QTR-HD
The Pololu QTR-HD-02A Reflectance Sensor Array is a customizable reflective optical sensor that provides automated, accurate, and repeatable line-following or edge-detection applications. The sensor array is composed of 8 sensors spaced 0.36” apart from each other and features 2.11 inches of total coverage. This sensor is able to detect the relative reflectance of its target surface from up to 2.25 inches away. The pulse width modulation (PWM) output can be connected directly to an analog-to-digital converter or I/O port for easy integration to any microcontroller or development board. The QTR-HD-02A reflectance sensor array is easy to use and modular, allowing it to fit all kinds of robotics applications, including those that require an extra-long line width.