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PICList Thread
'[EE]: touch switch link on PICLIST.COM'
2003\06\17@133757 by Mike Hord

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A few weeks ago (the first day I found the PICLIST) I found a link to a site
which had some info about using a microcontroller to read a plate behind
a dielectric and detect whether a touch has occurred on the other side of
the dielectric.  I think it was in the PICLIST archive somewhere, and I
can't
find it again.  Does this ring a bell with anyone, or did it happen in a
dream?

Mike H.

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2003\06\18@041252 by Nigel Orr

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pic microcontroller discussion list <> wrote on Tuesday, June 17, 2003 6:37
PM:

> A few weeks ago (the first day I found the PICLIST) I found a link to
> a site which had some info about using a microcontroller to read a
> plate behind a dielectric and detect whether a touch has occurred on
> the other side of the dielectric.  I think it was in the PICLIST
> archive somewhere, and I can't
> find it again.  Does this ring a bell with anyone, or did it happen
> in a dream?

I haven't seen it mentioned on piclist, but there are purpose built
controllers for that, I have seen them in the Farnell catalogue, in the
switch section, you might find them at http://www.farnell.com

Nigel
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2003\06\18@092727 by Mike Hord

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Thanks for your help, guys...

It was on bytecraft.com.  But I'll look into the dedicated ICs as well!

Mike H.


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2003\06\19@045138 by gtyler

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I remember it! I think it worked by outputting a square wave  and monitoring
the phase shift when the capacitance of a sensor plate increased due the the
proximity of a finger. Think it might be in a uchip "embedded control
handbook"

George Tyler

{Original Message removed}

2003\06\19@064238 by Brent Brown

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> A few weeks ago (the first day I found the PICLIST) I found a link
> to a site which had some info about using a microcontroller to
> read a plate behind a dielectric and detect whether a touch has
> occurred on the other side of the dielectric.  I think it was in
> the PICLIST archive somewhere, and I can't find it again.  Does
> this ring a bell with anyone, or did it happen

I think it's been talked about here in the past in regard to circuits
for liquid level sensors. Motorola MC33794 E-Field chip recently
mentioned in circuit cellar could be of interest too.

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