Just bought a new Uno board. Out of the box the surface mount LED next to pin 13 blinks continuously when plugged into USB port. I wired up an external diode to output 13 and it also blinks at the same time. When I hit the reset button and the blinking momentarily stops and then starts blinking ag…

Pin 13 blinks continuously

system July 20, 2011, 4:23am 3

Uno is selected as board type.

I do not see any options for serial com. Only Com3 shows up. What should you use for a USB port usually and how do you change it?

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