Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	3.3V - 5V DC
Output Signal	Digital TTL Level
Sensor Type	Slot-Type Optocoupler
Slot Width	5mm
Response Time	< 10 microseconds
Max Current	20mA per channel
PCB Dimensions	32mm x 14mm x 4mm
Mounting Hole Diameter	3mm
Interface	3-Pin Header (VCC, GND, OUT)
Application	Motor Speed Measurement & Pulse Counting

6 reviews

Anonymous

Mar 22, 2026

Rating: 4/5

Solid component for workshops

We use these in our beginner electronics workshops. They are durable enough to handle student handling. The only minor issue is that the LED indicator is quite bright in dark rooms.

Anonymous

Mar 20, 2026

Rating: 5/5

Essential for control systems class

Bought two of these for a university project on feedback control loops. They are robust and provide the digital output needed for our PID controller implementation. No issues so far.

Anonymous

Mar 14, 2026

Rating: 5/5

Exactly as described

The module matches the description perfectly. It handles 5V logic levels easily and the PCB quality looks good with clear silkscreen markings. Will buy again for future prototypes.

Anonymous

Mar 09, 2026

Rating: 5/5

Perfect for Arduino RPM projects

This module works flawlessly with my Arduino Uno. The signal is clean and stable, making it very easy to calculate motor speed accurately. The slot size is perfect for standard encoder disks.

Anonymous

Mar 08, 2026

Rating: 4/5

Good value, needs careful alignment

Great sensor for the price. You need to be precise when aligning the interrupter disk within the slot, otherwise, you might get skipped pulses. Once aligned, it performs consistently.

Anonymous

Mar 08, 2026

Rating: 5/5

Reliable and fast shipping

Used this to build a tachometer for a small DC motor. The response time is incredibly fast, handling high RPMs without any lag. Highly recommended for hobbyist electronics.

5 FAQ

Q: Can this sensor work directly with a Raspberry Pi GPIO?

A: Yes, since the output is 3.3V-5V TTL compatible, it can connect directly to Raspberry Pi GPIO pins. Just ensure you share a common ground between the module and the Pi.

Q: What is the maximum RPM this module can accurately measure?

A: Given the microsecond response time, it can theoretically handle hundreds of thousands of pulses per minute. Practical limits usually depend on your microcontroller's interrupt handling speed rather than the sensor itself.

Q: Is the output active high or active low?

A: When the slot is unobstructed, the output is typically High. When an object blocks the slot, the output goes Low. However, this can depend on specific internal circuitry, so we recommend testing with a multimeter upon arrival.

Q: Can I use this outdoors in direct sunlight?

A: Direct sunlight may interfere with the infrared beam and cause false readings. We recommend shielding the sensor from direct ambient light if used in outdoor applications.

Q: Does this come with an interrupter disk or do I need to make one?

A: The package includes only the sensor module. You will need to create or purchase a separate slotted disk or flag to attach to your motor shaft to interrupt the light beam.

Explore your interests

STC32G12K128 STC8H8K64U Microcontroller Small System Core Board Development Board Emulator

$16.50

Youxin Electronics_STM32H743IIT6 Core Board System Board Learning Board STM32 Development Board

$118.00

Arduino DUE Development Board 32-bit ARM Controller A000062 Italian Official Original Import with Cable

$299.00

Ultrasonic Sensor HC-SR04 Ultrasonic Distance Measuring Module Bracket US015-025-026-100

$3.16

Serial SHT20 Chip Temperature and Humidity Sensor Test, SHT30 Chip Measurement and Monitoring Module by Viter Intelligence

$11.00

High-Speed Yabo Smart Raspberry Pi 4B Motherboard Development Board Accessories RaspberryPi 2G/4G/8G RAM Py

$494.30

Magnetic Circular Counting Chips, Two-Sided Flip Coins for Elementary Math, Kindergarten Early Education, Ten-Frame Matrix, Addition/Subtraction within 10 & 20, Teaching Tools

$11.90

3-Wire/4-Wire Flame Sensor Module, Fire Source Detection with IR Receiver, Flame Detection and Alarm

$1.08

SANSI White Label Class A Glass Graduated Cylinder C18 Micro-Precision Demulsification Cylinder with Scale Measurement Includes Certificate Ground Joint Stopper Hexagonal Bottom Borosilicate Glass Lab Equipment

$3.68

EV2400 Battery Unlock Fuel Gauge Programmer MSP430 HPA500 Evaluation Module Interface Board SMBus

$323.00

Cube Three-View Teaching Aid with Grid - 3D Geometry Observation Tool for Grades 4-5 Math (2cm Cubic Blocks Set)

$15.10

OrangePi Orange Pi Zero3 Zero 3 Development Board Allwinner H618 Orange Pi

$228.00

Digital 38KHz Infrared Receiver Transmitter Head Sensor Module Electronic Building Blocks Robot Infrared Communication Remote Control

$2.29

12V Stable Version Light-Control Switch No-Light Sensing with Extension Cable Photoresistor Plus Relay Module

$49.20

STM32 Smart Car 51 Microcontroller Arduino Obstacle Avoidance Chassis Kit Mecanum Wheel Robot Car

$40.80

Tech Small Production Small Invention DIY Piano Electronic Keyboard Real Playable Science Small Handmade DIY Materials

$33.00

HX711 Pressure Sensor Module Electronic Scale Bracket Weighing DIY Scale Pan Tray Set 5/10/40kg200

$3.28

Transparent 3D Geometric Model Perspective Decomposition Graphic Teaching Aid, Complete Set for Elementary Grades 1-6 Math

$6.80

DHT22 Single-Bus Digital Temperature & Humidity Sensor AM2302 Module Electronic Building Blocks

$10.42

E18-D80NK Infrared Photoelectric Switch Diffuse Reflection Obstacle Avoidance Sensor Module 3-80CM

$12.60

LAN8720 Module Network Module Ethernet Transceiver RMII Interface Development Board Xinwei Electronics

$7.85

STC15W408AS Core Board Minimum System Board 51 Microcontroller Development Board TTSOP20 Learning Board

$18.47

New Version MEGA2560 R3 Development Board, Improved MEGA2560 R3 with Sensor Expansion Board

$13.68

Gradient Visual Illusion Kit: Electric Rotating Assembly Toy for Maker DIY, Paintable Handmade Model

$8.72

51/AVR Microcontroller Core Development Board STC89C52RC/51MCU Experiment Board/ATMEGA32 Learning Board

$37.90

[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set

$15.00

GY-30 302 Digital Light Intensity Illuminance Sensor BH1750FVI Module Light Sensor Ball

$7.41

Foldable Clothes Drying Rack Floor Standing Home Balcony Bedroom Hanging Clothes Quilt Drying Artifact Outdoor Cooling Rod Indoor Drying Rack

$47.10

Metal Detector Module Non-Contact Metal Induction Sensor Detection Module Metal Detector

$8.70

RV1103 Miniature Linux Development Board: RISC-V Vision and AI with Ethernet Port

$53.10

For Arduino Development Board R3 Mainboard Microcontroller Module Kit Programming Learning Board Sensor Suite

$78.00

Xuefen Geometry Stamping and Tracing Set for Grades 1-2, 3D and 2D Ink Pads, Math Learning Tools, Cube and Cuboid Models

$4.51

Rubber Tire Toy 4WD Smart Car Wheels Car Model Robot Accessories (Suitable for 2mm Axle)

$0.50

E18-D80NK Infrared Obstacle Avoidance Sensor Proximity Switch Smart Robot Car 10-80cm

$6.30

Digital 38KHz Infrared Receiver/Transmitter Head Sensor Module for Electronic Building Blocks Robots, Infrared Communication Remote Control

$2.80

51 MCU Minimum System STC89C52 DIP40 Through-Hole Smart Car Main Control Board Learning Experiment

$19.80

Outdoor Adventure Kids' Insect Observation Box with Magnifying Glass, Boys & Girls Toy for Exploration, Butterfly Catching and Fish Scooping Tools

$7.80

MPU-9255 9-Axis Attitude 3-Axis Electronic Compass Accelerometer Gyroscope Magnetic Field Sensor Module

$13.42

Freeze-Dried Chicken Treats for Dogs: Nutritious Weight-Gain Breast Meat Chunks for Puppies – Teeth Cleaning, Grain Mixing, Universal Use

$3.90

Soil Moisture Sensor Probe Soil Moisture Meter Detection Module Sensor Separate Probe

$2.39