The TCRT5000 infrared sensor KY-033 continuously emits infrared emitting diodes when there is no emitted or reflected infrared reflected back, but the intensity is not strong enough, the phototransistor is already in the off state, and the output terminal of the module is high, indicating that the diode has been in the off state; it must be detected within the detection range In the object, the intensity of the reflected infrared is large enough, the phototransistor is saturated, the output of the module is low, and the indicator light is on.

The left side of the module is the infrared transmitting and receiving device, and the middle right position of the module is an adjustable resistor for adjusting the measuring distance. It has a total of three pins, from top to bottom:
? VCC: Connect to the positive pole of the power supply
? OUT: signal output pin, output 1 indicates that the color of the measurement surface is darker, and output 0 indicates that the color of the measurement surface is lighter
? GND: Connect to the negative pole of the power supply

? Instrument pulse data sampling
? Fax paper shredder detection
? Obstacle detection
? Black and white line detection

? Use infrared reflective sensor TCRT5000
? Detection distance: 1mm~8mm, focal length is 2.5mm
? The output signal of the comparator is clean, the waveform is good, and the driving capacity is greater than 15mA
? Adopt multi-turn precision potentiometer to adjust sensitivity adjustment
? Working voltage: 3.3V-5V
? Output format: digital switch output (0 and 1)
? Fix bolt holes for easy installation
? A small PCB board size: 3.2cm x 1.4cm
? Use wide voltage LM393 comparator