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Topic: L led on pin 13 (Read 553 times) previous topic - next topic


Hello guys, I am setting up my new Arduino UNO SMD R2. I find that, as soon as USB port is connected, Power LED is turned on but L led on pin 13 is also turned on, which starts to blink and never stops. I have not even finished set up and  not running any code. Could someone please tell me whats happening?


That's normal.  When you flash a new chip with a bootloader, that's what it does to indicate that it's working.  Once you start writing sketches to it, it stops blinking.


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