I've created a custom arduino board, using the atmega16u2 serial (SMT), and the atmega328 (not p). I've copied the wiring for both chips to the letter, I've confirmed through programmer arvisp mkII and atmel studio 6, that I can read and load to both chips, and voltages are 5v, no issue. When you …

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nickgammon August 30, 2013, 4:26am 10

What crystal do you have connected?

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