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An LED is a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as putting a series resistor or can get more complicated, involving PWM and multiplexing.

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I've made a device that lights an LED at a very low current (<10 microamps) as a very dim indicator for use in the dark. At its simplest, the circuit is a 3V coin battery + resistor (300K-1M ohms … ) + LED. I'd like it to turn off when there's ambient light in the room and, ideally, draw no power whatsoever to save the small battery it runs on. The darkness detectors I'm aware of, however, use …
asked Feb 7 by Ted Raskol