Four ways to power up the Arduino Uno
- Batteries (9V) with a battery connector
Feeding power to Arduino: the ultimate guide - unknown
www.open-electronics.org
... for example for no reason it will be possible to apply voltages exceeding the 5 V socket even by a single Volt, since the board’s integrated circuits would burn immediately ...
Battery Powering Arduino Uno
Powering Arduino With a Battery
Make your Arduino projects portable by using a battery for power. From the Uno and Mega documentation pages:
"The board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable.
If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts." ...
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