Alan,

On Thu, 31 Mar 2005 16:44:18 +0100, Alan B. Pearce wrote:

> One idea I have had, but I think they are all too slow to actually
> do it, is to feed the 60kHz straight into an input, and then have a software
> phase lock loop on it, but somehow I just cannot see it working in a PIC,
> unless the super clock speed of a dsPic could do it. Essentially a tuned
> circuit hung on a PIC input is the way I was looking at doing it. If it is
> possible to use a couple of comparators as amplifiers if need be, then so be
> it.

Well you could just receive the signal and decode it (the data rate is *really* low) and again Maplin used to 
sell receiver and decoder kits - I think I have an uncompleted one somewhere.  I'm not sure you could use a 
PLL because if I remember rightly the data is sent by interrupting the carrier, but it's a while since I 
looked at this and I may be wrong.

The problem is the receiver, because the signal isn't very strong and is very susceptible to interference.  
Best to have the receiver in the loft, away from all the noisy computers and such, and feed the decoded data 
down to the PIC.

Cheers,



Howard Winter
St.Albans, Herts


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