Edge Detector

Components:

• Arduino Uno
• Chassis & wheels(2)
• Caster
• Mini Breadboard
• Ultrasonic sensor
• Motor driver L293D
• BO Motor(2)
• Battery with battery holder
• Jumper wires
• Scale

Explanation:
The ultrasonic sensor is used for measuring distance. The sensor there is a pin called Echo which sends ultrasonic waves .The waves go in vertical direction, if there is an obstacle they are reflected . The trig pin detects the reflected waves. The arduino calculates the distance .Code is written in such a way ,when the distance is less 5 ,the robot moves forward.