targets, the combined application of the two technologies can complement each other for better results. Currently, many detectors use this combination of infrared and microwaves and apply them to alarm devices.

[0004] Infrared dual-detection detectors prevent intrusion by monitoring the movement of human bodies within a certain range. Its technical indicators determine the rapidity and stability of the alarm device. Infrared dual-detection detectors combine the advantages of passive infrared and microwaves, and compensate each other in performance, greatly reducing the false alarm rate, thereby improving the reliability of security applications.

[0005] Currently, most of the infrared dual-detection detectors on the market do not have networking functions. The alarm information can only be transmitted through the communication unit of the alarm host, which makes wiring more troublesome. Alarm hosts are generally divided into different models according to the number of interfaces, and the number of detectors connected to different places is also different. Therefore, it not only causes a waste of hardware interface resources, but also complicates the design of the host. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention discloses a networked infrared dual-detection detector, which adopts an optional dual networking method. Method 1: adopt the industry standard MODBUS-RTU communication protocol, use RS-485 communication method for networking, and the host or background monitors the status of the infrared dual-detection detector by polling; Method 2: adopt hot-swappable micro-power wireless module for networking. Under normal conditions, the micro-control unit of the detector works in low-power mode to achieve energy saving and power saving; when the pyro-infrared sensor or microwave sensor detects human intrusion, the micro-control unit automatically wakes up from the low-power mode and performs signal processing. When the pyro-infrared sensor and the microwave sensor send out an alarm signal at the same time, the detector transmits the alarm information through the 485 communication method or the micro-power wireless module.

[0007] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is: a networked infrared dual-detection detector, characterized in that it includes a micro control unit MCU, a pyroelectric infrared sensor, a microwave sensor, a signal acquisition and processing, a power supply circuit, an anti-tampering circuit, a 485 communication circuit and a micro-power wireless module, and the micro control unit is respectively connected to the signal acquisition and processing, the power supply circuit, the anti-tampering circuit, the 485 communication circuit, and the micro-power wireless module;

[0008] The microcontroller unit has three low-power modes: sleep mode, stop mode and standby mode, among which the standby mode can achieve the lowest power consumption of the device. When the second networking mode is adopted, the microcontroller unit enters the standby mode when the environment is normal; when the sensor detects a human intrusion, the microcontroller unit is awakened from the standby mode, parses, processes and analyzes the received data, and then identifies the intruder and the interference signal to prevent the detector from false alarms;

[0009] The microcontroller unit has a further feature that when a group of networks are used, the MODBUS-RTU protocol is used, and the host continuously sends messages to poll the detector. In this way, the microcontroller is always in a normal working mode;

[0010] The signal acquisition and processing circuit: one end is connected to the pyroelectric infrared sensor and the microwave sensor, and the other end is connected to the micro control unit, amplifies the tiny signal received by the sensor, converts the signal into a square wave signal through a comparison circuit, and sends it to the micro control unit for intelligent analysis and quantitative calculation;

[0011] The power supply circuit adopts a 9-20V wide voltage power supply mode, which has stronger power adaptability, prevents voltage instability from causing equipment failure or unusability, and makes the product more energy-saving and reliable;

[0012] The anti-dismantling circuit is directly connected to the IO port of the MCU. Two button switches are placed at the upper and lower positions of the detector as anti-dismantling contacts. Under normal conditions, the button switches are pressed using the pressure after the structure is locked. When the detector is disassembled, the anti-dismantling contacts are disconnected, the level of the IO port changes, and an interrupt signal is generated to the MCU, which responds to the interrupt and transmits the alarm information.

[0013] The anti-tampering circuit is further characterized in that: the switch state is detected multiple times and a delay is added between each two detections to eliminate jitter. After the microcontroller unit is awakened by the anti-tampering interrupt, a delay of 200ms is required to eliminate jitter to confirm that the anti-tampering switch is indeed opened;

[0014] The 485 circuit: one end is connected to the microcontroller, and the other end is connected to the host interface or the background. When a person intrusion is found, the alarm information is transmitted through the serial communication mode and the polling mode of the host or the background;

[0015] The micro-power wireless module includes a transmitting module and a receiving module. One end of the transmitting module is connected to the antenna and other interface modules, and the other end is connected to the micro control unit. The receiving module is placed in the host or background server. When the environment is normal, it works in sleep mode. When a person intrusion is found, the micro control unit controls the transmitting module to start, send out a wireless alarm signal, notify the receiving module, and pass on the alarm information.

[0016] The present invention has the following beneficial effects:

[0017] 1. The infrared sensor adopts the dual-element infrared probe design imported from Germany, which has high sensitivity, strong reliability and can provide faster early warning.

[0018] 2. Flexible networking mode, with optional dual networking modes, 485 communication networking and micro-power wireless networking; it can be networked with other devices with 485 communication or micro-power wireless functions.

[0019] 3. The networking range is wide, the transmission range of 485 communication can reach 1200 meters; the communication distance of micro-power wireless can reach about 800 meters when there are buildings blocking it; when multiple wireless infrared dual-detection detectors need to be installed within the same communication distance, only one micro-power wireless receiving module is needed to realize the information transmission of all infrared dual-detection detectors.

[0020] 4. The microcontroller unit MCU is used to perform quantitative calculations on the collected signals, conduct comprehensive intelligent analysis, and identify interference signals, so that the detector can alarm human intrusion more quickly, stably, and accurately, reducing the false alarm rate.

[0021] 5. The micro-power wireless module has data encryption and compression function, which can reduce transmission time, reduce the probability of interference, and improve reliability and transmission efficiency.

[0022] 6. The configuration software on the PC can be used to configure and query the parameters of the infrared dual-detection detector through 485 communication or micro-power wireless receiving host module, which not only reduces the tediousness of setting up the debugging environment, but also saves installation and debugging time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a structural block diagram of a networked infrared dual-detection detector.

[0024] Figure 2 The figure is a dimension diagram of a networked infrared dual-detection detector of the present invention. DETAILED DESCRIPTION

[0025] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to embodiments and drawings.

[0026] A networked infrared dual-detection detector of this embodiment has a structural block diagram as shown in FIG. Figure 1 As shown, it includes a micro control unit MCU, a pyro infrared sensor, a microwave sensor, a signal acquisition and processing, a power supply circuit, an anti-tampering circuit, a 485 communication circuit and a micro-power wireless module, and the micro control unit is respectively connected with the signal acquisition and processing, the power supply circuit, the anti-tampering circuit, the 485 communication circuit and the micro-power wireless module;

[0027] The microcontroller unit has three low-power modes: sleep mode, stop mode and standby mode, among which the standby mode can achieve the lowest power consumption of the device. When the second mode is used for networking, the microcontroller unit enters the standby mode when the environment is normal; when the sensor detects a human intrusion, the microcontroller unit is awakened from the standby mode, parses, processes and analyzes the received data, and then identifies the intruder and the interference signal to prevent the detector from false alarms;

[0028] The microcontroller unit has a further feature that when a group of networks are used, the MODBUS-RTU protocol is used, and the host continuously sends messages to poll the detector. In this way, the microcontroller is always in a normal working mode;

[0029] The signal acquisition and processing circuit: one end is connected to the pyroelectric infrared sensor and the microwave sensor, and the other end is connected to the micro control unit, amplifies the tiny signal received by the sensor, converts the signal into a square wave signal through a comparison circuit, and sends it to the micro control unit for intelligent analysis and quantitative calculation;

[0030] The power supply circuit adopts a 9-20V wide voltage power supply mode, which has stronger power adaptability, prevents voltage instability from causing equipment failure or unusability, and makes the product more energy-saving and reliable;

[0031] The anti-dismantling circuit is directly connected to the IO port of the MCU. Two button switches are placed at the upper and lower positions of the detector as anti-dismantling contacts. Under normal conditions, the button switches are pressed using the pressure after the structure is locked. When the detector is disassembled, the anti-dismantling contacts are disconnected, the level of the IO port changes, and an interrupt signal is generated to the MCU, which responds to the interrupt and transmits the alarm information.

[0032] The anti-tampering circuit is further characterized in that: the switch state is detected multiple times and a delay is added between each two detections to eliminate jitter. After the microcontroller unit is awakened by the anti-tampering interrupt, a delay of 200ms is required to eliminate jitter to confirm that the anti-tampering switch is indeed opened;

[0033] The 485 circuit: one end is connected to the microcontroller, and the other end is connected to the host interface or the background. When a person intrusion is found, the alarm information is transmitted through the serial communication mode and the polling mode of the host or the background;

[0034] The micro-power wireless module includes a transmitting module and a receiving module. One end of the transmitting module is connected to the antenna and other interface modules, and the other end is connected to the micro control unit. The receiving module is placed in the host or background server. When the environment is normal, it works in sleep mode. When a person intrusion is found, the micro control unit controls the transmitting module to start, send out a wireless alarm signal, notify the receiving module, and pass on the alarm information.

[0035] A networked infrared dual-detection detector of this embodiment adopts an optional dual networking method. Method 1: adopt the industry standard MODBUS-RTU communication protocol, use RS-485 communication method for networking, and the host or background monitors the status of the infrared dual-detection detector by polling; Method 2: Use hot-swappable micro-power wireless module for networking. Under normal conditions, the micro-control unit of the detector works in low-power mode to achieve energy saving and power saving; when the pyro-infrared sensor or microwave sensor detects human intrusion, the micro-control unit automatically wakes up from the low-power mode and performs signal processing. When the pyro-infrared sensor and the microwave sensor send out an alarm signal at the same time, the detector transmits the alarm information through the 485 communication method or the micro-power wireless module.

[0036] like Figure 2 As shown in the figure, the external dimensions of a networked infrared dual-detection detector of this embodiment are 110 mm in length and 65 mm in width respectively.

[0037] The above embodiments are only for explaining the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the present invention. The technologies not involved in the present invention can be realized by existing technologies.

Claims

1. A networked infrared dual-detection detector, characterized in that: It includes a micro control unit MCU, a pyro infrared sensor, a microwave sensor, a signal acquisition and processing circuit, a power supply circuit, an anti-tampering circuit, a 485 communication circuit and a micro-power wireless module, wherein the micro control unit MCU is connected to the signal acquisition and processing circuit, the power supply circuit, the anti-tampering circuit, the 485 communication circuit and the micro-power wireless module respectively; The microcontroller unit MCU has three low power consumption modes: sleep mode, stop mode and standby mode, wherein the standby mode can realize the lowest power consumption of the device; The signal acquisition and processing circuit: one end is connected to the pyroelectric infrared sensor and the microwave sensor, and the other end is connected to the micro control unit, amplifies the tiny signal received by the sensor, converts the signal into a square wave signal through a comparison circuit, and sends it to the micro control unit MCU for intelligent analysis and quantitative calculation; The power supply circuit adopts a 9~20V wide voltage power supply mode; The anti-disassembly circuit is directly connected to the IO port of the MCU. Two button switches are placed at the upper and lower positions of the detector as anti-disassembly contacts. Under normal conditions, the button switches are pressed using the pressure after the structure is locked. When the detector is disassembled, the anti-disassembly contacts are disconnected, the level of the IO port changes, and an interrupt signal is generated to the MCU, which responds to the interrupt and transmits the alarm information. The 485 communication circuit: one end is connected to the microcontroller, and the other end is connected to the host interface or the background. When a person intrusion is found, the alarm information is transmitted through the serial communication mode and the polling mode of the host or the background; The micro-power wireless module: one end is connected to the antenna interface module, and the other end is connected to the micro-control unit MCU; when the environment is normal, it works in the sleep mode, and when a person intrusion is found, a wireless alarm signal is sent to transmit the alarm information; The detector adopts dual networking mode. Mode 1: 485 communication networking, using the industry standard MODBUS-RTU communication protocol, using RS-485 communication mode for networking, the host or background monitors the status of the infrared dual-detection detector by polling, at this time the microcontroller is always in normal working mode; Method 2: Micro-power wireless networking; hot-swappable micro-power wireless modules are used for networking. Under normal conditions, the micro-control unit of the detector works in low-power mode to achieve energy saving and power saving. When the pyro-infrared sensor or microwave sensor detects human intrusion, the micro-control unit automatically wakes up from the low-power mode and performs signal processing. When the pyro-infrared sensor and microwave sensor send out alarm signals at the same time, the detector transmits the alarm information through 485 communication or micro-power wireless module; or it can be networked with other devices with 485 communication or micro-power wireless functions. When a network is formed in the manner described above, the microcontroller is continuously polled by the host computer by sending messages to the detector. In this manner, the microcontroller is always in a normal working mode. When the second networking method is adopted, under normal conditions, the micro control unit enters the standby mode; when the sensor detects a human intrusion, the micro control unit is awakened from the standby mode, parses, processes and analyzes the received data, and then identifies the intruder and the interference signal to prevent the detector from false alarms; The anti-tamper circuit detects the switch status multiple times and adds a delay between each two detections to eliminate jitter. After the microcontroller unit is awakened by the anti-tamper interrupt, a delay of 200ms is required to eliminate jitter to confirm that the anti-tamper switch is indeed opened. The micro-power wireless module includes a transmitting module and a receiving module. One end of the transmitting module is connected to the antenna and other interface modules, and the other end is connected to the micro control unit. The receiving module is placed in the host or the background server. When the environment is normal, it works in the sleep mode. When a person intrusion is found, the transmitting module is controlled by the micro control unit to start, send out a wireless alarm signal, notify the receiving module, and transmit the alarm information.

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