Waveshare Photo Interrupter Sensor, Speed Measuring

Overview
1. Infrared detection, eliminating the interferences of external stray light
2. Schmitt trigger, stable wave form and signals
3. Signal output indicator (while breaking the beam, outputs low level, the indicator lights up)

Specifications
1. Power: 3.3V ~ 5V
2. Dimension: 26.8mm × 15mm × 18.7mm
3. Mounting holes size: 3mm
4. Gap width: 6mm

Applications
- Motor speed detection
- Pulse counter

How to Use
In the case of working with a MCU:
- VCC ? 3.3V ~ 5V
- GND ? GND
- DOUT ? MCU.IO (digital output)