You can build a machine that draws wonderful geometric curve patterns using Crickit, Circuit Playground Express, TT motors, and LEGO. This type of harmonograph drives the pen armature from two motorized hubs running at different speeds, generating and mapping complex harmonic motion!

1 x Adafruit CRICKIT
for Circuit Playground Express
1 x Circuit Playground Express
Round, Awesome Microcontroller Board
2 x TT Motor DC Gearbox
200 RPM 3 to 6VDC


In addition to the parts listed above, you'll also need the following:

  • LEGO bricks and Technic pieces, as listed in the Bill of Materials on the Build the Drawing Machine page
  • Glue, such as hot glue or super glue (CA)
  • Fine point roller ball pens
  • Paper
  • Optional 3D printed Crickit to LEGO plate

This guide was first published on Aug 03, 2018. It was last updated on Mar 08, 2024.

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

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