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While troubleshooting an optical positioning system, an engineer learns the importance of seeing. Several years ago I was doing the system and circuit design of agroupof R/W optical disk drives used ...

Did you know that the LED can be used as a light detector? In fact green LEDs are the best for this, but all LEDs will detect light and produce a voltage equal to the characteristic voltage-drop. The ...

Each LED sensor exhibits different dynamic range, linearity, and sensitivity, which can be changed by altering the LED/detector angle. The sensors can readily measure dye concentrations several times ...

This is a story about a successful system that nevertheless failed to make the cut. An experimental LED brightness adjustment is something [Mitxela] explored in a project for a high-precision clock; ...