DESCRIPTION The tcrt5000 sensor works with the general principle of infrared sensors, a sense of transfer. Tcrt5000 has an infrared emission tube and an infrared receiver tube. When the infrared emission tube is reflected in the receiver tube to receive, the resistance of the receiver tube will change, the circuit is generally reflected in the form of voltage changes, and after the conversion of the ADC or circuit form lm324 and another output processed after the results. Changes in resistance in the receiver tube to receive the infrared signal strength, It is often reflected on the reflective surface of the color and the reflector distance of the receiver two aspects. Specification - Model: TCRT-5000 - Sensing Distance: 0.591" (15mm) - Collector Current: 100mA - Forward Current: 60mA - Sensing Method: Reflective - Voltage: Max. 70V - Pin Pitch: 0.55cm - Great for DIY project