the sensor active infrared reflection detection, target reflectivity and shape of the detection distance of the key. The black minimum detection range, white maximum; small area object distance is small, a large area from the large.
The sensor module output port OUT can be directly connected with the microcontroller IO port can also be driven directly to a 5V relay; Connection: VCC-VCC; GND-GND; OUT-IO
The comparator using LM393, stable;
3-5V DC power supply module can be used. When the power is turned on, the power LED is lit;
With screw holes of 3mm, easy to install and mount where ever you need
Board size: 3.1CM * 1.5CM
each module is shipped already comparing the threshold voltage adjustable via potentiometer good, non-exceptional circumstances , do not arbitrarily adjust the potentiometer