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Waveshare RF4 Photo Interrupter Sensor + Robot Speed Measuring Module
Photo Interrupter Sensor£¬ robot speed measuring module Overview Infrared detection£¬ eliminating the interferences of external stray light Schmitt trigger£¬ stable wave form and signals Signal output indicator (while breaking the beam£¬ outputs low level£¬ the indicator lights up) Specifications Power: 3.3~5V Dimension: 26.8mm * 15mm * 18.7mm Mounting holes size: 3mm Gap width: 6mm Applications: Motor speed detection£¬ pulse counter How to Use: VCC ↔ 3.3V ~ 5V GND ↔ GND DOUT ↔ MCU.IO (digital output)