Using photosensitive resistance sensor.
The comparator output signal is clean, good waveform , driving ability , more than 15mA.
Adjust the sensitivity of digital distribution.
The working voltage 3.3V-5V.
The output format : digital switching outputs ( 0 and 1 ).
A fixed bolt holes for easy installation.
A small PCB board size : 3.2cm x 1.7cm.
Using a wide voltage LM393 comparator.