Comparator Speed Sensor LM393 by DAOKAI – 10PCS Slot IR Optocoupler

Description

Product Overview

The DAOKAI LM393 Comparator Speed Sensor Module is engineered for precise motor speed measurement in a variety of industrial and hobbyist applications. Each package contains ten identical sensor boards, each measuring just 33 × 14 mm, making them easy to mount on tight PCBs. The module utilizes a high‑quality imported groove coupler sensor that provides a clean, noise‑free TTL output. Operating voltage ranges from 3.3 V to 5 V, and the comparator can source up to 15 mA, ensuring reliable signal transmission even in demanding environments. The board features a simple pin layout: VCC for power, GND for ground, and DO for the digital output, while the AO pin is not used. This straightforward design reduces wiring complexity and speeds up development cycles.

Usage

This sensor module excels in applications that require real‑time speed monitoring, such as CNC spindle speed control, robotic joint feedback, conveyor belt monitoring, and hobbyist motor projects. Its slot‑type IR design allows it to be placed directly on a rotating shaft or a moving belt, where the slotted wheel interrupts the infrared beam to generate pulse signals. These pulses can be counted by an Arduino, ESP32, or any microcontroller equipped with interrupt capabilities, enabling precise RPM calculations. The module is also suitable for pulse counting, position limit detection, and other timing‑critical tasks in automation systems. Its low power consumption and compact footprint make it ideal for battery‑operated devices and portable equipment.

Why Choose Us

Choosing the DAOKAI LM393 module means selecting a product backed by rigorous quality control and a reputation for reliability in the industrial and scientific market. The sensor’s comparator output is designed to deliver a clean waveform with minimal jitter, reducing the need for additional filtering circuitry. Each unit undergoes functional testing to verify voltage tolerance, output consistency, and mechanical durability. DAOKAI provides responsive technical support and a clear warranty policy, ensuring that any integration challenges are promptly addressed. Our customers benefit from detailed documentation, example code for popular platforms, and a community of users who share best practices and troubleshooting tips.

Key Features

• Compact 33 × 14 mm PCB size fits tight spaces and simplifies board layout.
• High‑quality IR optocoupler delivers clean TTL output for accurate speed measurement.
• Wide operating voltage range (3.3‑5 V) compatible with most microcontroller platforms.
• Low power consumption with up to 15 mA drive capability for reliable signal transmission.
• Dedicated technical support and comprehensive documentation for hassle‑free integration.

FAQ

What voltage range does the sensor support?

The module operates safely between 3.3 V and 5 V, making it compatible with common development boards such as Arduino Uno, Nano, Mega, and ESP32.

Can the sensor be used for pulse counting?

Yes, the digital output (DO) provides a clean TTL pulse each time the infrared beam is interrupted, which can be counted by a microcontroller to determine pulse frequency or total counts.

Is the AO pin functional?

The AO pin is not used in this module; only the digital output (DO) is active for speed detection applications.

How many sensors are included in the package?

Each package contains ten identical sensor modules, allowing you to implement multi‑axis monitoring or keep spares for future projects.

What support is available for integration?

DAOKAI offers detailed wiring diagrams, example Arduino sketches, and responsive email support to help you get the sensor up and running quickly.