RE: [Development] Lights, 12 or 14 bit micro

["Keith Doxey" <ukha@xxxxxxx>]

Hi John,

I dont believe the parts cost will be any higher, the 16Cxx parts cost less
than 8 x 12Cxx so that will save some money. Losing the PIC shouldnt be a
problem bacause the PIC would be optoisolated from the triacs.

In either option, if mains got back to fry the PIC it would almost
certainly
fry a few other things as well. Having said that, in all the lighting
controllers I have ever had to repair, the worst that happened was that the
triac took the opto isolator out as well but it didnt damage any of the
control electronics.

I have the connectors to fit the Rabbit. I cant get them in a 26 way (2x13)
so I bought the 80 way (2x40) as it said they were easily cuttable. I
figure
13+13+13=39 so very little wastage there then. WRONG.....you loose 1
position when you cut so you can only get 2 13's and a 12 from a 40.

I'm certain I can find a supplier for the 26 way given enough time but at
least I can work on a PCB layout.

Keith

> -----Original Message-----
> From: Dr John Tankard [mailto:john@xxxxxxx]
> Sent: 09 June 2001 17:24
> To: UKHA
> Subject: [ukha_d] [Development] Lights, 12 or 14 bit micro
>
>
> Mainly for Keith,
>
> As you know I have been away and doing some work on the project. Here
is
> what i have done:-
>
> 1) gone through the various versions of my lighting prototype to find
the
> best version to port.
>
> 2) Tested out the Rabbit core.
>
> 3) Checked out both my compiler and ICEPIC for which parts it supports
> and the cost to switch to other parts.
>
> As result neither my compiler or my ice will support the 12 bit parts,
It
> will cost 99USD to expand my compiler to cover 12 bit along with the
14
> bit parts it already works with. My ICE is much more expensive,
perhaps
> 300 quid to convert. So as I see it I have three choices:-
>
> A) upgrade
> B) bit bash in assembler
> C) switch to a 14 bit part.
>
> The first option i think is to expensive, the second is ok but will
take
> some/a lot of time. The third is easy for me but will make it harder
for
> Keith. It woul mean one 16Cxx part for 8 outputs, rather than 8 12cxxx
on
> the same board as the triac's.
>
> The last option does have other plus points, I will have a extra
serial
> port which will allow control from othrt than tcp/ip if needed, much
more
> RAM, only 25 bytes on the 508 41 bytes on the 509, compaird with 192
> bytes on most of the 14 bit parts, also there would be no address
problem
> as one micro would handle all 8 outputs.
>
> There is a down side, the parts cost is greater, if the pic gets zaped
> you will loose all 8 channels.
>
> Any comments
>
>
> John
>
>
>
>
>
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> http://www.automatedhome.co.uk
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