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  • For me it was blinking 1 time at a second. By the way, what makes the bootloader blink the pin 13 if there is no sketch loaded, is it a normal sketch ?, and why that don't happen when I upload the "BareMinimum" example ?. Commented Nov 29, 2015 at 15:19
  • @AsadMarmash The bootloader is just software. It runs before the sketch runs if there is a sketch installed. If there isn't it just runs and runs and runs. It blinks the LED because it blinks the LED. That is what the programmer that wrote the bootloader decided to program it to do. It doesn't blink with BareMinimum because BareMinimum doesn't blink the LED, and it is a sketch, so the bootloader runs it. Commented Nov 29, 2015 at 15:21
  • See my answer about the bootloader. The bootloader only flashes the LED 3 times. If it keeps flashing then the supplier must have uploaded the Blink sketch as a default. Commented May 28, 2019 at 21:57