In this Halloween electronics project, I made a jack-o-lantern. I used a 3D-printed carved pumpkin, but a real one works just as well (or even better!).
Get the full description with code and connection diagram here:
https://www.build-electronic-circuits.com/halloween-project-jack-o-lantern/
The project is based around three normal LEDs that I control so that they look like a flickering flame. Since my “pumpkin” was very small, I used 3mm LEDs. For bigger pumpkins, I recommend using bigger and brighter LEDs.
The LEDs are connected in series with a resistor to the PWM pins on the Arduino so that I can control the brightness. And in the code, I change the brightness of each LED to a random value for every 50 milliseconds.
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