A speed sensor, also known as a tachometer sensor, is a device that is used to measure the rotational speed of a machine or engine. It typically consists of a rotor with a series of slots or holes around its circumference, and a sensor that is positioned adjacent to the rotor. As the rotor rotates, the sensor detects the passing slots or holes and generates a pulse signal. The frequency of the pulse signal is proportional to the speed of the rotor. A slot-type optocoupler is a type of sensor that uses an optical coupling mechanism to isolate the sensor from the rotor. It is often used in high-speed or harsh environments where electrical noise or interference is a concern. Use this module as either a speed sensor or a tacho-counter. Widely used in motor speed detection, pulse counting, position limit and so on.Module features:1, the use of imported groove coupler sensor, slot width 5mm.2, output status indicator lamp output high, output low lights.3, block, output high; no shelter, output low.4, the comparator output signal clean, good waveform, driving ability, than 15mA.5, the working voltage of 3.3V-5V6, the output format: digital switching output (0 and 1)7, a fixed bolt holes for easy installation8, small PCB board size: 3.2cm x 1.4cm9, using a wide voltage comparator LM393
