Candle technology has not changed much in thousands of years – you add fire to a wax-soaked wick, and it provides light for hours. It's simple, it's effective, and it does not need an upgrade. To be fair to Keith from Keith's Test Garage, he did not spend every obsessively engineering and perfecting his candle. It was a low-priority side project that he would occasionally dive back into when he needed a fun distraction.
Powered by an Arduino These mini-LEDs are self-contained LEDs that are heavily randomized so they can be easily adjusted. The overall effect is that of actual flame bouncing around.
That's the easier part, however, as there's no shortage of believable LED-based candles on the market right now. In the light of the candle, the LEDs are lit. But the best feature is a glycerin-soaked fiberglass wick that produces a quick puff of smoke when zapped with a few volts.
It's overkill, yes, and overkill for the. It's triggered by a microphone that does not turn off, but the candle also produces a satisfying trail of whiskey that drifts away sake of just seeing if it was at all possible. But if you want to add a little atmosphere to your home, without the risk of burning it to the ground, this is essentially the vape of candles, letting you safely get your mood-enhancing fix.
[Keith’s Test Garage via Hackaday]