IR Line Following Reflectance Sensor Array (QTR-8RC)

  • Eight IR Sensors: Provides accurate reflectance measurements
  • Digital Outputs: Simplifies interfacing with microcontrollers
  • Adjustable Sensitivity: Fine-tuning via potentiometers
  • Compact Design: Slim and lightweight for easy integration
  • High-Speed Operation: Suitable for fast-moving robots
  • Versatile Mounting Options: Multiple mounting holes for flexibility
  • Wide Voltage Range: Operates at 3.3V to 5V for compatibility



The IR Line Following Reflectance Sensor Array (QTR-8RC) is a versatile and efficient sensor array designed for line-following robots and edge detection applications. Featuring an array of eight infrared reflectance sensors, the QTR-8RC offers precise and reliable detection of line markings and contrasting surfaces, making it ideal for a wide range of robotics and automation projects.

Key Features

  1. Eight IR Sensors:
    • Comprises eight IR emitter and phototransistor pairs, providing accurate reflectance measurements across a broad surface area.
  2. Digital Outputs:
    • Each sensor provides a digital output, simplifying the process of interfacing with microcontrollers and other digital systems.
  3. Adjustable Sensitivity:
    • Sensitivity can be adjusted via potentiometers, allowing for fine-tuning based on the specific application and surface characteristics.
  4. Compact and Lightweight Design:
    • The slim form factor (76.2mm x 12.7mm) ensures easy integration into various robotic platforms without adding significant weight or bulk.
  5. High-Speed Operation:
    • Capable of high-speed reflectance measurements, making it suitable for fast-moving line-following robots and dynamic environments.
  6. Versatile Mounting Options:
    • Multiple mounting holes and options provide flexibility in sensor placement and orientation.
  7. Wide Voltage Range:
    • Operates within a voltage range of 3.3V to 5V, ensuring compatibility with a variety of microcontrollers and power systems.


  • Line-Following Robots:
    • Essential for building robots that follow lines on the floor, such as maze solvers, delivery robots, and educational robotics kits.
  • Edge Detection:
    • Useful in applications where detecting the edge of a surface or object is crucial, such as in automated sorting systems and boundary detection.
  • Path Tracking:
    • Ideal for automated guided vehicles (AGVs) and other autonomous systems that require precise path tracking and navigation.


  • Sensor Type: IR reflectance sensor
  • Number of Sensors: 8
  • Output Type: Digital
  • Voltage Range: 3.3V to 5V
  • Dimensions: 76.2mm x 12.7mm
  • Weight: 6 grams
  • Mounting Holes: Multiple for flexible installation
  • Adjustment: Sensitivity adjustment via potentiometers


  • Precision: Provides accurate and reliable line detection for enhanced performance in line-following applications.
  • Ease of Use: Digital outputs simplify integration with microcontrollers, reducing the complexity of sensor interfacing.
  • Flexibility: Adjustable sensitivity and versatile mounting options allow for customization to suit various project requirements.
  • Efficiency: High-speed operation ensures timely and precise measurements, supporting the needs of fast-moving robots.
  • Compatibility: Wide voltage range and compact design ensure compatibility with numerous platforms and minimal impact on overall system design.

The IR Line Following Reflectance Sensor Array (QTR-8RC) is an indispensable component for robotics enthusiasts and professionals looking to build efficient and reliable line-following robots and automated systems. Its precision, versatility, and ease of integration make it a standout choice for enhancing your robotics projects.

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