QTR-8RC IR Line Sensor Array

The QTR-8RC IR Line Sensor Array is a reflective infrared sensor module designed primarily for line-following and surface detection applications in robotics. It consists of eight IR LED and phototransistor pairs arranged in a linear configuration, enabling precise detection of contrast differences such as black lines on white surfaces. The module outputs digital signals by measuring the discharge time of an RC circuit, allowing microcontrollers to interpret reflectance without requiring an ADC. Its compact and modular design makes it suitable for integration into embedded systems and autonomous robots.

Technical Specifications:

• Operating Voltage: 3.3V – 5V DC
  
• Sensor Type: Infrared LED and phototransistor (reflective)
  
• Number of Channels: 8
  
• Output Type: Digital I/O compatible (RC timing output)
  
• Current Consumption: ~100 mA
  
• LED Current: 20–25 mA (per pair)
  
• Optimal Sensing Distance: ~3 mm
  
• Maximum Sensing Distance: Up to 9.5 mm

Features:

• Eight-channel IR sensor array for accurate line detection
  
• Digital output using RC timing (no ADC required)
  
• High sensitivity to surface reflectivity differences
  
• Independent outputs for each sensor channel
  
• Low power design with LED control via MOSFET
  
• Compact and breakable PCB for flexible configurations
  
• Compatible with microcontrollers like Arduino and AVR
  
• Fast response suitable for real-time applications

Applications:

• Line-following robots and autonomous vehicles
  
• Path detection and navigation systems
  
• Edge detection in robotic platforms
  
• Industrial automation and conveyor tracking
  
• Object detection and proximity sensing
  
• Educational robotics and DIY electronics projects