RE: xPL-LCD PICS

["Ward, David" <DAvid.Ward@xxxxxxxxxx>]

I made a little PCB for a previous employer that had a QT11x socket (I used
115s because they had the no-recalibrate option) and a relay
On that board I had two 78L05 regulators to try and prevent any relay
switching noise interference with the QT, it may have been overkill but I
only had one chance at the PCBs and it needed to work


http://www.apple.com/airportexpress/

fantastic little wireless access port/bridge/print server/analogue and
digital audio streaming thing
and if you use a keyspan USB IR receiver it will send the IR to the host PC
via the Airport express

trouble is that Apple have really designed it to be used with a WiFi laptop
as a 'remote control'  and it only streams audio in Apple loss less format

DVD Jon created Justeport to stream any AAC loss less file to it and Rogue
Amoeba have airfoil, which routes any Mac audio via the airport express

I think xPL a xPL <-> iTunes connector might be the answer,  then a
xPL enabled LCD like yours or IR and pronto would give me the remote
control I need

Dave




-----Original Message-----
From: Frank Mc Alinden [mailto:fmcalind@xxxxxxx]
Sent: 24 March 2005 10:42
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] xPL-LCD PICS



Hi Dave

> I have to admit that the QT110 and QT115 that I used to use to control
> interactive exhibits 'hardly' ever false triggered once set up.

This could be my problem....not setup properly.....

> I also used to run the QT devices from a separate linear regulator IC
> and associated filter caps, a 1R resistor in series with the supply to
> the regulator could also help blocking noise by creating a slightly
> higher impedance path on the supply.

It was being powered by the pic icd so im assuming that would be pretty
clean....

> IIRC the cap should be matched to the capacitance of the
sensor,  I used
> to have a QT11x demo board (the one with the two AAA batteries)  and a
> range of caps that I used to determine the capacitance required for a
> particular sensor,  and a piece of SIL strip socket on the
final circuit
> to plug the caps into.

So how was it determined...??? I suppose i should have a real
good read of
this qprox stuff....

> Could it be possible that the banana plug sensors are the 'wrong way
> around' for the QT to operate reliably?  I.e. the large area
which would
> be more sensitive to touch is inside your box
> It may be better to have a sensor that is wider than it is deep, for
> example's sake just use a washer with a wire connecting to
the QT device

Quite possible...but  im also using the banana plug as an led
holder ....

> HTH and keep up the inspirational work ;)

Thanks for the feedback and pointers


>BTW I like the LCD where did it come from?   I was luck enough to be
> given an Airport Express for Christmas and I am trying to think of the
> neatest solution to control the iTunes server remotely

Got it here in Melbourne...PLED LCD  .......no backlit required.....

Whats a Airport Express...???

Frank


----- Original Message -----
From: "Ward, David" <DAvid.Ward@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, March 24, 2005 9:25 PM
Subject: RE: [ukha_d] xPL-LCD PICS


>
> Frank,
>
> Good idea, a software filter could help, ignoring nonsensical presses
> whilst in menus etc would also make it more robust.
> I have to admit that the QT110 and QT115 that I used to use to control
> interactive exhibits 'hardly' ever false triggered once set up.
>
> IIRC the cap should be matched to the capacitance of the
sensor,  I used
> to have a QT11x demo board (the one with the two AAA batteries)  and a
> range of caps that I used to determine the capacitance required for a
> particular sensor,  and a piece of SIL strip socket on the
final circuit
> to plug the caps into.
>
> I also used to run the QT devices from a separate linear regulator IC
> and associated filter caps, a 1R resistor in series with the supply to
> the regulator could also help blocking noise by creating a slightly
> higher impedance path on the supply.
>
> What QT device(s) are you using?
>
> Just had another though
> The QT devices operate by 'transferring charge' from the
sense capacitor
> to the in circuit capacitor - when the voltage on that cap reaches a
> threshold the output operates. The sense cap is formed between your
> finger and the sense plate.
>
> Could it be possible that the banana plug sensors are the 'wrong way
> around' for the QT to operate reliably?  I.e. the large area
which would
> be more sensitive to touch is inside your box
> It may be better to have a sensor that is wider than it is deep, for
> example's sake just use a washer with a wire connecting to
the QT device
>
> If I get a chance (and I can find them) I may have a play with the QT
> device I have around here somewhere
>
> HTH and keep up the inspirational work ;)
>
> Dave
>
> BTW I like the LCD where did it come from?   I was luck enough to be
> given an Airport Express for Christmas and I am trying to think of the
> neatest solution to control the iTunes server remotely
>
>
>
> -----Original Message-----
> From: Frank Mc Alinden [mailto:fmcalind@xxxxxxx]
> Sent: 24 March 2005 09:57
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] xPL-LCD PICS
>
>
> Hi David
>
> > Have you considered putting a washer around the socket?
> > It could go in front or behind the panel....
>
> Yep tried that yesterday , behind the panel didnt make any
> difference....I
> also changed the capacitor from 4n7 to 10nf...but it  started false
> triggering...?? generating heaps of xpl trig messages.....Are you
> suppose to
> debounce the qprox outputs ?? ..... i now have a 50msec debounce ....
>
> Frank
>
> ----- Original Message -----
> From: "Ward, David" <DAvid.Ward@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Thursday, March 24, 2005 8:48 PM
> Subject: RE: [ukha_d] xPL-LCD PICS
>
>
> >
> > Very nice Frank
> >
> > Have you considered putting a washer around the socket?
> > It could go in front or behind the panel....
> >
> > Dave
> >
> > -----Original Message-----
> > From: Frank Mc Alinden [mailto:fmcalind@xxxxxxx]
> > Sent: 24 March 2005 09:13
> > To: ukha_d@xxxxxxx
> > Subject: [ukha_d] xPL-LCD PICS
> >
> >
> > Hi All
> >         I have now put some pics on my website of the
xPL-LCD  ....If
> > interested in having  a look..Follow the xPL ..link........
> > http://skybax.rapidhoster.co.uk/~armagh/index.html
> >
> >
> >
> > Frank
> > www.armaghelectrical.com.au
> >
> >
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> >
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