Arduino getting really hot?
While running one of my projects, my Arduino is getting really hot. It's swtiching somewhere around 14 I/O's really fast (im not sure exactly how fast, but its refreshing somewhere around 2.5 milliseconds each time). The chip gets really warm, and to burning hot in about 20 mins. The project runs fine (I've tested for at least an hour, with no ill effects) but Im just wondering if its normal and/or safe. Also the voltage regulator chip gets really hot if i run the same sketch with a 9v wall wart rated at 350 ma, and also with a wall wart rated 7.5v at 2.14 A (the v-reg on the arduino board doesnt get hot if i run it off USB). Should I be concerned? -Astroboy907