This is the source code for the bike LED strips I brought to Burning Man 2016. It is based on the Adafruit Trinket Pro 5V platform and some NeoPixel (WS2812b) LED strips.
https://goo.gl/photos/Frb8jJ4YUS3G5xdX8
Parts used:
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1x Adafruit Trinket Pro 5V.
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1x waterproof enclosure, which provides space for the Trinket and comes with integrated 4.5V output thanks to a double row of 3AA batteries.
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1x on/off switch. Preferrably waterproof.
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1x temporary on switch. Preferrably waterproof.
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Some wire
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60 + 4x 11 pixels (in 2x 22 strips)
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Hot glue, transparent hot shrinking tube.
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Industrial velcro strips (to attach the box to the bike).