The encoder disk in this sensor kit is laser etched steel and features 100 slots. The sensor is powered with 5VDC and outputs 5/3.3v logic safe outputs. As the disc rotates through the sensor, the sensor’s infrared LED is visible to the phototransistor on the opposite side. There are two different output pins on the sensor: The yellow wire outputs a pulse high at the precise moment of the transition, while the blue wire outputs a signal high the entire duration the led is visible.

Pinout:
Red: 5VDC
Black: GND
Blue: Digital Out 1
Yellow: Digital Out 2