Some interesting thermal images of an Arduino Mega that seem to back up the "VIN should be less than 7 volts" advice we often give. http://australianrobotics.com.au/news/fuelling-your-arduino-why-you-should-use-an-external-power-breakout Rob

Thermal images of a Mega

Coding_Badly May 18, 2012, 6:59am 10

...and the AVR is quite warm compared to other voltages.

The author claims the processor is warmer.

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