Hold the circuit with the help of a third hand tool and wire the GPS connections to FLORA according to the circuit diagram. Make sure the wires are not longer than they need to be, and sit flush to the board.
My third hand tool has heat shrink tubing over the grippy alligator clips. This was Collin Cunningham's pro tip, and prevents scratching my circuits and their components!
Trim, strip, and solder the wire connections of the accelerometer/compass according to the circuit diagram.
Insert the switch into D10 and GND on the busy side of the FLORA board. Bend out the leads to hold it in position and solder the joints.
This big tactile button makes it easy to switch watch modes by holding down the whole face of the watch for a few seconds.
Verify that your solder connections are secure with a multimeter.
Before you proceed, test the GPS and accelerometer with the sample sketches provided with their respective code libraries. The next steps will make it hard to correct any bad solder joints or stray wires, so don't skimp on testing the circuit now!
The watch code will allow you to adjust which LED is at 12 o'clock, so the orientation of the ring doesn't matter.
Allow the glue to set up for at least an hour before trimming, stripping, and soldering the ring's wires to pads on FLORA according to the circuit diagram. Load the NeoPixel test code to be sure the ring is connected and functionaing properly.
It turns out the wires around the outside of the circuit aren't super durable (catches on clothing), so if we were you or had this project to do over again, we'd solder the NeoPixel ring's wires via the inside of the ring before glueing the ring to FLORA.
The circuit is finished! Now let's make it a watch.