Unbranded QTR-3A Reflectance Sensor Array

This compact module packs three IR LED/phototransistor pairs onto a 1.25″ × 0.3″ board. The sensors are mounted on a 0.375″ pitch, making this array a great minimal sensing solution for a line-following robot. Each sensor provides a separate analog voltage output. Note: The QTR-3A reflectance sensor array requires analog inputs to take readings. The similar QTR-3RC reflectance sensor array is available with digital I/O-compatible outputs. The QTR-3A reflectance sensor array is intended as a line sensor, ...