Re: Led-switch Alternative

[ian.bird@xxxxxxxxxxxxxxxxxxxxxxx]

Hi Frank

I am also experimenting with these for some touch buttons I am building. I
am using the QT160 parts (6 buttons), which ones are you looking at?

If you are going to have your LED's in the same plate you are using for
touch sensing you will need to capacitively decouple every component of
the LED i.e. one cap before the LED, one after it and another after the
resistor. I also asked Quantum about dimming using PWM for LED's in this
situation and they did not know as they had never tried it. The potential
problem being the continual switching of the LED on and off might upset
the capacitance field sensing circuitry. I guess the alternative would be
something like a digital pot but I don't know whether that would work or
not.

>From what I can see it would not be too difficult to make a one or up
to
six button switch plate and give it the driving logic to switch low
voltage coils in relays. These relays could then control the LD11 units as
Gareth would like to do.

Ian







"Frank Mc Alinden" <fmcalind@xxxxxxx>
19/03/2005 05:51
Please respond to ukha_d


To:     <ukha_d@xxxxxxx>
cc:     (bcc: Ian Bird/CV/Novartis)
Subject:        Re: [ukha_d] Led-switch Alternative



Hi Gareth

> And mebe we could figure out how to use these to control a 240v signal
> from an LD11 ?

I assume you mean the manual contacts on the LD11 ..??......Currently if
i
need to operate dry contacts to switch 240xv  i would use  xPL-DMX  since
i
have the Dmx controller and relay board....and xPL has a Dmx plugin.....im
sure the something similiar applies to xAP and others....
No Cbus .........????

Frank


----- Original Message -----
From: "Gareth Cook" <g@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Saturday, March 19, 2005 6:23 PM
Subject: Fw: [ukha_d] Led-switch Alternative


>
> And mebe we could figure out how to use these to control a 240v signal
> from an LD11 ?
>
> G.
>






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