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Digital Tachometer RPM , Speed or Pulse counting Sensor Module. Can be used with Arduino, Raspberry Pi and other microcontroller boards.Applications:RPM Sensing, Speed SensingAs Home and End limit sensor in CNC machinesPosition Detection SensorPulse countingFeatures:Output state indicator LED (LED ON means No obstruction)Power state indicator LED3.3V and 5V logic level compatibility4 pin standard male header for interfacing with electronicsA fixed hole for easy installationBuilt in LM393 comparator for perfect non-intermediate logic low and high outputThe use of quality coupler slot sensorTechnical Specifications:Operating voltage: 3.3V-5VMaxim Output Drive: 15mADigital Output (DO) Output Low : When No ObstructionDigital Output (DO) Output High: When ObstructedAnalog Output: Near 0V when no obstruction, between 0V and VCC when less obstruction and Near VCC when full ObstructionHeader Pitch: Standard 0.1 inch (2.54mm)Grove width : 5mmPCB Size: 3.2cm x 1.4cmMounting Hole Diameter: 3.0mmPinouts:1.VCC2.GND3.DO (Digital Out)4.AO (Analog Out)Package Includes:1x Digital Tachometer RPM or Speed Sensor Module – FZ0888