Encoder Module

Product details:

The Keyes KY-040 rotary encoder is a rotary input device (as in knob) that provides an indication of how much the knob has been rotated AND what direction it is rotating in.It’s a great device for stepper and servo motor control. You could also use it to control devices like digital potentiometers.

Specification:

Working voltage: 5V
Circle of Pulses: 20

Package included:

1 x Encoder Module

Pin-out:

Example:

http://henrysbench.capnfatz.com/henrys-bench/arduino-sensors-and-input/keyes-ky-040-arduino-rotary-encoder-user-manual/