Pololu QTR-8RC Reflectance Sensor Array – 8-Channel Digital Output

The Pololu QTR-8RC Reflectance Sensor Array is an infrared sensing module designed for line detection, edge sensing, and short-range proximity measurement in robotics and automation systems. It integrates eight IR LED and phototransistor pairs that provide independent digital outputs compatible with standard microcontroller I/O. Operating from 3.3–5 V, the array offers reliable reflectance detection with optimal performance at around 3 mm distance. Its compact breakable PCB design allows flexible placement and easy integration into line-following robots and embedded control systems.

• 8 infrared LED and phototransistor sensing channels
  
• Independent digital outputs for each sensor channel
  
• Compatible with standard microcontroller digital inputs
  
• Operating voltage range 3.3–5 V
  
• MOSFET control for switching LED emitters on or off
  
• Series LED configuration reduces power consumption
  
• Breakable PCB design for flexible sensor spacing
  
• Compact form factor suitable for robotics platforms

• Operating Voltage: 3.3–5 V
  
• Total Current Consumption: ~100 mA
• Output Type: Digital I/O Compatible
• Number of Sensor Channels: 8
  
• LED Current: 20–25 mA per LED pair
  
• Optimal Sensing Distance: 3 mm
  
• Maximum Recommended Distance: 6 mm
  
• Sensor Type: Infrared LED with Phototransistor
  
• Board Dimensions: 75 × 12.7 × 3.2 mm
  
• Weight: 3.09 g (without header pins)
  
• PCB Design: Breakable into smaller modules
  
• Power Control: MOSFET switch for LED enable
  

• QTR-8A and QTR-8RC Reflectance Sensor Array User’s Guide by pololu.com
  
• 3D model from grabcad.com

• Building Line Following and Line Maze Courses at pololu.com