"基于单片机的双向汽车防盗系统设计与实现"

The design of two-way car anti-theft system based on single-chip microcomputer is becoming increasingly important as people's living standards improve and cars become more prevalent in households. The continuous development of wireless technology has made anti-theft system design more flexible, secure, convenient, and reliable. This article mainly introduces a two-way car anti-theft system designed based on LPC930 single-chip microcontroller and TDA5255 wireless transceiver module, consisting of a remote control and a main unit. The remote control and main unit communicate in half-duplex mode, with the remote control controlling the status of the main unit, including arming, disarming, finding the car, opening the tailgate, and synchronously alarming with the main unit. The main unit can detect multiple triggering sources and automatically alarm while synchronously notifying the remote control. It can execute corresponding functions based on the remote control settings and has functions such as automatic locking and unlocking, central locking automation, automatic recovery, and emergency disarm. A custom wireless communication protocol is used, with protocol data encoded using PWM modulation and using FSK modulation and demodulation. Software implementation is done using C language programming and Keil compilation environment. Key words: LPC930, TDA5255, PWM, FSK modulation and demodulation.