This tutorial details the construction of a simple and low cost robot. The robot is mainly a line follower but can also be used as a photovore, a photophobe, and obstacle avoider!And all this for less than 40$. The best part is that the robot does not use any microcontroller, which means you need no expensive programmer or even a computer to program your robot. This tutorial is mainly aimed at beginners, hence I have tried to keep the robot as simple and cheap as possible. With only a few parts you can get this robot up and going. Here is a video of the robot following black line.
• The sensor used are four LDRs and LEDs.
• The steering method used here is differential drive.
• The actuators used are two 100 rpm DC motors.
• One 9V battery provides power to the robot.
• The robot can follow a dark line on a light surface or a light line on a dark surface.
• A LED is switched on when the robot is on the line (this makes things easier during debugging).
• It can also be used as a photovore, photophobe, and obstacle avoider.