Re: Honeywell Smartfit research and the start of a generic interface (wish me luck!)

["armagh_elect" <fmcalind@xxxxxxx>]

Hi James
Very interesting reading ...I dabble with the pics...been
using ASM...but recently purchased PIC BASIC PRO ...Rob Davison is
using the Proton pic basic..... I would think someone on the
Homevision list may know the protocol for the honeywell stuff as im
sure i have heard it mentioned there several times if not maybe the
mister house list......
Has Microchip been taken over by Maxim ???
Keep us posted on your progress...
Good Luck
Frank


--- In ukha_d@xxxxxxx, James Derrick <james-ukha@a...> wrote:
> Hi All,
>
> After trying a few different ways of integrating domestic heating
with
> home brew home automation, I have splashed out in a Honeywell
Smartfit
> system in the hope that experimentation will lead to a generic
> interface to the Accessory Port.
>
> So far, I have put on the web details of what Smartfit is, my
existing
> heating system, and the progress so far on making my own interface:
>
> http://www.amarok.demon.co.uk/dl/hvac/index.html
> (click on the diagrams to get a full-size view)
>
>
> Don't get too excited yet- my PIC-based test rig can reliably read
the
> data bits sent across the Smartfit bus, but the packet format is
still
> a mystery to me. With luck, this will only be a matter of time and
a
> generic PIC interface will take shape.
>
> The test rig is based on Maxim PIC chips (10MHz 16F84 single chip
> microcontroller) programmed using Crownhill's PROTON+ BASIC
compiler
> so as to concentrate on the interface rather than assembly
language.
>
> For what it is worth, circuits and BASIC files are available so
please
> feel free to have a go- the more the merrier! If you want HEX
files to
> program PICs, drop me an email but it's early days yet.
>
> My goal is to build an interface that is capable of communicating
with
> the Smartfit unit to both read status and set parameters. The
> client-side interface is likely to be a simple serial such as ASCII
> RS232 or RS485 usable with MisterHouse on a PC. As I'm using PICs,
> other interfaces will be possible.
>
> Wish me luck!
>
>
> James
> ---
> James Derrick
>     james-ukha@a..., Cramlington, England
>     Beyond the Horizon of the place we lived when we were young,
>     In a World of Magnets and Miracles. Pink Floyd.