BOM:
1 ATTINY13A-SSU
1 100nF SMD cap 0805
1 schottky diode (MFG# UPS115UE3)
1 4x4x1.5mm tactile SMD tactile push button
1 WS2812 LED on PCB with res+cap
PCBs should be manufactured at 2.0mm thickness instead of standard 1.6mm.
Special thanks to Tim (cpldcpu) for the implementation of the WS2812 protocol.
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