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Fixed typo in title
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edit approved Oct 14, 2015 at 13:33
Osh Mansor
edit approved Oct 14, 2015 at 13:33
Osh Mansor
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Why does the PIN 13 LED of Uno R3 blink every tmetime I upload some code?

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sixter
sixter
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Why does the PIN 13 LED of Uno R3 blink every tme I upload some code?

I was driving a relay from Arduino Uno R3 Pin 13. I observed that every time I upload some code the led on the board designating pin 13 would blink. I'm curious why this is so. I understand that the serial LED blinks cause there's a serial transmission but why an IO pin?