Here is a cool project from Adafruit that shows you what it takes to build a pair of ears that react to your head movements. To complete these Circuit Playground Express Head-Tilt Ears, you are going to need 2 servos and a LiPo battery in addition to a Circuit Playground Express. You will also need a headband, felt or faux fur to cover the ears, flexible wires, and a few other things.
More gadgets like this: here
Pretty fun project to try for Cosplay or other geek events.
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