Set consisting of two TCRT5000 reflection sensors and a small management board based on the LM393 chip. When a light-colored object approaches, the signal intensity received by infrared reflective sensor increases and the indicator LED on board turns red. When a dark-colored object approaches, the intensity decreases and the LED turns off. 
This sensor is a basic and widely used part in applications such as line-following cars, rotary speed detection, auto data logging on utility meters or other situations where color or distance contrast is sharp.

• Operating voltage: 3,3 to 5 VDC
• Range: 1 to 15 mm (adjustable by trimmer)
• Output signal: digital output (0 &1)
• Dimensions (mm):
  - main board: 32x17x8
  - sensors: 16x14x12
• Weight: 12 grams

• TCRT5000
• LM393