What is an Encoder ?
An encoder is an electro-mechanical device used to convert the mechanical position of a shaft or axle to an analogue or digital electrical signal.
The analogue or digital signal can then be used to determine position,direction, and velocity of the shaft or axle.
The optical encoder has become the most popular of these encoding methods
1.Its long life 2.Simplicity of construction 3. Versatility 4.High accuracy and high resolution