Infrared reflectance arrays use paired IR emitters and phototransistors to detect changes in surface reflectivity. They suit line following, edge detection, surface mapping and short‑range presence sensing where multiple close-spaced channels give spatial resolution.
Variants include single sensors up to long multi‑channel strips, different sensor pitch for finer or coarser resolution, analogue outputs for proportional readings and RC (digital) outputs for simple thresholding, and longer‑range versions for greater standoff. Integrated LEDs provide consistent illumination, low‑profile boards simplify mounting, and standard logic‑level signals make interfacing to microcontrollers straightforward and reliable.
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