R40.01

The LM393 Mini Speed Sensor Module is an infrared optical sensor designed to detect rotational speed, movement and interruptions in a light beam.

It uses an infrared transmitter and receiver with an LM393 comparator to produce a digital output signal. Ideal for Arduino, robotics, motor speed measurement, wheel encoders and DIY electronics projects.

Technical Specifications

Specification	Details
Sensor Type	Infrared optical slot sensor
Comparator IC	LM393
Operating Voltage	3.3V – 5V DC
Output Type	Digital (HIGH/LOW)
Output Pins	DO, VCC, GND
Detection Method	Infrared beam interruption
Slot Width	Approx. 5 mm
PCB Size	Approx. 32 × 14 mm
Indicator LEDs	Power and output status
Compatibility	Arduino, ESP32 and microcontrollers
Speed Measurement	Depends on encoder disc and controller

Pin Connections

VCC: 3.3V–5V DC power supply
GND: Ground (negative)
DO: Digital signal output

Applications

Motor RPM measurement
Robot wheel speed detection
Encoder disc counting
Rotation monitoring
DIY robotics and school projects

The sensor requires a compatible encoder disc or rotating slotted wheel to measure RPM. An Arduino or other controller counts the pulses to calculate speed.

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