Building Obsidian’s Sword from Steven Universe!

This thing was forged from foam core and has a NeoPixel LED strip making it super bright.

Customize LEDs colors and make sound effects when you swing in battle!

It’s a bit over 3 feet (900mm) long and completely made from foam core poster boards.

We used one 20x30 inch foam core boards to create this awesome sword!

The handle, blade and components are detachable so it's easy to break down and travel with!

We used Microsoft MakeCode to animate the NeoPixel LED strip! Codeblocks makes it fun and easy to learn how to program hardware with the Adafruit Circuit Playground Express.


The NeoPixel LED strip is press fitted into the blade with wires routed through the handle.

Alligator clips makes it easy to connect to the Circuit Playground Express!

We used a inkjet printer and vinyl cutter to make the details out of card stock!

Craft Parts/ Tools

To build this project, all you need are some foam core poster boards and art supplies. 

Prerequisite Guides

There's resources in these guides that go beyond what's covered in this tutorial. The MakeCode guide is all about setting up your Circuit Playground Express board.

The Circuit Playground Express introduction guide walks you through all of the pinouts, sensors and everything you need to know.

Parts List

This is an easy to copy + paste list of parts linked to their individual product pages.

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This guide was first published on Feb 19, 2019. It was last updated on Mar 08, 2024.

This page (Overview) was last updated on Mar 08, 2024.

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