arduino UNO. Arduino 1.0.3. The old sketch I have on the arduino works fine. It reads a pot and serial.prints the value. The problem is that I'm unable to upload a new sketch. The sketch compiles, begins to upload and then just sits there at about 80%. Never finishes. I have to unplug it or reset it…

Could upload before, now unloading a sketch doesn't complete.

nickgammon January 31, 2013, 8:14pm 4

What did the loopback test show?

Also try a different PC/Mac. (A friend's, a laptop, whatever). That rules in/out the PC or the board.

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