RE: Homevision Relay boards ... Interested?

["Phil Harris" <phillip.harris1@xxxxxxx>]

Yes ... which is why we have to set up the output port (board/relay
"address" and status) and then set a "Go" bit to make
sure that no partial
commands are operated upon.

We were just concerned at the cost of something like the Sylvia boards -
£170 for an eight relay board and I needed at least 12 channels just
for
curtain control. Using up 1 output port for a possible 64 relay channels
seems like an acceptable tradeoff to us.

We are still batting ideas around on this and it may be possible to do it a
little more elegantly (or it may prove completely impractical) but it was
just a thought.

Phil

> -----Original Message-----
> From: Alancc [mailto:alan.cc@xxxxxxx]
> Sent: 12 October 2001 18:54
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Homevision Relay boards ... Interested?
>
>
> Does the HV not operate one outputs one at a time, i.e. carry out its
> instructions in a sequential manner?
>
> Alancc
> ----- Original Message -----
> From: Phil Harris <phillip.harris1@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Friday, October 12, 2001 6:53 PM
> Subject: [ukha_d] Homevision Relay boards ... Interested?
>
>
> >
> > Hiya Guys,
> >
> > Ian B and myself have been sitting here this afternoon trying
> to design a
> > relay board to control my electric curtains ... we thought that
> instead of
> a
> > purpose built board to do exatcly what I need it might be
> useful to have a
> > general purpose relay board.
> >
> > Throwing around ideas we have come up with the following
"rough
> description"
> > and are wondering whether there would be much interest from the
> group for
> > this as either a PCB or a built unit.
> >
> > The board will take up a complete output port on HV. Four of the
port
> lines
> > will be "relay select" lines, a fifth would be a
"status" line (On/Off)
> and
> > a sixth would be used as a "set" line to get the relay
board to read the
> > output port and perform the requested setting.
> >
> > For example to turn on relay 4 you'd set the bottom four lines
> on the port
> > to OFF,ON,OFF,OFF (Binary Coded Decimal for 4), the
"status" line to ON
> and
> > then the "set" line to ON to action the command.
> >
> > This would give you sixteen individually addressable relay
outputs that
> > would retain their state until changed again or until the power
> went off.
> >
> > It was discussed that the remaining two output lines could be
used as
> "board
> > select" lines which would enable up to 64 individually
> addressable relays
> to
> > be controlled from a single HomeVision output port with the
> boards planned
> > as being stackable or daisychainable units.
> >
> > Now, we haven't looked too deeply into this so we have no idea
what kind
> of
> > costs would be involved or even at the moment what the
> programming for the
> > output ports would be like but we were wondering what kind of
interest
> there
> > would be from the group for such a board if we were to get it
working.
> >
> > Anyone interested if we decide to progress this further?
> >
> > Phil
> >
> >
> >
> > For more information: http://www.automatedhome.co.uk
> > Post message: ukha_d@xxxxxxx
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> > List owner:  ukha_d-owner@xxxxxxx
> >
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>
>
>



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