Searching for a simple costume project to bring your Unikitty or Lady Rainicorn to the next level? 3D print a flexible unicorn horn and illuminate it from within with NeoPixels and a GEMMA M0, GEMMA v1 or GEMMA v2 based microcontroller. Or forget the electronics and use glow in the dark NinjaFlex filament for a green glow with no batteries required.

This guide was written for the Gemma v2 board, but can be done with either the original or Gemma M0. We recommend the Gemma M0 as it is easier to use and is more compatible with modern computers!

This is a pretty quick soldering project that is suitable for attentive beginners! Prerequisite guides:

For this project you will need:

Unicorn glamour shots by Andrew Tingle.

This guide was first published on Aug 05, 2015. It was last updated on Jul 16, 2024.

This page (Overview) was last updated on Aug 04, 2015.

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