Whadda WPSE347 IR Speed Sensor Module

The Whadda WPSE347 is a LM393 speed sensor module, widely used in motor speed detection, pulse count, and position control.

The sensor is very easy to operate: To measure the speed of a motor, make sure the motor has a disk with holes. Each hole should be equally spaced on the disk. Every time the sensor sees a hole, it creates a digital pulse on the D0 pin. This pulse goes from 0V to 5V and is a digital TTL signal. If you capture this pulse on a development board and calculate the time between the two pulses, you can determine the revolutions speed: (time between pulses X 60)/number of holes.

For example, if you have one hole in the disk and the time between two pulses is 3 seconds, you have a revolutions speed of 3*60 = 180 rpm. If you have 2 holes in the disk, you have a revolutions speed of (3*60/2) = 90 rpm.

• 4 pin connector: analogue out, digital out, ground, vcc
• LED power indicator
• LED indicator of the output pulses at D0
• Working voltage: 3.3 to 5 VDC
• Groove width: 5 mm
• Weight: 8 g
• Dimensions: 32 x 14 x 7 mm (1.26 x 0.55 x 0,27")