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Sensor has 3 pins ; vcc , out , gnd. vcc and gnd power supply end , out is signal .
Detection distance: about 2 cm . optic color different somewhat different distance , white .
Power supply voltage : 2.5v – 12v
Current , 5v when 18 ~ 20ma .
Black reflects small quantity of light compared to white, the sensor will detect the presence of white line and send a signal