touch plate switches???

Bob Richards · 2nd March 2011, 06:14 PM

I'm going to build a line preamp and would love to use touch plate switching technology. I researched chips that would support this, but they all seem to require a CPU. I'm trying to find touch plate chips that put out a separate control voltage for each touchplate, something I can buffer and drive a small latching relay with. or at least a binary output that I can decode with a binary to base 10 converter chip. Any help on this would be appreciated much.

CopperTop · 2nd March 2011, 07:18 PM

Hi Humdinger

If you search for capacitive touch sensor ICs you should find plenty. Have a look at this one for example:

ATMEL|AT42QT1010-TSHR|SENSOR, TOUCH, CAP, 1CH, 6SOT | Farnell United Kingdom

macboy · 3rd March 2011, 12:44 PM

The Azoteq IQS127D implements a single touch- and proximity-sensitive button (even through a substrate like glass or plastic) and has simple to use "active on" outputs. One problem is that it comes only in a tniy little SOT-6 package, and another problem is that it's hard to find. One of my favorite component/gadget stores carries it in a pack of 5 including DIP adapters.

Bob Richards · 3rd March 2011, 07:14 PM

Thanks much. I've also found a few others on the web that appear to be useful for someone who doesn't write code. I've wanted to use touchplates for decades, I think since I saw the movie A Clockwork Orange in the late 60's. Now I just need a good clear conductant that you can paint onto frosted plexiglas. That way I can backlight the touch plate/knobule fully, with an LED. Anyone know where I can get paintable (dipable) clear conductant? This is going to be SO COOL!!!

CopperTop · 3rd March 2011, 07:33 PM

I don't know about clear conductive paint, but you can buy sheets of clear acetate coated in Indium Tin Oxide - I think I even got some free samples from somewhere. You could cut pieces out and place them behind your perspex panel. Alternatively you can make electrodes from extremely fine wires which would be practically invisible.

Steerpike · 3rd March 2011, 09:06 PM

If you want a 'touchable' transparent front plate, you might try infa-red LED/phototransistor reflective detectors. Then you just have a piece of tinted plastic or glass with no conductors required.
E.g. http://docs-europe.electrocomponents...6b802aff23.pdf

Itsmee · 4th March 2011, 10:55 AM

This might be what your looking for

Electronics Projects Vol. 22 (With CD) - Google Books

or you could use a PIR detector

2nd March 2011, 06:14 PM	#1
Bob Richards diyAudio Member Join Date: Feb 2011 Location: Portland Oregon, USA	touch plate switches??? I'm going to build a line preamp and would love to use touch plate switching technology. I researched chips that would support this, but they all seem to require a CPU. I'm trying to find touch plate chips that put out a separate control voltage for each touchplate, something I can buffer and drive a small latching relay with. or at least a binary output that I can decode with a binary to base 10 converter chip. Any help on this would be appreciated much.

3rd March 2011, 09:06 PM	#6
Steerpike diyAudio Member Join Date: Jan 2006 Location: Johannesburg, South Africa	If you want a 'touchable' transparent front plate, you might try infa-red LED/phototransistor reflective detectors. Then you just have a piece of tinted plastic or glass with no conductors required. E.g. http://docs-europe.electrocomponents...6b802aff23.pdf __________________ Steerpike's Toybox

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2nd March 2011, 07:18 PM	#2
CopperTop diyAudio Member Join Date: Feb 2009 Location: UK	Hi Humdinger If you search for capacitive touch sensor ICs you should find plenty. Have a look at this one for example: ATMEL\|AT42QT1010-TSHR\|SENSOR, TOUCH, CAP, 1CH, 6SOT \| Farnell United Kingdom

3rd March 2011, 12:44 PM	#3
macboy diyAudio Member Join Date: Oct 2003 Location: Ottawa, Canada	The Azoteq IQS127D implements a single touch- and proximity-sensitive button (even through a substrate like glass or plastic) and has simple to use "active on" outputs. One problem is that it comes only in a tniy little SOT-6 package, and another problem is that it's hard to find. One of my favorite component/gadget stores carries it in a pack of 5 including DIP adapters.

3rd March 2011, 07:14 PM	#4
Bob Richards diyAudio Member Join Date: Feb 2011 Location: Portland Oregon, USA	Thanks much. I've also found a few others on the web that appear to be useful for someone who doesn't write code. I've wanted to use touchplates for decades, I think since I saw the movie A Clockwork Orange in the late 60's. Now I just need a good clear conductant that you can paint onto frosted plexiglas. That way I can backlight the touch plate/knobule fully, with an LED. Anyone know where I can get paintable (dipable) clear conductant? This is going to be SO COOL!!!

3rd March 2011, 07:33 PM	#5
CopperTop diyAudio Member Join Date: Feb 2009 Location: UK	I don't know about clear conductive paint, but you can buy sheets of clear acetate coated in Indium Tin Oxide - I think I even got some free samples from somewhere. You could cut pieces out and place them behind your perspex panel. Alternatively you can make electrodes from extremely fine wires which would be practically invisible.

4th March 2011, 10:55 AM	#7
Itsmee diyAudio Member Join Date: Feb 2009	This might be what your looking for Electronics Projects Vol. 22 (With CD) - Google Books or you could use a PIR detector

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