Arduino UNO R3 Resets itself

Using Arduino Installation & Troubleshooting
#1

I have an Arduino Uno R3, and it can run sketches fine other than it resets itself every 10-30 seconds for no reason.

I have checked the board for any visual problems such as cracked components or foreign objects, but the board is clean and I can't seem to find any problem with it other than half the time when I try to upload a sketch it says "Serial port 'COM5' already in use. Try quitting any programs that may be using it."

So far I havn't checked if it works fine on battery power.

As you could imagine, having your arduino reset every 10-30 seconds for no reason can be very annoying..

#2

it can run sketches fine other than it resets itself every 10-30 seconds

With nothing connected to the board?
Is anything getting hot?
Is there static electricity around?
Is it resetting all the time just sitting and running a code like blink?

#3

Thanks for a quick reply.

Nothing connected but the USB cable to my computer.
Nothings getting hot.
It's a cold and damp day, there doesn't appear to be static.
Running the blink code, it blinks like it should for around 10-30 seconds, and then resets. Same with a blank code.

Extra info: It does blink like it should when it resets, and no I havn't tried on external power yet.

#4

Does it, blink like it should when it resets, blink like it should when it resets etc. ?

#5

Yeh, it runs fine.... Reset. Runs fine....Reset etc

#6

And I timed how long it worked until it reset. Each time I timed it was different. So I'm assuming it's not having some sort of code overload, where you would think it would be at least consistant

#7

UPDATE

It works fine on battery power. I am therefore asssuming that it's my computers fault (or the USB cable).

#8

You might have some kind of USB dock syncing software that may be polling the Arduino and causing it to reset.

#9