Please help! My son and I are brand new to arduino and programming in general. We successfully loaded the "blink" program onto the Uno and played around with different blink intervals, making the onboard "L" LED blink in different ways.
We let it run while we went to dinner and I came back and there was no blinking. Repeated attempts to re-upload the program, including re- opening the stock example program, have not fixed the issue. I see the amber LEDs blinking showing that I am uploading, but then nothing. I could swear that yesterday the green "L" LED blinked DURING the uploading process, and now it does not.
Did I... Burn the LED out? Screw something else up?
To my knowledge, the only green LED on the Arduino UNO is the Power indicator. If you see no green LED, then this would mean either that your Arduino has no power, that it has been short-circuited, or that it is damaged.
It would be normal for the RX, TX, and L LEDs (all three of which are yellow ) to blink during uploading of your sketch. If you upload the Blink sketch, then the L led should blink yellow after uploading is complete.
If you press and release the reset button, you should see a few quick flashes on the L-LED. If you don't see those, the 328P is either damaged or has lost the bootloader
No. You could not break the board by running a sketch.
Is your computer a "laptop?" Perhaps your computer did not sense a device on the USB port, and "went to sleep" and shut the USB port down.
When you remove-then-insert your Arduino on USB, do you hear the system tone (meaning, device inserted)? If you open Device Manager, can you see the window actively "remove" and "insert" the Arduino USB?
Sorry, I must have been misremembering it's color, since it won't turn on.
Update: the Arduino seems to be functioning fine, since we were able to do the 2nd project (the spaceship) without any trouble. No trouble uploading the sketch.
If you're interested in getting to the bottom of that problem, I would suggest starting by providing responses to the questions in comments #3 and #4 above.
Thank you for looking at this! I guess it hasn't been a major problem, but i am trying to understand every step of this process as me and my 9-year old dig into this amazing box. This blink thing is a puzzle we can't solve
When I hit reset or initially plug in the arduino, the "L" LED does not flash
yes, it is a Mac laptop. I do not hear any sort of "device inserted" tone when I plug the arduino into the computer, but I WAS able to add the relevant port and device and upload other sketches such as the "spaceship" example. When I reset, turn on, or upload a sketch, the "L" LED never blinks.
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on the Arduino UNO is the Power indicator. If you see no green LED, then this would mean either that your Arduino has no power, that it has been short-circuited, or that it is damaged.
) to blink during uploading of your sketch. If you upload the Blink sketch, then the L led should blink yellow after uploading is complete.