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It's powered by USB battery bank and a USB-PD breakout module that tells the battery bank to output 12V. I put them inside a zip-lock bag inside the 3D printed box. It's water proof enough for the sonoran desert.
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this post was submitted on 21 Aug 2026
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Nicely done! I do something like this on my bike too, except it's just strips of neopixel RGB LEDs on the frame held in place with zip ties driven by a pi pico. As a result I can program different light modes (flash, solid, fade, rainbow party mode, fake police lights etc etc etc) and even turn signals.
Having a single battery means less to charge/replace. It all runs off a USB battery bank and lasts days. My lights also cannot be removed or stolen easily and even if you do what's the point it's just a strip of LEDs, it's all easily replaced even if they do. Having integrated bike lights seems more convenient for me and I don't have to worry about forgetting my lights when I go out after dark.