I essentially built my own Arduino Uno. It has an AtMega8U2 which I was easily able to load the USB to serial firmware onto and it works great. The main processor is an AtMega328 (not the 328p). The difference between the 328 and 328p I believe is only the power usage and the device ID on the chip. …

Loading Optiboot onto stock AtMega328

nickgammon September 30, 2013, 9:47pm 8

Forced it, huh? You still need to show your circuit. Obviously it's unstable.

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