Description
Reviews
| 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 |
| LED Indicator | Yes, Power and Signal |
| Mounting Hole | 3mm Diameter |
| PCB Dimensions | 45mm x 20mm |
| Compatibility | Arduino, Raspberry Pi, STM32 |
Anonymous
Mar 24, 2026
Rating: 5/5
Reliable and fast shipping
Used this to monitor a conveyor belt speed. The optocoupler isolation is a nice feature for protecting the microcontroller. Highly recommended.
Anonymous
Mar 23, 2026
Rating: 4/5
Good value, clear instructions needed
The sensor itself is high quality and responsive. I deducted one star because the pinout wasn't clearly marked on the board, but I figured it out with a multimeter.
Anonymous
Mar 17, 2026
Rating: 4/5
Solid component
We use these in our workshop for various motor testing rigs. They are durable and handle continuous operation well. Just ensure you have a pull-up resistor if your MCU doesn't have internal ones enabled.
Anonymous
Mar 12, 2026
Rating: 5/5
Great for university projects
Bought this for my final year control systems project. It detects the interrupter disk perfectly without any debouncing issues in software.
Anonymous
Mar 09, 2026
Rating: 5/5
Perfect for RPM projects
This module worked flawlessly with my Arduino Uno. The signal is clean and stable even at high motor speeds. Great for building a tachometer.
Anonymous
Mar 01, 2026
Rating: 5/5
Exactly as described
Compact size fits easily into tight enclosures. The LED indicators make debugging very easy. Will buy again for future builds.
Q: Does this module come with the interrupter disk or just the sensor?
A: This listing includes only the sensor module. The interrupter disk (slotted wheel) needs to be attached to your motor shaft separately.
Q: What is the maximum RPM this sensor can accurately measure?
A: Given the fast response time, it can theoretically handle tens of thousands of RPM depending on the number of slots in your interrupter disk. For a standard 10-slot disk, it works well up to 20,000+ RPM.
Q: Can I use this directly with a 3.3V ESP32?
A: Yes, the module operates within the 3.3V to 5V range, so it is fully compatible with 3.3V logic boards like the ESP32 without needing a level shifter.
Q: Do I need to solder headers to this board?
A: The module typically comes with pins unsoldered to allow for flexible mounting, but some batches may include pre-soldered headers. Please check the specific product images or description variations.
Q: Is the output normally high or normally low?
A: The output is normally High when the slot is open (no obstruction) and goes Low when the slot is blocked by an object.
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