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From: Terry King
Subject: Re: Single / Multitone Detector (Not DTMF)
Date: Mon, 13 Jan 2003 11:12:02 -0500
Organization: Mountain ClockWorks
X-Newsreader: MicroPlanet Gravity v2.30.1784
Thanks for suggestions; I'm looking at some of the
The 567 is one-tone-at-a-time and I have made stuff
with several of them in the past; they aren't the
most stable possibility, but would probably work.
I was hoping that a decade of silicon development had
some up with my fantasy chip :-)
1: I have several inputs from handheld FRS and/or GMRS
radios, which have several 'calling tone warble'
options, one of which sounds like a typical electronic
phone. I was hoping to be able to pick two tones
from each of these, and to be able to identify which
user was calling. I MIGHT be able to pick one tone,
and detect the time-domain pattern. Hmmm.
2: Maybe I have just carrier-detect from handheld radios.
3: I have DTMF from amateur radio and the phone system.
My hope is to come up with a PIC based system that I can use
and which might be able to be used by others for similar
My application is for access to my home control system and
communications systems from FRS radios used by family members,
and from the phone system. My most immediate need is to
be able to turn on the "road" lights when arriving late at night.
But once I get into the system, lots is possible.
This time of year we end up often walking down the hill thru the snow
from 800 to 1200 feet, depending on what got plowed by whom. The
town doesn't plow OUR road. I have 120V lights up covering most of
the first 800 feet, but I hate to have them on from sunset until
EVERYONE gets home, especially with older kids who may not get home
this night at all...
The rest of the logic and interfacing will be OK, but this funny
tone-detect stuff is problematic right now...
Thanks for the help!
> Are you stuck with specific tones? or can you make
> them anything you want.
Regards, Terry King ...In The Woods In Vermont
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