Re: Led-switch Alternative

["Frank Mc Alinden" <fmcalind@xxxxxxxxxxxxxx>]

Hi Ian

> They are smt but not too small a footprint. I can mail you a couple if
you
> have any trouble getting them.

Thanks for the offer...will try and source some dip versions....Just an
idea
if you going to use a seperate pcb for the button but have a mother board
in
the same housing....put leds on the motherboard and use lite pipes ...??

Frank

----- Original Message -----
From: <ian.bird@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, March 20, 2005 9:30 AM
Subject: Re: [ukha_d] Led-switch Alternative


>
> > Yes i recall you mentioned the 6 button unit before ...the ones i
have
> are 1
> > button qt113d...but i would really like to try the 6
button.....Where
> did
> > you source yours from....?
>
> I got mine from Farnell.com
>
> They are smt but not too small a footprint. I can mail you a couple if
you
> have any trouble getting them.
>
> > and would need some intelligence to dim / brighten the leds
> True. The outputs are simply on/off with few brains at all.
>
> Ian
>
>
>
>
>
>
>
>
> "Frank Mc Alinden" <fmcalind@xxxxxxx>
> 19/03/2005 15:32
> Please respond to ukha_d
>
>
>         To:     <ukha_d@xxxxxxx>
>         cc:     (bcc: Ian Bird/CV/Novartis)
>         Subject:        Re: [ukha_d] Led-switch Alternative
>
>
>
> Hi Ian
>
> > 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?
>
> Yes i recall you mentioned the 6 button unit before ...the ones i have
are
> 1
> button qt113d...but i would really like to try the 6 button.....Where
did
> you source yours from....?
>
>
> > 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
>
> Oh Bugger!!......I have only bench tested the Qt113d , havent tried it
> with
> the leds...I might try and used sheilded wire for the touch probe....
>
> >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.
>
> Will find out very shortly if its going to be an issue..........;-)
>
>
> > 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.
>
> True but ..the output would need buffered as it doesnt seem to drive
leds
> and would need some intelligence to dim / brighten the leds
>
> Frank
>
>
>
> ----- Original Message -----
> From: <ian.bird@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Sunday, March 20, 2005 5:54 AM
> Subject: Re: [ukha_d] Led-switch Alternative
>
>
> >
> > 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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