Aiming at status that most compact cars and trucks are lack of reversing radar due to cost constraints

design a low-cost simple structure reversing radar warning system with high reliability. Hardware design consists of ultrasonic wave distance measurement circuit

LCD display circuit

alarm circuit. Software design consists of introduction of ultrasonic ranging principle and workflow of software system. In the process of reversing

the system can detect distance between car and obstacle and display distance on LCD in real time. Once the distance exceeds the preset warning threshold

the audible and visual alarm will be triggered to warn the driver. Experimental results show that the proposed system can achieve correct ranging value of the distance and the maximum average error is not exceed 3 %

the system is also characterized by lower energy consumption and well performance.