Check out the latest tutorial from Erin St Blaine: make a pair of glowing LED devil horns that react to your movements.
These lightweight paper-mâché horns are packed with NeoPixels and powered by an Adafruit RP2040 Prop-Maker Feather. The onboard accelerometer senses head movement and triggers different animations — tilt your head for a slow molten glow, or give it a shake to send a bright flare racing from the base of the horns to the tips.
Perfect for Halloween, cosplay, festivals, performances, or anytime you need a little extra fire and brimstone.
From the guide:
Bring out your naughty side with these DIY devil horns. The horns are made from paper mache and filled with high-density LED lights that flicker and glow like burning embers.
The lights are controlled by a PropMaker Feather RP2040. This board has got an onboard accelerometer that can read your head gestures and trigger different animations based on your movements. There is CircuitPython sample code that animates the horns with a slow lava-flow animation when you tilt your head, and a flare-up spark animation when you give your head a shake.
This is an intermediate level project that requires a little careful soldering and a lot of hot glue.
Build yours with:
Adafruit RP2040 Prop-Maker Feather with I2S Audio Amplifier
Ultra Skinny NeoPixel 1515 LED Strip – 4mm wide
Snap-on Enclosure for Adafruit FeatherWing RP2040 Prop-Maker
Check out the full tutorial on the Adafruit Learning System:
https://learn.adafruit.com/motion-reactive-led-devil-horns/overview