AJMRTC 5Pcs LM393 Opposite-Type Infrared Correlation Photoelectric Count Sensor Module, Slotted IR Beam Interruption Detector with Digital Output for Speed Measurement, Object Counting, Arduino DIY

AJMRTC correlation photoelectric sensor module is a slotted infrared interrupter sensor built around the LM393 comparator chip. It has an infrared emitting diode and a receiving tube placed face to face on both sides of the U-shaped slot. When an object passes through and blocks the infrared beam, the sensor outputs a digital switching signal for the MCU to capture. With the LM393 comparator circuit, the module filters minor signal noise and provides sharp, reliable trigger edges to avoid misreading during high-speed counting. An onboard indicator LED lights up to show whether the infrared path is connected or blocked, making wiring and debugging much easier. It supports both 3.3V and 5V power supply, compatible with Arduino, ESP32, Raspberry Pi, STM32 and other development boards. This sensor is widely used for motor RPM detection, conveyor object counting, rotary encoder measurement, position limit switch and automatic induction circuits. The module comes with pre-soldered pin headers for quick plug-in on breadboards. This package contains 5 sensor modules to satisfy multi-channel testing, batch DIY and equipment replacement needs.

Specifications

Brand: AJMRTC

Chip: LM393 Voltage Comparator

Sensor Type: Opposite-Type Correlation Infrared Photoelectric Sensor

Detection Method: IR Beam Blocking Trigger

Output Signal: Digital TTL Level

Working Voltage: DC 3.3V ~ 5V

Indicator: Onboard Status LED

Slot Width: 10mm

Compatible Controller: Arduino, Raspberry Pi, ESP32, STM32

Application: Object Counting, Motor Speed Test, Position Limit Detection, Automation Experiment