"基于51单片机的智能防盗报警系统设计与优化"

The intelligent anti-theft alarm system based on the 51 single-chip microcomputer is designed using a pyroelectric infrared sensor, which has been upgraded to improve the simplicity, stability, and anti-interference capability of the home anti-theft alarm system. It also has the advantages of strong sensitivity and concealment, greatly improving the user's anti-theft measures. The system consists of hardware and software components. The hardware part is composed of the STC89C51 single-chip microcomputer as the intelligent control device, the HC-SR501 human body pyroelectric sensor as the detection component, a buzzer, and LED as the alarm components, and a common cathode digital display for distinguishing system operation mode. The software part includes schematic and circuit board design using DXP 2004, simulation and debugging using Proteus 7.8, and code writing and system operation mode differentiation using Keil μVision5. The system includes three modes: emergency alarm mode, deployment mode, and disarm mode. The emergency alarm mode keeps the system in a constant alert state, the deployment mode allows the system to function normally and detect if anyone enters the alarm area, and the disarm mode puts the system in standby mode with no effect. This system has the advantages of simple control, small size, high reliability, strong specificity, and low cost. Keywords: infrared pyroelectric sensor, STC89C51 single-chip microcomputer, anti-theft alarm.