Several customers have asked if the Defusable Clock can have a custom countdown duration and if the clock can “remember” it. The default firmware allows you to increase the countdown time by pressing the HOUR and MIN buttons before releasing the DET button, but it doesn’t “remember” the new countdown time for the next sequence.
I wrote an alternative version of the firmware for an Airsoft team in Sweden that you may find useful. This version allows you to increase or decrease the countdown time before releasing the DET button, and the new countdown time is stored in EEPROM so that it is the new default. This firmware is available here:
http://nootropicdesign.com/defusableclock/downloads/DefusableClock2.zip
Instructions (also in the source code)
When holding down the red DET button, you can use the MIN and HOUR
buttons to increase the countdown time. To *decrease* the countdown
time, also press the ALARM button while holding down the DET button.
When you release the DET button, the countdown starts and this
countdown value is the new default. It is written to EEPROM and
is saved even if the power is disconnected.