Teyleten Robot IR Infrared Slotted Optical Optocoupler Module Speed Measuring Sensor 3.3V to 5V Photo Interrupter Sensor for Arduino 10pcs

Works great, no issue with any I've used out of the pack so far.

Enhance your Arduino projects with the Teyleten Robot IR Infrared Slotted Optical Optocoupler Module Speed Measuring Sensor. This pack includes 10pcs of sensors designed for precise speed measurement and sensing applications. Operating at voltages between 3.3V to 5V, these photo interrupter sensors are ideal for Arduino projects requiring accurate detection of rotational speed or object presence. They utilize infrared technology for reliable performance in various lighting conditions. These sensors are compatible with Arduino and other microcontroller platforms, offering versatility for robotics, automation, and DIY electronics projects. They are straightforward to integrate and provide real-time feedback through interrupts or digital signals. For enthusiasts and developers looking to implement speed sensing or object detection in their projects, the Teyleten Robot IR Infrared Slotted Optical Optocoupler Module Speed Measuring Sensor pack is an essential choice. It provides reliable performance and ease of use for enhancing sensor-based applications effectively.

These are photo-interruptor modules with attached circuitry to produce a robust binary output. It also includes a convenient LED for debugging. It can operate on either a 3.3 or a 5V supply. I have not tested them all, but at least the first 2 I used were fine.

This sensor works great, provided you only power it with 3.3v. Powering it with 5v will instantly fry it.

Used for robot car. Worked very well combined with some 3d printed slotted wheels and could track travel distance very well

The price for these is oustanding. You could not work up the resistors and other parts needed to make this work unless you could somehow put SMD parts on a tiny, little board. Even then, it would cost a bunch of moola. These are fantastic at this price point.

Great photo sensors. Worked first time as expected.

Used these to make a cheap PID spindle speed controller (poor man’s VFD). Works well.

Just be aware that this doesn’t use any kind of coded pulses to eliminate false positives. It’s just a simple IR LED and photodiode with active low on beam break. Minus one star because ambient light can trigger it as I was hoping the photodiode was only an IR one. Use this for tinkering, but do not use it for an optical endstop on a 3d printer.