What exactly is the difference between the 5v and 3.3v versions of the Arduino Pro mini? Since the Pro Mini doesn't incorporate any voltage regulation circuitry (that I know of), and the Atmega chips usually run off of 2.7-5v, what's different between a Pro Mini 3.3v, and a 5v Pro Mini just hooked u…

Arduino pro mini: 5v vs. 3.3v

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