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Flameless Candle for One-12 months-Outdated’s Birthday – Hackster Weblog

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Michael Teeuw’s son Luca not too long ago turned one, and whereas birthday truffles historically have a small flame on prime of them within the type of a candle, Teeuw (logically) determined {that a} one-year-old was to not be trusted with fireplace. As a substitute, he did what any accountable hacker-dad would do and created a fake candle on a PCB to behave because the “flame.”

This candle makes use of a MEMS microphone and amplifier to detect sound, and thus blowing, and an ATtiny85 to simulate a blinking flame. Amplified sound alerts are fed into the microcontroller’s ADC, which controls three LEDs through PWM. Whereas the ATtiny85 usually solely permits PWM output on two pins, this was potential per a method outlined right here.

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The candle PCB was designed in KiCad 5.1 within the 40mm form of a regular tea gentle, and features a CR2032 battery holder in addition to the microphone on the bottom. Whereas the construct was successful, it needs to be identified that the microphone used right here is dwarfed by a 2 Euro coin. Teeuw admits he was a bit intimidated, however was in a position to correctly solder it into place.

One remaining little bit of trickery concerned constructing an precise flame form with sizzling glue to raised simulate the a candle. The construct was successful, as Luca reportedly had a terrific birthday, with no hazard of fireplace concerned!

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