4 PIN Infrared Speed Sensor

The 4-Pin Infrared Speed Sensor Module is a compact photoelectric sensing device used for detecting rotational speed, object movement, and pulse counting in electronic and robotics applications. It operates using an infrared transmitter and receiver pair to detect interruptions or reflections caused by moving objects such as encoder disks, wheels, or rotating shafts. 4-Pin Infrared Speed Sensor Module. The module is commonly used with microcontrollers such as Arduino, ESP32, Raspberry Pi, and other embedded systems for RPM measurement, motor speed monitoring, and automation projects. It provides a digital output signal that changes state when an object passes through or interrupts the infrared beam.