QTR-8RC High-Density 8-Channel Reflectance IR Sensor Array – Professional Digital Line Follower and Edge Detection Module for High-Speed Robotics and Competitions

Product Description

The QTR-8RC Reflectance Sensor Array is a high-precision line-sensing solution designed for high-performance robotics. Unlike standard analog sensors, the RC version uses a capacitor discharge circuit, allowing each of the 8 sensors to be read by a single digital I/O pin on your microcontroller. This module is the industry standard for line-following robots, grid navigators, and maze solvers. Its high-density layout ensures that even thin lines are detected with extreme accuracy, providing the reliable feedback necessary for smooth PID control at high speeds.

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Detailed Key Features

• Advanced RC Timing Logic: Each sensor output is measured by the time it takes for a capacitor to discharge, allowing for precise reflectance readings using only digital pins—no ADC required.

• Separable Design: The module is engineered with a breakaway point, allowing you to cut off the last two sensors to create a 6-sensor array and a separate 2-sensor module for tighter chassis designs.

• Integrated LED Control: Features a dedicated "LEDON" pin that allows the microcontroller to turn off the IR emitters to save power or to measure ambient light interference.

• High-Density Sensor Pitch: Sensors are spaced at exactly 9.525mm (0.375"), providing a wide sensing field that can track lines effectively even during sharp turns.

• Robust Noise Filtering: The digital discharge method is inherently more resistant to electrical noise than standard analog voltage dividers.

All Technical Details

• Emitter Current: ~20-25mA per LED pair.

• Logic Level: Compatible with 3.3V and 5V systems (Arduino, ESP32, STM32).

• Dimensions: 74.9mm x 12.7mm x 3.2mm.

• Weight: Lightweight (~3.5g) for minimal impact on robot agility.

• Filtering: Onboard resistors and capacitors tuned for standard robotics track surfaces.