Build a bike light with the Circuit Playground. It senses when the bike is braking and lights up NeoPixels when the bike is slowing down.
When the bike is at a full stop, the NeoPixels will fade in and out!
A 3D printed mount allows you to attach the circuit playground case to the frame of your bike.
Guide: https://learn.adafruit.com/circuit-playground-bluefruit-brake-light
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