I've been using an UNO with a DIP processor for a few weeks - going very well. Acquired a new UNO, SMP edition, that blinks the "L" LED but will not talk with through COM 3 that works well with the other. When first plugged in, Win-XP recognized the new peripheral and I clicked on "install drivers" …

New UNO Won't Talk

system February 20, 2011, 8:01pm 5

Thanks everyone! It's now working great!

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