This project uses the on-board microphone of the Circuit Playground Express's to trigger a pair of servo actuated costume ears to perk up when there is a loud noise. The ears are mounted on a hair band and the whole thing is completely self-contained.
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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