Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | 3.3V - 5V DC |
| Output Signal | Digital Switching (High/Low) |
| Sensor Type | Slot-Type Optocoupler |
| Slot Width | 5mm |
| Response Time | < 10 microseconds |
| LED Indicator | Yes (Power and Signal) |
| Mounting Hole Diameter | 3mm |
| PCB Dimensions | 32mm x 14mm |
| Interface Pins | VCC, GND, OUT |
| Application | Motor Speed Testing, RPM Counting, Object Detection |
Anonymous
Mar 26, 2026
Rating: 4/5
Great for learning embedded systems
Bought this for a university project on motor control. It helped me understand interrupts and pulse counting easily. The documentation could be slightly better, but there are plenty of online tutorials.
Anonymous
Mar 16, 2026
Rating: 5/5
Robust build quality
Feels sturdy and well-soldered. I've been running it continuously for a week on a test bench without any dropouts or false triggers. Definitely buying more for my next batch of robots.
Anonymous
Mar 11, 2026
Rating: 5/5
Excellent precision
I tested this against a commercial tachometer and the readings were within 1% accuracy. The slot width is perfect for standard interrupter wheels. Fast shipping too.
Anonymous
Mar 09, 2026
Rating: 5/5
Perfect for Arduino motor projects
This module worked flawlessly with my Arduino Uno. The signal is clean and the response time is fast enough for accurate RPM counting on small DC motors. Highly recommended for hobbyists.
Anonymous
Mar 03, 2026
Rating: 5/5
Reliable and easy to use
Plug and play simplicity. The LED indicators make debugging very easy; you can instantly see if the beam is broken. Used it to build a tachometer for my 3D printer fan upgrade.
Anonymous
Mar 02, 2026
Rating: 4/5
Good value, needs stable mounting
The sensor itself is very sensitive and accurate. I deducted one star because the mounting holes are a bit tight, so you need to be careful not to crack the PCB when screwing it down. Otherwise, great product.
Q: What is the maximum speed (RPM) this sensor can accurately measure?
A: Given the response time of less than 10 microseconds, this sensor can theoretically handle hundreds of thousands of pulses per second. For most hobby motors up to 20,000 RPM with a standard interrupter wheel, it will be perfectly accurate.
Q: Is the output signal pull-up or pull-down?
A: The module typically outputs a LOW signal when the slot is blocked and HIGH when clear (or vice versa depending on specific logic design), but it includes an onboard comparator for a clean digital TTL signal suitable for microcontrollers.
Q: Can I use this outdoors?
A: While the component works well, the open-slot design means strong direct sunlight might interfere with the infrared beam. We recommend shielding the sensor from direct ambient light if used outdoors.
Q: Can this module work directly with a Raspberry Pi GPIO?
A: Yes, it works with Raspberry Pi. Since the module operates at 3.3V-5V, you can connect VCC to the 3.3V or 5V pin and the OUT pin directly to a GPIO pin configured as an input.
Q: Does the package include an interrupter wheel?
A: No, this package includes only the sensor module. You will need to provide your own interrupter wheel or a slotted disk to attach to your motor shaft.
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