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Hi,

thanks for all the input!

The proposal to let float the cold end of the voltage divider by simply
connecting it to a PIC input port appears as a rather dirty solution to me,
for due to the protection diodes an undefined current flow "to somewhere"
can happen. (I once operated a 628A by simply connecting a RS232 Rx line to
constant +5V (idle state) via a 1k resistor!)

The proposal with the MOSFET to apply the battery voltage to the divider is
surely professional, but I like most the solution with the PNP transistor
which base is "triggered" via the capacitor! This solution surely consumes
nothing but the base-collector current plus the leakage current through the
capacitor which both are way lower than those 2=B5A of my 1702. May be the =
PNP
can be replaced by a Mosfet.

Will check this out by making a test setup and if any more problems or
enhancements appear I'll let you know!

Thanks again, the PicList is of real help!

Peter


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