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'[OT]: Croaking People Detector [was Crocking Frog,'
2001\08\22@233216 by Dan Michaels

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Peter Peres wrote:
>I have just discovered that a self heated thermistor can detect people and
>large moving objects as long as they move some air past it. This should
>work fine if there are no fans (or wind) blowing into it.
>

Talk about your croaking frogs - there may be a better use for
that, Peter.  ;-)

Tape a couple of those to your upper lip, and you've got a
sleep apnea detector that signals whether you stop breathing
in the middle of the night - which as it turns out is a fairly
common occurrence. Snore, drool, swizzle, stop breathing, gasp,
awaken. Puts strain on the heart, causes high blood pressure,
etc.

best regards,
- dan michaels
http://www.oricomtech.com
==========================

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2001\08\22@234435 by Jinx

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> Tape a couple of those to your upper lip, and you've got a
> sleep apnea detector that signals whether you stop breathing
> in the middle of the night - which as it turns out is a fairly
> common occurrence. Snore, drool, swizzle, stop breathing, gasp,
> awaken. Puts strain on the heart, causes high blood pressure,

Don't they use something like this for babies ? Post-natal wards,
those susceptible to cot death ? Some breath detector anyway

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2001\08\22@235715 by Kevin Maciunas

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On 23 Aug 2001 15:45:29 +1200, Jinx wrote:
> > Tape a couple of those to your upper lip, and you've got a
> > sleep apnea detector that signals whether you stop breathing
> > in the middle of the night - which as it turns out is a fairly
> > common occurrence. Snore, drool, swizzle, stop breathing, gasp,
> > awaken. Puts strain on the heart, causes high blood pressure,
>
> Don't they use something like this for babies ? Post-natal wards,
> those susceptible to cot death ? Some breath detector anyway
>

As a parent of such a child - yes and no.  The monitor consisted of a
base with some firm(ish) vinyl tubing on its underside.  There was a
microphone on one end of the tube and the other end was sealed.
Compression of the air in the tube due to breathing was detected.  Very
simple, and effective.  There are newer detectors which incorporate
other detection strategies (doppler, for example) but the one we used
was very reliable and simple... [and had no PIC in it :-)  or any other
processor :-)]

/Kevin
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Kevin J. Maciunas              Net: spam_OUTkevinTakeThisOuTspamcs.adelaide.edu.au
Dept. of Computer Science      Ph : +61 8 8303 5845
University of Adelaide         Fax: +61 8 8303 4366
Adelaide 5005 SOUTH AUSTRALIA  Web: http://www.cs.adelaide.edu.au/~kevin

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2001\08\23@180742 by Peter L. Peres

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Dan Michaels <.....oricomKILLspamspam@spam@USWEST.NET> wrote:
> Talk about your croaking frogs - there may be a better use for
> that, Peter.  ;-)
>
> Tape a couple of those to your upper lip, and you've got a
> sleep apnea detector that signals whether you stop breathing
> in the middle of the night - which as it turns out is a fairly
> common occurrence. Snore, drool, swizzle, stop breathing, gasp,
> awaken. Puts strain on the heart, causes high blood pressure,
> etc.

I suspect that they would prevent sleep apnea by being hot and keeping you
awake and slapping your lip while pushing little cries.

I had other things in mind, such as car entry detection without door
switches, turning on lights by sensing people entering rooms (passing door
jamb) etc.

They could also be used as door opener button with no moving parts (touch
removes enough heat to cause switching). Fan/ventilation sensing is
another application. For example mounted as a fan controller in an attic
it would sense when there is natural wind (by stopping the fan
periodically), and avoid turning it on if there is.

They can also be used to sense objects that conduct heat better than air
placed upon them. Such as sensing plates or cups placed on the pedestal of
a vending/filling machine etc. I'd use a thermistor film for this (ITO
maybe). With ITO and XY analog readout the position of the object could be
determined.

A PIC would be a good idea to monitor and remove false signals.

These are not low power devices. A 47 ohm thermistor tried like this ran
60mA at 12V hot and 80-120mA active (cooled by a desk fan at 2 feet). It
was not hot enough to cause discomfort at touch.

Peter

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