RE: automating a remote control - relays?

["Keith Doxey" <ukha@xxxxxxxxxxx>]

That would also work for a battery powered remote control but you have
to be
careful on powered equipment as it doesn't provide isolation.

You can actually get clever and use a crosspoint matrix chip as well
because
all remote controls usually have their keys wired into a matrix. That way
you can press any button with a minimum of logic lines

Eg
16 key 4x4 matrix = 4 lines + enable
32 key 4x8 matrix = 5 lines + enable
64 key 8x8 matrix = 8 lines + enable

Keith

-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Nick Austin
Sent: 09 July 2010 17:34
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] automating a remote control - relays?

I've done this using both the CD4016BC and CD4066BC quad bilateral
switches.  Both supplied as standard 14-pin DIP with 4 switches per
package.  Both run from 5 volt power and are switched by standard
5-volt logic signals.

Datasheets:
http://www.fairchildsemi.com/ds/CD%2FCD4016BC.pdf
http://www.fairchildsemi.com/ds/CD%2FCD4066BC.pdf

Nick.

On Fri, Jul 9, 2010 at 10:29 AM, Paul Gale <groups2@xxxxxxx> wrote:
> I'm considering whether to automate a remote control - I can easily
hack
it and bring out the button contacts to then link to a number of relays.
>
> However, I was wondering if relays are the best option - they can be
pretty noisy, especially if the remote needs a key sequence.
>
> If I'm controlling from HomeVision - are there any smarter solutions
that
anyone can recommend?
>
> Paul.


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