High Density (HD) QTR Arrays

High‑density reflectance arrays use infrared LED and phototransistor pairs to detect subtle changes in surface reflectance, making them suitable for line following, edge and gap detection, surface mapping and close‑range object sensing. They come as tightly spaced multi‑element strips or single sensors with extended range or low‑current variants.

Key attributes include closely spaced channels for fine lateral resolution, analogue outputs for graduated readings and digital RC outputs for thresholded signals, and options that trade luminous drive for lower power consumption. Standard board footprints and simple drive requirements make integration straightforward, while solid‑state sensors offer repeatable, reliable performance in short‑range sensing tasks.