Re: Sending and receiving addressable contact closures.

[Ake Hedman <akhe@xxxxxxxxxxxxx>]

Alan,

Just wanted to add a pointer to my last mail. Hobby-Boards sell boards=20
for the mentioned chip with room for relays.
( http://www.hobby-boards.com/1wireboards/4r1-r1_relay.html
)

Cheers
/Ake

Alan Ainslie wrote:

>
> Some clever guy on our group must know the answer to this.  I have
been
> looking in all the wrong places I guess.:-
>
> I need to send instructions to a number of switches to close or open:
> accessed by address.
>
> I also need to read the status of other switches as inputs.
>
> This is all ON/OFF so no proportionality and I do not want to use a=20
> PC, but
> am happy to make up a central controller and then to make up the
devices
> that go onto the control bus.  Ideally control bus would be two
wires=20
> plus
> the heavy 12V supply to power relays and things.
>
> Anyone any ideas for chip set to do this robustly and
economically.=20=20
> Devices
> will be outdoors.  Everything is 12V only.  Numbers?  Less than 50 of
the
> addressable switches and less than 20 of the input contacts closures.
>
> Application?  Well, almost an automated home: in truth this is to
control
> signals and to read status of various devices on a 7 1/4 gauge
large=20
> steam
> railway located-----in an automated home.
>
> Any railway nuts out there welcome to a day on the Spinney light=20
> Railway in
> Surrey.  Fully signalled at present using authentic 1930s railway
> technology.  new stuff is for a large extension and I really don't=20
> want to
> be running more miles of cables for the mice to eat.
>
> Alan
>
>
>
>
>
>
>
>
>
>
>
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--=20
---
Ake Hedman (YAP - Yet Another Programmer)
eurosource, Brattbergav=E4gen 17, 820 50 LOS, Sweden
Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
Company home: http://www.eurosource.se=20=20=20=20=20=20
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