This project is a reuse of the project built in the Circuit Playground Express Perk-up Ears guide. It's a good example of how you can find new and interesting ways to reuse or extend an cool bit of hardware.

So if you built the perk-up ears headband from that guide, charge up the battery, and plug in the USB cable. Otherwise, work thought that guide to build the servo-ears headband.


This project uses a Circuit Playground Express, 2 servos, and a LiPo battery. Any size battery can be used, but the 1200 mAh model is a good balance between size and lifespan.

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  • Headband
  • Construction paper
  • Corrugated cardboard
  • Hot glue and glue gun
  • 2 rubber bands of an appropriate size
  • Felt, faux fur, or fabric as desired to cover the ears
  • Jumper wire with male pins if you want to solder to the CPX for a more robust connection
  • flexible/stranded wire to use as an actuator
  • 4 pieces of stiff wire (long male header pins work well) and wire to mechanically connect the servo 

This guide was first published on Sep 18, 2018. It was last updated on Apr 15, 2024.

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

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