Candle - 2013
Very simple LED candle which shines only in the dark. It is powered by 2 AA batteries and the flickering effect is made by an Attiny13 microcontroller with a pseudorandom number generator inside. It turns on only when the voltage on infrared diode drops below a certain threshold, hence, glows only in the dark.
Schematics and firmware for Attiny13 are available here.
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