Ken

Sounds like a GREAT idea.  I am going to take a look at it...  This is nice to
Comm with a HOME REMOTE DEVICE, or what ever you can dream up.  I will certain
like to have this circuit and Codes in my tool box of tricks..

Thanks for making available

Dan

Ken Boak wrote:

> PIC Listers,
>
> I have been experimenting with getting  PICs to talk to one another
> over the public telephone network. The early trials of this are
> proving to be successful.
>
> I have a design for a PIC 16F84A based project, which I call the
> Remote Access Terminal or RAT for short.
>
> Using just an 'F84A, it can dial a DTMF number and send a V23 modem
> message to another PIC.
>
> The hardware to do this should cost less than $10.
>
> All the DTMF generation and V23 modem tone synthesis is done in under
> 512 instructions - leaving another half kbytes for the user's
> application programme.
>
> A typical application would be remote datalogging or perhaps a device
> to turn on your central heating remotely using just your mobile phone.
>
> The hardware is flexible and the techniques are open to
> experimentation using other processors  - the F628 and F877 would
> make obvious good choices allowing more features than the humble F84.
>
> I also have DTMF decoding an V23 decoding done in firmware running on
> a 16F877.
>
> The routines are free of charge to all those who wish to use them for their
> own experimentation - all I ask is
> feedback on how you get on.
>
> The information is here:
>
> www.geocities.com/kenboak/rat_ring.html
>
> Here you will find acces to the schematics, firmware, data and also a
> discussion forum.
>
> I hope that this is of interest.
>
> Ken
>
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