Just started with Arduino

I just recently got an arduino duemilanove and was thinking about using it in a project of mine.

I have an external power supply providing power to the arduino so if I unplug the arduino from my computer after I uploaded my sketch to it, will the sketch still be on the arduino or do I have to have it connected to a computer the whole time to run my program?

Thanks for your help

It will still be in your arduino. It's a stand-alone little computer on a chip (microcontroller) :slight_smile:

so if I unplug the arduino from my computer after I uploaded my sketch to it, will the sketch still be on the arduino or do I have to have it connected to a computer the whole time to run my program?

Once your sketch is uploaded, it is stored in non-volatile flash program memory so it will stay in the chip even with power removed.

Lefty