On Tue, Oct 27, 2015 at 11:06 PM, Dennis Lee Bieber
<wlfr...@ix.netcom.com> wrote:
>         It would almost be faster to attach a thin, high-impedance (since one
> doesn't want to weaken the actual sounder) wire to the Piezo buzzer, and
> poll for activity. <G> No false positive from an alarm clock or microwave
> chirping.

Or wire up a second smoke alarm (those things honestly aren't all that
expensive) with the noisemaker replaced by something that signals your
application. Actually, it's probably already been done -
internet-enabled smoke alarms...

ChrisA
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