Ultrasonic Radar Object Detection


RADAR is an object detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. Arduino is a single-board micro controller to make using electronics in multidisciplinary projects more accessible. This project aims at making a RADAR that is efficient, cheaper and reflects all the possible techniques that a radar consists of. this radar works by measuring a range from 3cm to 40 cm as non-contact distance, with angle range between 15˚ and 165˚. The movement of the sensor is controlled by using a small servo motor. Information received from the sensor will be used by “Processing Development Environment” software to illustrate the result on a PC screen.

fig. Circuit Diagram


Arduino control the servo motor in angle between 0 to 180 degree. On this servo motor we are putting ultrasonic sensor which is connected to the Arduino board. Ultrasonic sensor work on the trigger and echo pulse. As per object distance it will generate echo pulse. If object is having less distance than threshold distance saved in program then program will find out the angle of servo motor.

The ultrasonic sensor gets back the echo pulse when the transmitted pulse collide with any object with in its range. Then it processes the sound signal and converts it into the electrical pulse and transmits it to the micro-controller through ‘echo’ pin . Micro-controller processes it and further it displays the presence of any object or creature between 3 to 40 cm distance with the angle of its presence. It is detected by red lines in the  RADAR screen.

fig. Radar Monitor Screen (made with processing software)

By: Amit Kumar Padhi

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