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I made these plastic milk bottle lights by embedding LEDs in the caps, hanging them from a bent section of pipe and hooking them up to an Arduino microcontroller.
Not happy with an on-off switch, I thought they might look mesmerising with a rotary control knob turning them on in sequence. It works! They make great low lighting to wind down for sleep, and they’re great to hang in the hall for parties too.
There are complete build instructions on Instructables.
From the Upcoming 
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