What is a Caster wheel and how to use it in your Line Follower Robot

What is Caster Wheel:

A Caster wheel is an undriven, single wheel that is designed to be mounted to the bottom of a larger object so as to enable that object to be easily moved. They are available in various sizes, and are commonly made of rubber, plastic, nylon, aluminum, or stainless steel, etc.

Why use a caster wheel in Line Follower Robot :
While making a robo car we need to put four normal wheels, but only two (mostly rear wheels) of them are connected with the motors, other two are free or dummy wheels. In case we put the normal wheels, we need to make a steering mechanism also. To avoid this steering mechanism and adding dummy wheels we use caster wheels which are free to rotate in any direction as per the movement of rear wheels.

How to use a caster wheel on your Line Follower Robot:
Only one caster wheel is required on the front. It can be connected with the chassis using nuts and bolts.