DigiChron is a Pebble app that is intended to operate similarly to a Casio digital watch. A Casio GWM5610 G-Shock was used as my model. The app has a passing resemblence to the Casio, but the main idea is to operate as a real digital watch does and to provide a similar feature set.

This is a watchapp, not a watchface, because it needs to have interaction in order to set timers, operate the stopwatch, etc. As such it would normally exit if the user clicks the back button. I have overridden that behavior to make it less likely that the user exits by accident. To exit the app, the user must long-click the back button.

General Features:

• Open source under the MIT license.
• Multiple functions available by clicking the DOWN button.
• All functions can be used at the same time. No blocking.
• Shows watch battery percentage and charging state on status bar.
• Shows bluetooth connectivity on status bar.
• Vibrates on bluetooth connectivity changes.
• Does not require the phone to function, other than to install.
• Supports both white-on-black and black-on-white display modes.

Main Features:

• Shows time, day or date, and seconds.
• Obeys the 12/24H setting in the Pebble settings.

Timer Features:

• Two independent countdown timers, maximum time 24 hours.
• Pressing any key turns off active alarms even if the user is not on the timer screen.
• Timers remember their settings on app exit and resume on restart.
• Hold UP and DOWN buttons to increment or decrement faster.

Stopwatch Features:

• Stopwatch with lap and split times, maximum time 100 hours.
• Stopwatch updates 5x per second, displays to 1/10 while running, but captures time to 1/100 when the stop button is clicked.
• To save battery, the stopwatch update slows to 1x per second after five minutes, but still maintains full accuracy in the background.
• Stopwatch will continue after exiting and restarting the app.

Button Mappings:

All Faces:
    BACK        Clear alarms that are currently active.
    DBL-BACK    Invert display colors.
    LONG-BACK   Exit the app.
    DOWN        Next function.

Main Face:
    SELECT      Change between date and day display.

Timer Faces:
    SELECT      Start and stop the timer. In setting mode
            switch between hours, minutes, and seconds.
    LONG-SEL    Enter or exit setting mode.
    UP      Increment the time in setting mode.
    DOWN        Decrement the time in setting mode.

Stopwatch Face:
    SELECT      Start, stop, and continue the timing.
    LONG-SELECT Reset the stopwatch.
    UP      When the timing has been stopped with SELECT,
            switch between split and lap display.

Future Features:

These are some features that I would like to add. I have tried to architect the code to make it as easy as possible to add them.

• Alarm function.
• Second time zone function.
• Multiple lap times in the stopwatch.
• Alternate look & feel, such as an analog display version.