Using imported groove optical coupling sensor, width 5mm.
It have the output state light, if output is high level, the lights are off. If output low level, its on.
If it covered, it will output high level; otherwise it output low level.
Good signal and waveform, with strong driving ability for more than 15mA.
Working voltage of 3.3V to 5V.
Output: digital switch output (0 and 1).
Equipped with a fixed bolt hole, easily install.
Small board PCB size: 3.2 cm x 1.4 cm approx.
Use the LM393 wide voltage comparator.