The watch base (and what will eventually be attached to the strap) is composed of 3 main sections, the battery, the vibration alert, and the power switch / charging port.
To keep the design as simple as possible, the build combines a 2 position switch, a JST-PH connector, and a lipo battery to create a 2 state circuit. In one switch position, the lipo battery provides power to the watch. In the other switch position, the lipo battery is connected to the charging port. This means that the watch can EITHER be on OR in a charging enabled state. Allowing both charging and powering would require extra logic, and is a minimally needed feature. Since the watch can be powered while programming, you can test away without draining the battery.
1.) insure the battery fits properly into the base
This is a good idea to verify our fit. If the battery cannot properly fit in the designed space, we may have to cleanup or redo our base print.
2.) Assemble the JST-PH connector / switch
Both the power / charging switch sit next to eachother. Gluing them together before assembly is required. After gluing, solder the charging port + to the left switch lead. Then, solder a micro wire lead to the opposite switch end (Leaving only the center with no connections yet)
3.) glue switch / charging port module in place
this will secure your control logic into the base. You may need to trim some of the Base frame to properly fit your switch / charing port module.
4.) cut connection plug from battery and add a micro lead wire to ground end
5.) solder battery ground / extra ground lead to battery charging port ground pin
6.) solder battery positive to middle switch pin
Once connected, this will enable the 2 position switch to direct the battery twards either the charging positive, or twards supplying power.
7.) test voltage / charging capabilities
Before you continue, make sure everything works! The switch position closest to the charging port is the off/charing mode. The opposite direction, the on mode. Most lipos I have ordered come somewhat chared, but you may need to charge yours a bit.
8.) test spacing
Once you complete each major addition, it it's a good idea to make sure everything still fits together as it should. Waiting till the final assembly may create more of a headache to fix any sizing issues.
Updated June 3, 2014