IR-Speed-Sensor-Module-Whadda-WPSE347-p-The-Whadda-WPSE347-is-a-LM393-speed-sensor-module-widely-used-in-motor-speed-detection-pulse-count-&-position-control-p-p-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-&-is-a-digital-TTL-signal-If-you-capture-this-pulse-on-a