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3.1 Introduction

In this module, we will learn to make Obstacle Avoider Robot.

An obstacle avoider robot is based on the principle of transmitting and receiving of ultraviolet rays.In this project we will use ultrasonic sensor which have one trigger and echo pin.The trigger pin transmits the ultrasonic sound waves and which is reflected back by the object and received by the Echo pin.An ultrasonic sensor is an electronic device that measures the distance of a target object by emitting ultrasonic sound waves, and converts the reflected sound into an electrical signal.

In this obstacle avoiding car, the car moves forward until the ultrasonic sensor detects any object or wall in less then 25cm away.If the distance is less than 25cm then the car will move towards left and then again the ultrasonic sensor will check for the obstacle and if again it detects any obstacle then again the car will move towards left and it will go on.