Prototype of automatic parking aid based on microcontroller AT89S52

It has been made a device that could help driver from accidents when parking a car. The driver knows the range of the vehicle and any object behind. Moreover, the informing device should help to break the machine down automatically. This device used ultrasound as range finder, microcontroller AT89S52 as processes calculation and displays result in LCD screen. This calculation is also used for managing buzzer and relay as the actuator. In this experiment, device has been simulated by toy car which run reversely to object behind. On any ranges, buzzer sound would sign actively, and it continued to break the electric current of the vehicle if it was still running. The result showed that the device could perform appropriately and could calculate 3 cm of minimum range and 330 cm of maximum range to object. The sound of buzzer was active in caution and critical range, that is 200 cm to 3 cm, and the machine of vehicle broke down in a critical range under 20 cm.