The mark 2 version of this circuit which was entered into the Dangerous Prototypes 7400 competition has now reached successfully five weeks running on it’s own backup super capacitor. During this period it has maintained the alarm status and powered the indicator LEDs on more then 25 occasions.
The first version ran for seven weeks, but with less LED activity. So there is room to balance costs and backup time with the current 7400 design. An order for some pico power PICs will be sent soon, so the mark 3 version with a few more bells and whistles can be prototyped.
As always, if you would like to be a part of this project in any way, leave a comment here, or at the project site at Launchpad.