product description: Meter pulse data sampling Fax machine, shredded paper detection Obstacle detection Black and white line detection   Module function: Use infrared reflection sensor TCRT5000 Test reflection distance: 1mm to 25mm Clean and 3, comparator output, signal waveform, Strong driving ability, more than 15 horses. Equipped with multiple adjustable precision potentiometers to adjust sensitivity Operating voltage is 3.3V to 5V Output form: digital switch output (0 and 1) Fixed bolt holes for easy installation Small board PCB size: 3.2cm x 1.4cm LM393, using a wide voltage comparator Size: 3.1x1.3cm (about)   Module function introduction: The TCRT5000 infrared emission diode sensor continuously emits infrared light. Infrared rays are emitted when the intensity of the reflection is not reflected or is not large enough. The light activated triode is always off. At this point, the output of the module is high. Indicating that the diode is off; The detected object appears within the test range. The infrared rays are reflected back, and the intensity is large enough. Light activated triode saturation, At this point the output of the module is low, indicating the diode light.