Ultrasonic Distance indicator using 8051 Based Microcontroller

Ultrasonic Distance indicator It detects any object ahead of the ultrasonic transducer by using an emitter for sending 40 kHz sound wave; and a detector that detects this 40 kHz sound wave and sends the signal back to the microcontroller. if distsnce is less than set value then is active the buzze to inform the user Which use in reverse car parking to avoide damage of car