【摘要】 介绍一种由AT89C2051控制、利用超声波敏感器件作为发射与接收装置并依据多普勒效应制作的汽车防盗报警系统。使用时把此系统安装在汽车驾驶室内,当有人非法进入车内时,报警系统开始报警并且能够切断汽车点火电路。更多还原

【Abstract】 An intruder alarm system controlled by AT89C2051 is introduced here.Based on the Doppler effect’ the ultrasonic sensing heads as T/R devices is utilized.When somebody breaks in the car’ the system begins to alarm and cuts off the ignition circuit.更多还原