The .stl file for a 3D printed Steven Universe Warp Pad base for the crystal is below. Print with supports! 

For the larger crystal, the Circuit Playground Express simply goes inside the crystal. For the smaller one, you can hide the Circuit Playground and battery inside the bottom of the base. Hot glue works great to secure the crystal firmly in place.

Large Crystal

Plug a battery or USB cable into your Circuit Playground Express. I like to add a rubber band to my battery to help it stay hidden.

Slip the board inside the crystal and nestle it along the creased edge, with the battery underneath in the bottom of the crystal or the USB cord threading out and down through the flap you left open. 

Add the crumpled cellophane to diffuse the light.

Small Crystal

This one's a bit more complicated since we need to do some wiring and soldering. The small crystal has just one NeoPixel inside, but the magic here is that you can have a series of crystals all animating together, which is definitely worth a little extra work.

Start by finding the striped wire on the ribbon cable. This wire will be your power (VOUT) wire, the next wire will be data, and the third wire will become your ground wire. We don't need the fourth wire, so pull it apart from the others and save for another project.

Solder the three remaining wires to your Circuit Playground:

  • Striped wire to VOUT
  • Middle wire to A1
  • Third wire to G

Note: Don't use A0 instead of A1 -- A0 is the speaker pin, and does not like to run NeoPixels.

Measure out the length of wire you want. Cut it to length. If you're using just one NeoPixel, solder the striped wire to +, the middle wire to IN, and the third wire to G.


If you're using more than one NeoPixel, you'll want to solder two wires into the + and - pads, so you can pass power to the next pixel on down the line. Solder a wire from OUT on your first pixel to IN on the next pixel in the series, and so on.

Slip each pixel inside the end of your crystal and secure it in place with hot glue. Add your crumpled up cellophane diffuser, then secure the crystal's open flap with krazy glue.

This guide was first published on May 14, 2019. It was last updated on Mar 08, 2024.

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

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