Description
Reviews
| 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 |
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.
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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