Oiyagai LM393 speed sensor module 5pcs Slot Type IR Optocoupler

Description

Product Overview

The Oiyagai LM393 speed sensor module is engineered to deliver precise motor speed detection for a wide range of electronic projects. Built around the reliable LM393 comparator chip, each module integrates a slot‑type infrared optocoupler that isolates the sensing circuit from noisy motor environments, ensuring clean and consistent signal output. The compact printed circuit board measures 33 × 14 mm (1.3 × 0.55 inches) and is fabricated from high‑quality FR‑4 material, providing durability while keeping the overall weight under 4 grams. Operating voltage ranges from 3.3 V to 5 V DC, making the sensor compatible with popular development platforms such as Arduino, Raspberry Pi, ESP32, and other microcontroller families. The design includes a 5 mm wide slot and a 3 mm mounting hole, allowing straightforward integration onto prototype boards or custom PCBs without the need for additional adapters.

Each package contains five identical sensor modules, giving engineers the flexibility to monitor multiple motors or to create redundant measurement channels for safety‑critical applications. The infrared optocoupler works by emitting a focused beam of infrared light across the slot; when a rotating motor gear or a reflective marker passes through, the beam is interrupted, and the LM393 comparator translates this interruption into a clean digital pulse. This pulse can be counted by a microcontroller to calculate revolutions per minute (RPM) with high accuracy, even in high‑speed or high‑vibration scenarios. The sensor’s low power consumption, typically under 10 mA, ensures that battery‑powered projects retain long operational life.

Beyond basic speed measurement, the module’s fast response time and adjustable threshold make it suitable for a variety of signal‑conditioning tasks, such as detecting shaft position, monitoring conveyor belt movement, or providing feedback for closed‑loop control systems. The robust construction, combined with the proven LM393 architecture, offers a reliable solution that withstands temperature variations from –20 °C to +85 °C, meeting the demands of industrial prototyping and educational laboratories alike. Detailed specifications include a PCB size of 33 × 14 mm, a slot width of 5 mm, a hole size of 3 mm, and a net weight of 4 g per module, all of which contribute to a compact yet powerful sensing package.

Usage

The sensor module excels in hobbyist robotics, where precise wheel speed feedback is essential for navigation algorithms and obstacle avoidance. By mounting the slot‑type sensor on a robot’s wheel hub, developers can obtain real‑time RPM data that feeds directly into PID controllers, enabling smooth acceleration and deceleration profiles. In drone applications, the lightweight nature of the module allows it to be placed on motor shafts without significantly affecting the overall mass balance, providing valuable data for flight stabilization and performance tuning. The module’s ability to operate at both 3.3 V and 5 V logic levels means it can be paired with a wide variety of flight controllers, from simple Arduino‑based boards to more sophisticated Pixhawk or Betaflight systems.

Industrial engineers can also leverage the module for conveyor belt monitoring, where the infrared slot detects passing items or markers, translating physical movement into digital counts for inventory tracking or quality‑control systems. The 5 pcs package is ideal for multi‑axis machines, allowing each axis to be equipped with its own dedicated speed sensor, simplifying wiring and reducing latency compared to a single shared sensor. The module’s compatibility with both 3.3 V and 5 V logic levels ensures seamless integration with existing control boards, while its simple three‑wire interface (VCC, GND, OUT) minimizes wiring complexity. Installation tips include securing the sensor with the provided 3 mm mounting hole, aligning the slot perpendicular to the direction of motion, and using a small piece of reflective tape on the rotating element to improve detection reliability under varying lighting conditions.

Why Choose Us

Choosing the Oiyagai LM393 speed sensor module means selecting a product that combines proven semiconductor technology with thoughtful mechanical design. The LM393 comparator has a long history of reliability in industrial applications, and Oiyagai has optimized its layout to reduce electromagnetic interference, delivering a clean output even when mounted near high‑current motor wires. Each module undergoes rigorous quality testing, including functional verification at multiple voltage levels and environmental stress screening, guaranteeing consistent performance across all units. The sensor’s design also incorporates a protective epoxy coating over the optocoupler, shielding it from dust and moisture, which extends its service life in harsh environments.

In addition to the hardware advantages, Oiyagai provides comprehensive technical support, offering detailed datasheets, wiring diagrams, and example code snippets for popular development environments. Customers benefit from a responsive after‑sales service team that can assist with integration challenges, firmware tuning, or troubleshooting unexpected behavior. With a competitive price point of $11.99 for a five‑unit pack, the module delivers exceptional value for both large‑scale prototyping programs and individual makers seeking reliable speed measurement without breaking the budget. Oiyagai also offers a 90‑day warranty and a hassle‑free return policy, reinforcing confidence in product durability and long‑term support.

Key Features

• Five slot‑type IR optocoupler modules in one pack, reducing component count and simplifying inventory management.
• LM393 comparator provides fast, noise‑immune digital output for accurate RPM calculation even in high‑vibration environments.
• Compact 33 × 14 mm PCB with low weight (4 g) fits easily onto prototype boards and space‑constrained projects.
• Wide operating voltage range (3.3‑5 V DC) ensures compatibility with Arduino, ESP32, Raspberry Pi, and other microcontrollers.
• Dedicated Oiyagai technical support and after‑sales service guarantee assistance throughout product integration and beyond.

FAQ

What voltage should I supply to the sensor?

The module operates reliably between 3.3 V and 5 V DC. Supplying voltage within this range ensures the LM393 comparator functions correctly and the infrared optocoupler receives sufficient power for stable operation.

How does the infrared slot detect motor speed?

When a rotating element such as a gear tooth or a reflective marker passes through the 5 mm slot, it interrupts the infrared beam. The LM393 comparator converts each interruption into a digital pulse, which a microcontroller can count to determine revolutions per minute.

Can I use the sensor with a 5 V Arduino Uno?

Yes. The sensor’s output is compatible with 5 V logic levels, so you can connect the VCC pin to the Arduino’s 5 V supply, GND to ground, and the OUT pin to any digital input pin for pulse counting.

Is the module suitable for high‑speed motors?

Absolutely. The LM393 comparator’s fast response time and the sensor’s low latency allow it to accurately track speeds up to several thousand RPM, making it appropriate for high‑performance motor applications.

What kind of support does Oiyagai provide after purchase?

Oiyagai offers a dedicated technical support portal, detailed documentation, and example firmware for popular platforms. Users can also contact the support team via email or phone for troubleshooting, and the company provides a 90‑day warranty covering manufacturing defects.