9V Battery Adapter for the Arduino

by djmatic

With just two parts your Arduino goes portable, powered by a 9V battery. Note that these connections are the same ones you'd use to make a plug to connect to a solar cell array, a car lighter plug or a larger battery.

You'll need a 9V battery clip, a 2.5mm power plug, a soldering iron and some solder, and optionally a small piece of heat shrink tubing.

First, solder the battery clip's black (-) wire to the outside connection of the plug. Next, solder the battery clip's red (+) wire to the centre connection of the plug. Optionally, add a piece of heatshrink tubing on the red wire to protect the positive connection.

Once the wires are soldered, slip the heatshrink over the positive connection and gently crimp the wires in place with the small metal tabs. Add some hot glue (not shown) over the connection area for further reliability.

Happy times: