I have a number of arduinos pro mini both 5v and 3.3V and today I wanted to use one of them and unfortunately it did not have any markings on the bottom side as to which version it is...
is there any other way to distinguish it?
Where electronics enthusiasts find answers.
esklar81 wrote:...which suggests that the voltage is part of the regulator's part number.It is indeed. The microcontroller is the same on the two boards, but the voltage regulator and the crystal are different (the 5V board should have a 16MHz crystal, and the 3.3V board should have an 8MHz crystal).
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