Kronos

Analog stopwatch for the Fitbit Ionic & Versa

Start/Stop

Main control button, does exactly what it says. Press this button to start timing, press it again to stop.

Clear/Lap

Used to clear the timer (when the timer is stopped) or save a lap time (when the timer is running).

Read below for more details on the operation and control of Kronos.

Kronos is licensed under the GPL V3.0. The source tree is available for browsing here and a tarball is available here.

Main display

• Clear/Lap - Upper right hand corner
This button changes its image and meaning depending on whether the stopwatch is running or stopped.
• Stopped - the button appears as a yellow circular arrow (). Pressing the button will clear the time to 0 and delete all lap times.
• Running - the button appears as a yellow lap counter (). Pressing the button will save the current time as the next lap.
• Start/Stop - Lower right hand corner
Again, this button changes its image and meaning depending on whether the stopwatch is running or stopped.
• Stopped - the button appears as a red arrow (). Pressing the button starts the timer (and changes the button to a green double bar).
• Running - the button appears as a green double bar (). Pressing the button stops the timer (and changes the button to a red arrow);
• Laps - Lower left hand corner
This button appears as a white list (). and brings up a scrollable display showing all the laps that have the saved. Note that the last line of this list is the total elapsed time that is being measured.

Analog watch face

A normal stop watch face with marking that go from 1 to 60. Note that there are hour and minute and second hands and, like on a normal watch, the minute and second hands count from 1 to 60 but, unlike on a normal watch, the hour hand also counts from 1 to 60. As you can see, the image above on the left is showing a stopped time of 3 hours, 45 minutes and 7.42 seconds while the image on the right is showing a running time of 3 hours, 45 minutes and 9 seconds.

Note the subtle difference between the appearance while the timer is stopped (the image above on the left) and the appearance while the timer is running (the image above on the right.

• This stopped image shows the hundredths of a second for the current elapsed time as 2 digits in the center of the watch face. This hundreths value is only shown when the watch is stopped (there's no point in displaying this number when the watch is running as it would just be too confusing for human eyes that can't track it and, therefore, would provide no benefit for significat battery drain overhead).
• The start/stop button shows as red when the watch is stopped and green when the watch is running. From this you can see that the color of the start/stop button indicates the current running state of the watch while the shape of the start/stop button indicates what will happen when you press the button.
• The clear/lap button changes from a circular arrow icon (clear function) to a lap icon (lap function) as appropriate.

Lap display

Each time the lap button is pressed (while the timer is running) Kronos saves that lap time. This display shows all of those saved laps. In addition, stopping the timer while there are laps saved will cause an implicit, final lap to be saved. (If there are no current laps then stopping the timer will only save the total elapsed time.)

There's no built in limit on the number of laps that can be saved (although you could eventually run out of memory on the Fitbit device but you'd have to save a lot of laps to hit that limit).

The last line of the display always shows the total elapsed time that is being measured. Note that, just like for the analog disply, the hundreths of a second data is only displayed while the timer is stopped. Also, the label on this line will change between Elapsed (when the time is stopped) and Running (while the timer is running).

The clock () button on the upper right just returns back to the main, analog display.

Lap display

Timing things is nice but, especially when timing long running events, it's helpfull to be able to see the current wall clock time. Tapping the center of the analog watch face switches its display from stop watch to wall clock, as illustrated above. Tapping the center of the watch face again switches back to the stop watch face.

It's fairly obvious what is being displayed as the watch face goes from 1 to 60 when the stop watch is being displayed to 1 to 12 when the wall clock time is being displayed.

Note that all of the stop watch buttons are fully operational while in wall clock mode (although you can't see the effect of the operations, start/stop, clear/lap work and you can bring up the lap list if desired).