When I bought my aruino uno and connected it to my computer, I tried to make the simple blink circuit(before programming arduino) and suddenly the led started blinking.
Is the blink example is the defualt arduino sketch ?
I am sure that I didn't uploaded any thing to the board.
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Some may have the "Blink" sketch pre-installed, but many don't. However, when there is no sketch installed the board sits in bootloader mode waiting for you to upload a sketch. While it's in bootloader mode the LED pin pin D13 blinks. If your LED is blinking about once a second then it's the Blink sketch. If it's rapidly blinking three or four times per second or so then it's in the bootloader and you have no sketch loaded. |
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