Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	Infrared Slotted Optocoupler (Through-Beam)
Operating Voltage	3.3V - 5V DC
Output Signal	Digital TTL Level
Slot Width	5mm
Response Time	< 10 microseconds
LED Wavelength	940nm Infrared
Mounting Hole Distance	Standard 2.54mm pitch
PCB Dimensions	32mm x 14mm x 4mm
Primary Application	Smart Car Speed Measurement & Motor RPM Testing
Package Includes	1x Sensor Module, 1x Pin Header Strip

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Perfect for my Arduino robot car

This sensor works flawlessly for measuring wheel speed. The response time is incredibly fast, and it integrates easily with standard microcontrollers. Highly recommended for DIY robotics projects.

Anonymous

Mar 23, 2026

Rating: 4/5

Works as described

Simple plug-and-play setup. I added a pull-up resistor just to be safe, though it seemed to work without one initially. Solid component for speed sensing.

Anonymous

Mar 19, 2026

Rating: 5/5

Essential for motor testing

Used this to test RPM on a small DC motor for my university project. The digital output is clean and easy to read with an oscilloscope. No noise issues detected.

Anonymous

Mar 14, 2026

Rating: 4/5

Good value, needs careful alignment

The module functions well once aligned correctly. You need to ensure the encoder disk passes cleanly through the slot without touching the sides. Great price for the performance.

Anonymous

Mar 06, 2026

Rating: 5/5

Great upgrade for RC cars

Replaced my old mechanical sensor with this optical one. The accuracy improvement is noticeable immediately. No more missed counts at high speeds.

Anonymous

Mar 03, 2026

Rating: 5/5

Reliable and durable

We bought ten of these for our workshop. They have held up well under frequent use by students. The infrared beam is strong and consistent.

5 FAQ

Q: Is the output active high or active low?

A: The output is typically active low (0V) when the beam is blocked and active high (VCC) when the beam is clear, but this can depend on specific circuit configuration.

Q: Can this sensor work with a 3.3V microcontroller like ESP32?

A: Yes, the module operates within a 3.3V to 5V range, making it fully compatible with ESP32, Arduino, and Raspberry Pi GPIO pins.

Q: Does the package include the encoder disk wheel?

A: No, this package includes only the photoelectric sensor module and pin headers. You will need to provide or 3D print your own slotted encoder disk.

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

A: Given the microsecond response time, it can accurately measure speeds exceeding 20,000 RPM depending on the number of slots in your encoder disk.

Q: Can I use this outdoors in direct sunlight?

A: Direct sunlight may interfere with the infrared signal. We recommend shielding the sensor or using it in shaded areas for outdoor applications.

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