Re: Sending and receiving addressable contact closures.

[Ake Hedman <akhe@xxxxxxxxxxxxx>]

Alan,

If you are looking for something low cost take a look at 1-Wire and the=20
DS-2406 switch (http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2907)=20
(Also an eight bit version=20
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3818).
 Easy to work with=20
and real low node cost.

We also have some rail road enthusiast working with the Very Simple=20
Control Protocol (http://www.vscp.org)
and there will be some stuff=20
available there for that kind of control situations.=20

/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
>
>
>
>
>
>
>
>
>
>
>
------------------------------------------------------------------------
> *Yahoo! Groups Links*
>
>     * To visit your group on the web, go to:
>       http://groups.yahoo.com/group/ukha_d/
>=20=20=20=20=20=20=20=20
>     * To unsubscribe from this group, send an email to:
>       ukha_d-unsubscribe@xxxxxxx
>       <mailto:ukha_d-unsubscribe@xxxxxxx?subject=3DUnsubscribe>
>=20=20=20=20=20=20=20=20
>     * Your use of Yahoo! Groups is subject to the Yahoo! Terms of
>       Service <http://docs.yahoo.com/info/terms/>.
>
>


--=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
Kryddor/Te/Kaffe: http://www.brattberg.com
Personal homepage: http://www.eurosource.se/akhe
Automated home: http://www.vscp.org



[Non-text portions of this message have been removed]