Wireless Alarm System Basing on CPLD and Micro-controller

Making use of programming characteristic and rich inner resource of CPLD(Complex Programmable Logic Device),a wireless alarm sending system was designed,which include address encoding circuit,FSK modulate signal and each channel controller signals to decrease volume and increase reliability of the system.With the help of an ASIC MC3372 to demodulate and a Micro-controller 89C51 to decode the address signal in receiving system,a decoder is designed.These means,combining with some anti-interference methods,have effectively decreased the error-alarm rate.Experiments show that the wireless alarm system has the virtue of high reliability,high anti-disturbance ability and low error-alarm rate to meet the needs of alarm for fireproofing and guard against theft etc.