I improved GPS watch by adding RTC to use it acturally.
Almost of the parts are common to Adafruit's Neogeo watch. I added RTC, a few buttons and on/off switch and changed mainboard from Flora to Pro Trinket 3v and battery back pack for Trinket.
This one can be charged with USB micro cable.
By adding voltage divider with 2 carbon resisters, It can show the volume of battery. I have already written rainbow Led code. I used it for this battery checking mode.
Its downstair has mainboard, accelerometer/magnet Sensor, Real time clock and lipoly battery 3.7v 400mah.
I added code for cpu sleep mode and watch dog timer, too. It works for about 26 hours. Before this improving, It works for only 8 hours.
