DC Power Jack

There are two ways to power your Arduino: you can use the USB connector to connect to a computer or portable power pack or you can plug into a wall adapter. USB can be used to power and program. DC can only be used for power - but it's great for when you want to connect your Arduino and leave it plugged in for a long term project.

This is the DC Power Jack:

The technical specifications for the jack is:

2.1mm inner diameter, 5.5mm outer diameter with Positive Tip

That's just the mechanical size of the plug in case you're looking to match it up. It's an extremely common power plug size, so it isn't too hard to find a matching power plug. Sometimes they're just referred to as "2.1mm DC Plug"You can use a wall adapter like this:

You can use any adapter that is Center Positive and 7 to 12VDC output - we recommend 9V DC if possible. Check the following photo for the symbol that indicates Center Positive and for the 9V output text. The Arduino is fairly rugged and can survive plugging in the wrong adapter as long as the voltage isn't higher than 20V but it's 'stressful' to the 'duino and you should aim for 9V!

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