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The main aim of the investigation is to develop automatic speed control by using ultrasonic sensor system. Whenever any obstacle is detected in running vehicle depends on distance automatically control the speed of vehicle. The ultrasonic sensor system continuously sends signals and monitors the obstacles in front of car. The distance up to which ultrasonic sensor can work may be up to 8 meters. When any obstacle detected by ultrasonic sensor system it will send signal to the embedded board. After receiving this signal to embedded board it sends signal to the motor to reduce the car speed automatically. Vehicle is controlled automatically without any manual operation when the vehicle is at eight-meter distance away from the front. Input signals given to the microcontroller from the sensors and then the controller takes the appropriate action according to the program written in it and drives motors as desired.
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