Slot Type IR Optocoupler Speed Sensor Module for Arduino and MCU Projects
Optical Speed Measuring Module for Motor Speed, Pulse Counting, and Position Detection
This slot-type IR optocoupler speed sensor module is a compact and reliable optical detection module designed for accurate speed measurement, pulse counting, and position sensing. Based on the LM393 comparator and an infrared optocoupler, it provides a clean digital output for seamless integration with Arduino, AVR, PIC, and other microcontrollers [citation:1][citation:3][citation:10].
Accurate and Reliable Detection Uses an infrared LED and phototransistor for noncontact optical interruption detection [citation:2][citation:5].
Clean Digital Output Equipped with an LM393 comparator and Schmitt trigger for stable, noiseresistant TTL signal output [citation:1][citation:2][citation:3].
Operating voltage is 3.3V to 5V DC, compatible with both 3.3V and 5V logic systems [citation:1][citation:2][citation:10].
The output logic is active LOW: the output is LOW when the beam is unobstructed, and HIGH when the beam is interrupted [citation:2][citation:7][citation:10].
The module outputs a digital signal only (DO); the AO pin is typically non-functional [citation:1][citation:6][citation:7].
Technical Specifications
| Parameter | Value |
|---|
| Main Chip | LM393 comparator [citation:1][citation:3][citation:10] |
| Operating Voltage | 3.3V to 5V DC [citation:1][citation:2][citation:10] |
| Output Signal | TTL Digital (HIGH/LOW) [citation:1][citation:2][citation:10] |
| Slot Width | 5mm to 10mm (typical 5mm) [citation:1][citation:6][citation:10] |
| PCB Size | ~31mm x 14mm (varies by version) [citation:1][citation:11] |
| Mounting | M3 screw mounting holes [citation:1][citation:2][citation:10] |
= Key Features =
+LM393 Comparator ensures stable, clean signal with high drive capability (>15mA) [citation:3][citation:6][citation:11].
+Infrared SlotType Optocoupler offers robust antiinterference performance [citation:3][citation:10].
+Onboard Status LED visually indicates output logic state [citation:7][citation:10].
+DO output interface allows direct connection to MCU I/O ports for sensor block detection and motor speed monitoring [citation:1][citation:11].
+M3 bolt holes enable simple and secure mounting on any chassis [citation:1][citation:2][citation:10].
+Power indicator LED shows module status.
= Applications =
- Motor speed detection using an encoder disc [citation:1][citation:2][citation:3].
- Pulse counting and rotation measurement [citation:4][citation:10].
- Position limit sensing and object detection [citation:3][citation:7][citation:11].
- Relay and buzzer triggering as part of an alarm or limit switch system [citation:1][citation:3][citation:11].
- Robotics, automation, and industrial control projects [citation:3][citation:10].
Reliable and Easy to Use - Digital output simplifies integration with any microcontroller.
Versatile Applications - Suitable for speed measurement, RPM detection, object counting, and more [citation:4][citation:10][citation:11].
√ Compatible with Arduino, Raspberry Pi, ESP32, STM32, 51 Series, AVR, and PIC microcontrollers [citation:4][citation:11].
√ Wide voltage range for flexible operation [citation:1][citation:2].
√ M3 mounting holes for secure installation [citation:1][citation:2].
√ Includes power and output LEDs for immediate status feedback [citation:7][citation:10].
Troubleshooting
No output signal:
- Verify VCC and GND connections.
- Ensure the module is powered within 3.3V to 5V.
- Check the DO pin connection to the microcontroller input.
Inconsistent or unreliable readings:
- Ensure the encoder disc or object passes cleanly through the slot.
- Verify the slot and optocoupler are free from dust or debris.
- If using a long cable, ensure it is shielded to avoid interference [citation:12].