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ATmega328P-AUR or ATmega88PB-AUR programmed for the RGB Stackable LED Star [1620920A.HEX or 1620920B.HEX]
An ATmega328P 8-bit SMD microcontroller programmed with the firmware to produce LED patterns for the RGB LED Star (1620920A.HEX).
Note that since ATmega328Ps are very hard to get, you might receive an ATmega88PB instead. It is programmed with a slightly different HEX file (1620920B.HEX) that does the same job on this processor.
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