user8176: If powering the Arduino (Mega) through the USB port, is a voltage of 5.19VDC acceptable?

user4887: Yes, the ATMEGA328 processor will work without any problem, in fact if you go in the power informations section on the datasheet, you will find that the processor can run from a little less of 3V to a maximum of 5.5V.
Just be careful, because the processor works at that power, but the board will need from 5 to 5.5V.

8176: <p>If powering the Arduino (Mega) through the USB port, is a voltage of 5.19VDC acceptable?</p>
 4887: <p>Yes, the ATMEGA328 processor will work without any problem, in fact if you go in the power informations section on the datasheet, you will find that the processor can run from a little less of 3V to a maximum of 5.5V.</p>

<p>Just be careful, because <em>the processor</em> works at that power, but <em>the board</em> will need from 5 to 5.5V.</p>
