Opto-Interrupter Speed Detection Module

LM393 Speed Sensor Detection Speed Module For Arduino
Price: $5.50

Working voltage: 3.3V~5V Weight: 8g Dimensions: Approx.3.2 x 1.4 x 0.7cm 5mm Groove width Using wide voltage LM393 comparator Application: Widely used in dynamo speed detecting, pulse counting, etc Output form: Digital switch output (0 and 1) and Analog for Sensitivity.