LM393 IR Speed Sensor Module

The LM393 IR Speed Sensor Module is a digital optical sensing unit designed for motor speed measurement, pulse counting, and position limit detection. It utilizes a 5 mm slot-type infrared optocoupler and an LM393 comparator to generate a clean digital output signal (0/1) compatible with microcontroller I/O. Operating from 3.3–5 V, the module provides stable waveform output with driving capability above 15 mA. The onboard status LED indicates output state, and the PCB measures 32 × 14 mm with a mounting hole for secure installation. It can interface directly with controllers, relays, limit switches, and alarm modules.

Features

Slot-Type Infrared Optocoupler | 5 mm detection gap for object interruption sensing

LM393 Comparator | Clean digital output with stable waveform

Digital Output Interface | Direct connection to microcontroller I/O (0/1 logic)

Operating Voltage | 3.3–5 V supply compatibility

Output Drive Capability | Greater than 15 mA sink current

Status Indicator LED | Displays output state in real time

Mounting Hole | Mechanical fixation for panel or chassis installation

Application Support | Suitable for speed measurement, pulse counting, and limit detection

Specifications

Operating Voltage | 3.3–5 V

Output Type | Digital switch output (0/1 logic)

Comparator | LM393 wide-voltage comparator

Output Drive Current | >15 mA sink capability

PCB Dimensions | 32 × 14 mm

Mounting | Single fixing hole for mechanical installation

Sensor Type | Slot-type infrared optocoupler

Detection Gap Width | 5 mm

Output Indication | Onboard LED status indicator

Signal Characteristics | Clean digital waveform from comparator

Interface | Direct connection to microcontroller digital I/O, relay, or limit switch

Links

- LM393 Datasheet

- IR Speed Sensor Hookup Guide

- 3D model from grabcad.com

Tutorials

- Use LM393 IR Module as Motor Speed Sensor - teachmemicro.com