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The WPSE347 is a LM393 speed sensor module that is often used for engine speed detection, pulse counting, position control, etc.The sensor is very easy to use: To measure the speed of a motor, make sure the motor has a disc with holes. Each hole should be evenly distributed on the disc. Every time the sensor sees a hole, it generates a digital pulse on the D0 pin. This pulse goes from 0 V to 5 V and is a digital TTL signal. If you record this pulse on a development board and calculate the time between the two pulses, you can determine the speed: (Time between pulses X 60) / number of holes.For example, if you have a hole in the plate and the time between two pulses is 3 seconds, you have a speed of 3 * 60 = 180 rpm. If you have 2 holes in the disc, you have a speed of (3 * 60/2) = 90 rpm.Properties:4-pin plug: Analogue output, digital output, ground, VCCLED power indicatorOutput pulse LED at D0SpecificationsWorking voltage: 3.3 to 5 VDCGroove width: 5 mmWeight: 8 gDimensions: 32 x 14 x 7 mm (1.26 x 0.55 x 0.27 inch)This text is machine translated.