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Building a device that clips to your belt and tracks how much time you spend inside and outside

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Step 12: Prepare common ground for the button/GPS/LED

Picture of Prepare common ground for the button/GPS/LED
We now start tying together electrical components that will share the common ground on the side of the digital pins.  We solder together the wire that has the ground for the GPS unit, the button (going through the 2.2K Ohm resister first) and another wire that will serve as the ground for an LED (described later) and tie all of them into the small green wire that will actually connect to the Arduino Uno.  This allows the GPS unit, button and LED to share the only ground pin on that side of the Uno.
 
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