Infrared scanning recognition technology is widely used in today's society, involving smart security, robot control, smart home and other fields. In the real world, due to the existence of some harsh environments and lack of good light, human detection based on visible light cannot be realized, which greatly limits the monitoring of space. Unlike human sensing of visible light, infrared pyroelectric scanning can detect specific targets that cannot be detected in the visible light range because of its strong radiation capability. However, the current infrared pyroelectric scanning technology still has many shortcomings, for example, the infrared pyroelectric scanning error is large, and the scanning object cannot be correctly and effectively identified, and a large-volume infrared pyroelectric module is required to effectively reduce the error. Unable to implement embedding. In view of these defects, this paper will use a reasonable controller and amplification filter device, combined with the micro power module, to design an infrared pyroelectric scanning module that can be embedded in household equipment, and realize embedded design on the basis of ensuring certain scanning accuracy. . Based on the infrared pyroelectric sensing technology, this paper designs and builds a WiFi-based infrared pyroelectric scanning module for embedding in household appliances, security equipment, public electrical facilities and other places. Scanning and data collection of external human body signals by infrared pyroelectric equipment, transmitting the collected data to the single-chip microcomputer, transmitting data to the WiFi module by the single-chip microcomputer, transmitting the device status to the user by using the wireless signal, and controlling the relay module by using the single-chip microcomputer, Switch the device to control. In summary, in order to design an internal embedded module for other devices, it is required to meet the requirements of small production volume, wide sensing range, and high sensitivity. Figure 1 Infrared pyroelectric control module This paper mainly uses household appliances as the embedded experimental object, and inserts the infrared pyroelectric scanning module into the device to observe whether the switching reaction can be accurately made. The entire module uses the STM8 model microcontroller as the core controller. The module uses the STM8 type MCU as the control core. By programming the MCU, the infrared pyroelectric module is used to sense the infrared heat source in the room. When the pyroelectric sensor senses the human body heat source signal, the MCU drives the relay module. The embedded device performs switching control, and the WiFi module sends the running state of the device to the upper computer, and the user can perform operation and regulation on the device through the upper computer program. The control function of this module is shown in Figure 1. The operational amplifier and digital-to-analog signal conversion device used in the module shown in Figure 1 can be selected by comparison, and the operational amplifier and digital-to-analog conversion circuit can be reasonably selected, which can effectively improve the induction accuracy of infrared pyroelectricity and reduce the error. produce. The design module of this paper needs to be small and easy to embed. The designed hardware circuit needs to adopt a device with higher integration. This section will design the hardware model and circuit used by the module. The design of each basic unit is as follows. 2.1STM8 microcontroller basic unit In this paper, STM8 type MCU is used as the main control chip of the scanning module. The main connection of the pin is shown in Figure 2. In addition to other peripheral working modules, this module also designs the peripheral reset circuit of the MCU. When the reset button is pressed, the whole module Will be reset, the infrared pyroelectric module will be reset, the WiFi module will also stop sending and receiving data, but in order to ensure the safety of the electrical appliances, the relay module will also shut down the control appliance. Crystal head is an important interface equipment in network connection. It is a kind of plastic joint which can be inserted along the fixed direction and can automatically prevent falling off. It is used for network communication. It is named "crystal head" because of its crystal like appearance. It is mainly used to connect network card port, hub, switch, telephone, etc. The two ends of each twisted pair are connected with network card and hub (or switch) by installing crystal head. Modular Plug ShenZhen Antenk Electronics Co,Ltd , https://www.antenkconn.com
