"基于单片机的热释电防盗报警系统设计与实现"

The research paper titled "The PIR Detector based Anti-theft Alarm System using Microcontroller" from Shaanxi University of Technology provides a comprehensive study on the design and implementation of a PIR detector-based anti-theft alarm system. The paper focuses on both hardware and software aspects of the system, including the selection of core chips, peripheral circuit connections, inter-chip connection circuits, programming methods, and corresponding software. The system is powered by a 7805 and 7809 chip to output 5V and 9V voltages, controlled by a stabilizing module. The design follows a modular approach, with the main controller utilizing an AT89C51 microcontroller to automatically monitor analog signals (such as infrared signals emitted by humans and vibration signals) from PIR sensors and vibration displacement sensors in residential areas. Upon detecting any abnormality, the system generates a digital signal input to the microcontroller, which triggers the alarm from a buzzer to initiate appropriate responses. The reset circuit features a low-power, four-pin IMP812 monitoring chip. The system's hardware circuit is simple, easy to install and operate, cost-effective, and suitable for various types of residences and populations. Key words: sensor; microcontroller; alarm system.