Sparkfun Electronics Rotary Encoder - 200 PR (Quadrature)

This Rotary Encoder - 200 P\R (Quadrature) outputs gray code which you can interpret using a microcontroller and find out which direction the shaft is turning and by how much. This allows you to add feedback to motor control systems. Resolution: 200 Pulse/Rotation; Input Voltage: 5 - 12VDC; Maximum Rotating Speed: 5000rpm