The QTR-8 array sensor is designed for accurate line detection in robotics. It uses eight infrared emitter-receiver pairs to sense surface contrast and track lines with high precision. The sensor works well with Arduino, Raspberry Pi and other microcontrollers. It performs reliably on different surfaces and is widely used in line-following robots, maze solvers and automation projects. Its compact layout, fast response and stable readings make it a good fit for both beginners and advanced makers.

Specifications:-

• Model: QTR-8A or QTR-8RC (depending on version)

• Number of sensors: 8 IR emitter-receiver pairs

• Operating voltage: 3.3V to 5V

• Output type:

  • Analog (QTR-8A)

  • RC-based digital timing output (QTR-8RC)

• Optimal sensing distance: 3 mm

• Usable sensing range: 1–6 mm

• Emitter current: Approx. 30 mA when active

• Board size: About 75 mm × 15 mm

• Applications: Line-following robots, surface contrast detection, edge detection, maze robots, automation

• Compatibility: Arduino, ESP32, Raspberry Pi, STM32 and other controllers