Hello to all,

I  want to design a small fire alarm panel for my home, to augment my
existing alarms, using some sort of addressing scheme for the smoke
detectors.  I plan to use two wire detectors that short the line when in
alarm.  I had debated using a voltage divider system with a current limiting
line resistor as the top half, and different values of resistance between
each detector and the line as the bottom half.  I would then use the 16c72's
A/D capability to read the divider and determine which head(s) were in
alarm.  Does anyone have an idea how to do this differently - possibly using
some sort of addressing scheme?  I know addressable detectors are available,
but I assume the algorithm used to read these is proprietory.

I will also need to keep a 12 volt, 10ah, lead/acid battery charged and
would appreciate any ideas here.

Thanks in advance for your ideas.


Rod

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