Legends agree that Unicorn horns have magical healing and purification properties.  Unicorns do this naturally -- as soon as their horn encounters scummy pond water or a festering wound, the horn's magic kicks in and does its thing.  How cool is Nature?

For a cosplay Unicorn, it's not quite as intuitive to invoke the horn's magic.  This horn solves that problem with another kind of magic: capacitive touch.

Decorate the horn with a beautiful vein of copper and let the purification process begin with a simple touch.  The horn glows with color shifting rainbows all the time, and when someone touches the copper vein, the rainbow will fade and the horn's tip will glow a bright white, purifying everything in its vicinity.  Like magic!

Parts Needed

1 x Gemma M0
Gemma M0 Microcontroller
1 x Neopixel Ring
12 Neopixel Ring
1 x Battery
LiPoly 350mah Battery
1 x Battery Charger
USB Charger
1 x JST Connector
Battery Charger connector
1 x White LED
Diffused white 3mm LED

Also Needed

  • 1 x 51Ω resistor (or similar)
  • Copper foil tape in your desired width
  • Heat shrink tubing

You will also need a unicorn horn -- you can 3d print one or make your own out of worbla, resin, or any other translucent material.  Marlinspike Auger seashells make great unicorn horns too.  The sky's the limit!

This guide includes a printable unicorn horn file as well as a printable mounting plate, so you can remove the horn for switching it on/off and battery charging.


  • 3d Printer (optional)
  • Soldering iron & accessories
  • Utililty knife
  • Needle & thread for mounting

This guide was first published on Jan 26, 2018. It was last updated on Jan 26, 2018.

This page (Introduction) was last updated on Jan 16, 2018.

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