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PICList Thread
'Pressure sensor'
1997\06\06@093914 by David BALDWIN

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       Did anybody already used a pressure sensor?

1997\06\06@135926 by wft

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Hello David

Would you explain more about what you are looking for?  Pressure level
desired?  Cost desired?


David BALDWIN wrote:
>
>         Did anybody already used a pressure sensor?

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1997\06\06@151622 by Daniel

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-----Original Message-----
From:   David BALDWIN [SMTP:.....dbKILLspamspam.....SDM.BEL.ALCATEL.BE]
Sent:   Friday, June 06, 1997 6:38 AM
To:     EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
Subject:        Pressure sensor

       Did anybody already used a pressure sensor?

Yes, we had an app that used Motorola pressure sensors. If you are interested ,
I'll dig up the information.

Daniel
Eagle Designs Corporation
Tel 503 492 2370    Fax 503 667 9613
infospamspam_OUTeagledesigns.com

1997\06\07@104031 by Tom Handley

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re: Pressure Sensor

  David, I have used pressure sensors. What is your application?
I'm mainly familiar with Sensym and Motorola sensors for use in
barometric and altimeter applications.

  - Tom

At 03:37 PM 6/6/97 +0200, you wrote:
>        Did anybody already used a pressure sensor?
>
>

1997\06\07@111429 by Andy Kunz

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At 07:39 AM 6/7/97 -0700, you wrote:
>re: Pressure Sensor
>
>   David, I have used pressure sensors. What is your application?
>I'm mainly familiar with Sensym and Motorola sensors for use in
>barometric and altimeter applications.

Sensym is a Motorola trademark, no?

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\06\07@114950 by Tom Handley

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re: Sensym and Motorola

  Andy, Sensym is a company. "Senseon" is a Motorola trademark.
Motorola combined their sensor division under the "Senseon" name
but they are not related to "Sensym".

  - Tom

At 11:18 AM 6/7/97 -0400, you wrote:
>At 07:39 AM 6/7/97 -0700, you wrote:
>>re: Pressure Sensor
>>
>>   David, I have used pressure sensors. What is your application?
>>I'm mainly familiar with Sensym and Motorola sensors for use in
>>barometric and altimeter applications.
>
>Sensym is a Motorola trademark, no?
>
>Andy

1997\06\07@191340 by Andy Kunz

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At 08:47 AM 6/7/97 -0700, you wrote:
>re: Sensym and Motorola
>
>   Andy, Sensym is a company. "Senseon" is a Motorola trademark.
>Motorola combined their sensor division under the "Senseon" name
>but they are not related to "Sensym".

You are correct.

Gee, maybe some slick P&TO lawyer should have seen that <G>

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\06\09@025814 by David BALDWIN

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I had like to know the precision of the sensor to measure altitude.
Thanks.

David

1997\06\09@031302 by David BALDWIN

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Altimeter is my application, but with a good converter, I don't know
which acuracy I can get from MPX2100 sensor from Mot. Any help? Did you
did your altimeter with a PIC?

Thanks

David

1997\06\09@083102 by Andy Kunz

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At 08:55 AM 6/9/97 +0200, you wrote:
>I had like to know the precision of the sensor to measure altitude.
>Thanks.

The Motorola sensor I used (I don't have the number handy) using a
PIC16C711 w/o any amp on the sensor was accurate to 1/4" of water or 10' of
air per bit change, but I was using quite a number of samples (ie, 16
samples --> 12 bit result).  This was done because there is a slight AC
component to the output of the sensor, which I used to my advantage.

Andy

======================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 USA
             Electronics for Industry & R/C Hobbyists
        "Go fast, turn right, and keep the wet side down!"
======================================================================

1997\06\09@083518 by Andy Kunz

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At 09:10 AM 6/9/97 +0200, you wrote:
>Altimeter is my application, but with a good converter, I don't know
>which acuracy I can get from MPX2100 sensor from Mot. Any help? Did you
>did your altimeter with a PIC?

David,

Check this page for an application I did with the Motorola sensor (I forget
which).

http://www.rcboats.com

Andy

======================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 USA
             Electronics for Industry & R/C Hobbyists
        "Go fast, turn right, and keep the wet side down!"
======================================================================

1997\06\10@030114 by David Howey

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WW> Would you explain more about what you are looking for?  Pressure
WW> level desired?  Cost desired?
I know this doesn't really tie in with the above thread very much, but
does anyone know of a pressure sensor that could be used to detect
breath pressure? I'm thinking of making a MIDI breath controller with a
PIC that would allow me to dynamically alter MIDI parameters like
resonance/cut-off frequency on my JV35 synth by breath control. SO...
all I need is a breath pressure sensor.
Thanks
-Dave
* RM 1.2  * Eval Day 566 * RoboMail -- The ultimate QWK compatible message man
ger.

1997\06\10@194221 by STEENKAMP [M.ING E&E]

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Hi,

I'm looking for a pressure sensor with which I can measure water pressure
up to about 40m of water (about 3bar pressure more that atmosphere).
Would that sensor of yours be able to do that, and if so can you maybe
give me the part number?

Thanx
Niki

> The Motorola sensor I used (I don't have the number handy) using a
> PIC16C711 w/o any amp on the sensor was accurate to 1/4" of water or 10' of
> air per bit change, but I was using quite a number of samples (ie, 16
> samples --> 12 bit result).  This was done because there is a slight AC
> component to the output of the sensor, which I used to my advantage.
>
> Andy

1997\06\11@000922 by Michael S. Hagberg

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i recall a device that measured the speed to change the sound. kind of like
a little wind meter, the faster it rotated the higher the sound. i think it
would be easier to control (like blowing in a musical instr) rather than
trying to maintain a steady presure?

michael

At 08:30 PM 6/8/97 GMT, you wrote:
{Quote hidden}

message man
>ger.
>
>

1997\06\11@051019 by Tom Handley

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re: Pressure Sensor for Water

  Niki, you will need a pressure sensor in the 0-60 psi range. 0-100 psi
sensors are common. For more info on pressure sensors check the following:

     Sensym  : (408) 954-1100
     Motorola: http://design-net.com/senseon/pressure.html

  - Tom

At 09:32 PM 6/10/97 GMT+0200, you wrote:
{Quote hidden}

1997\06\11@073255 by Andy Kunz

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At 09:32 PM 6/10/97 GMT+0200, you wrote:
>Hi,
>
>I'm looking for a pressure sensor with which I can measure water pressure
>up to about 40m of water (about 3bar pressure more that atmosphere).
>Would that sensor of yours be able to do that, and if so can you maybe
>give me the part number?

The one I used was only good to about 4 feet.  Visit
http://www.design-net.com and look up the Motorola sensors.  I think they
have them that will go that far, but you won't have as much precision.

Sounds like you're a diver.  Whatcha making?

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\06\11@135702 by STEENKAMP [M.ING E&E]

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> At 09:32 PM 6/10/97 GMT+0200, you wrote:
> >Hi,
> >
> >I'm looking for a pressure sensor with which I can measure water pressure
> >up to about 40m of water (about 3bar pressure more that atmosphere).
> >Would that sensor of yours be able to do that, and if so can you maybe
> >give me the part number?
>
> The one I used was only good to about 4 feet.  Visit
> http://www.design-net.com and look up the Motorola sensors.  I think they
> have them that will go that far, but you won't have as much precision.
>
> Sounds like you're a diver.  Whatcha making?
>
> Andy
>
Yep, only recently finished my SCUBA course and immediately saw an
opportunity to use a PIC in a custom diving computer.  Always looking for
interresting applications...

Niki

1997\06\11@204827 by Robert K. Isensee

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Hello Dave,

Shades of 2001!

Lucas makes a pressure sensor with a 0 to 5 psi pressure range. It is
packadged for
use in a Blood pressure sensing application during cannulization.(therefore
its
disposible and cheap!!) I don't have complete info right now (the address is
at work) but if you e-mail me I'll get it to you.

Bob Isensee


'pressure sensor'
1997\09\22@174511 by Craig Niederberger
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Hi all,

I'm working on a PIC application to compute average and peak pressures in
a biomedical application, and can't seem to locate sensors--I was
wondering if anyone could help me out.  The sensors themselves need to be
relatively flat--they will measure pressure between human skin and an
object, and thus can't protrude too much lest they do damage to the human
whose skin is being measured.  I've calculated that the pressures to be
measured will be in the range of 0-20 psi.  I've looked high and low on
the web for the last couple of days to no avail.  Can anyone help?

Thanks,
Craig

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @spam@craignKILLspamspamuic.edu ~~~~~~~~~~~~~~~~~~~~~~~~~
Craig Niederberger MD FACS          | Chief, Division of Andrology
University of Illinois at Chicago   | Director Urologic Basic Research
Department of Urology M/C 958       | 312-996-2779   Fax: 312-996-1291
840 South Wood St, Chicago IL 60612 | http://godot.urol.uic.edu

1997\09\22@182950 by )

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Craig Niederberger wrote:

> I'm working on a PIC application to compute average and peak pressures
> in
> a biomedical application, and can't seem to locate sensors--I was
> wondering if anyone could help me out.  The sensors themselves need to
> be
> relatively flat--they will measure pressure between human skin and an
> object, and thus can't protrude too much lest they do damage to the
> human
> whose skin is being measured.  I've calculated that the pressures to
> be
> measured will be in the range of 0-20 psi.  I've looked high and low
> on
> the web for the last couple of days to no avail.  Can anyone help?
>
The kind of transducer you're looking for is more along the lines of a
compression load cell. Made by hundreds of companies such as: Transducer
Techniques, Sensotec, PCB Piezotronics, Eaton LeBow, Entran, Honeywell
Microswitch, Interface, etc. Some of these companies have web pages. I
don't have the addresses handy at the moment.

There are also thin film matrix type force sensors made by companies
such as Force Imaging Technology, Tekscan, and Cooper Instrument
Systems. Basically, these sensors consist of a compressible resistance
compound between two laminated thin sheets of plastic film with
conductive ink like printed circuit traces. Overall, they're much less
that 0.010" thick. Tekscan, I know, does biomedical applications with
sensor arrays for both hands and feet, as well as custom arrays. Brace
yourself, though. They're out to sell you a system which runs about $20k
to $30k (plus sensor arrays). Force Imaging Technology used to have a
small demo kit available for a few hundred dollars.

Hope this is of some help. Maybe this will jar someone else's memory out
there and they know of a cheaper source.

-Frank


Frank Richterkessing

KILLspamFRANK.RICHTERKESSINGKILLspamspamAPPL.GE.COM

1997\09\23@003823 by tjaart

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Craig Niederberger wrote:
>
> Hi all,
>
> I'm working on a PIC application to compute average and peak pressures in
> a biomedical application, and can't seem to locate sensors--I was
> wondering if anyone could help me out.  The sensors themselves need to be
> relatively flat--they will measure pressure between human skin and an
> object, and thus can't protrude too much lest they do damage to the human
> whose skin is being measured.  I've calculated that the pressures to be
> measured will be in the range of 0-20 psi.  I've looked high and low on
> the web for the last couple of days to no avail.  Can anyone help?
>
> Thanks,
> Craig

If you are going for volume, you have to be wary of quick-and-dirty
tricks.
It may be worth investigating the cost of having a custom metal bracket
punched that will take resistive strips on a 'finger'. Don't forget to
use it in a bridge configuration.

If you don't need very accurate measurements, you may get away with
conductive foam.

--
Friendly Regards

Tjaart van der Walt
RemoveMEtjaartTakeThisOuTspamwasp.co.za
________________________________________________________
|        WASP International   http://wasp.co.za          |
|   R&D Engineer : GSM peripheral services development   |
|Vehicle tracking | Telemetry systems | GSM data transfer|
|Voice : +27-(0)11-622-8686  |  Fax : +27-(0)11-622-8973 |
|             WGS-84 : 26010.52'S 28006.19'E             |
|________________________________________________________|

1997\09\23@052958 by mikesmith_ozNOSP*M

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On 22 Sep 97 at 16:34, Craig Niederberger wrote:

> Hi all,
>
> I'm working on a PIC application to compute average and peak
> pressures in a biomedical application, and can't seem to locate
> sensors--I was wondering if anyone could help me out.  The sensors
> themselves need to be relatively flat--they will measure pressure
> between human skin and an object, and thus can't protrude too much
> lest they do damage to the human whose skin is being measured.  I've
> calculated that the pressures to be measured will be in the range of
> 0-20 psi.  I've looked high and low on the web for the last couple
> of days to no avail.  Can anyone help?

As a quick'n'dirty solution, how about a piece of silicon rubber
tube, filled with liquid (or not) and an ordinary pressure sensor
connected to the other end of tube?  The tube would go between skin
and the object.   There are many such pipe-based pressure sensors.
An advantage for a biomed application is that the tube assembly could
be disposable, thus minimising infection risk between patients.
Alternatively, silicon tubing is resistant to sterilisation.
MikeS
<mikesmith_ozNOSP*M.relaymail.net>
(remove the you know what before replying)

1997\09\23@084849 by Lou Calkins

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{Quote hidden}

Have you thought about working with Force Sensing Resistors (FSRs)?  They
basically change resistance proportional to the force on them.  I am not
sure if they are linear (my guess is not), and I am not sure about their
accuracy.

The only information I have is from a company called Interlink Electronics.
The last phone number I had was: (805) 684-2100.  They may have something on
the web, but I have not looked.  Hope this helps.

--- Lou

1997\09\23@123703 by Larry Payne

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part 0 226 bytes
Interlink Electronics has a complete line of Force Sensing Resistor (FSR)
devices
which may satisfy your need. They are at http://www.interlinkelec.com/

I've used their products in several pressure measuring apps.

-larry-

1997\09\23@124946 by Larry Payne

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part 0 252 bytes
After visiting their Web page, I realized that Interlink does not offer their
FSR
sensors on their Web site.  You can call them at 805-484-8855 and request
their FSR Integration Guide and Evaluation Parts Catalog.

Sorry about any confusion,
-larry-


'pressure sensor'
1998\09\21@150340 by Doug Chitwood
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<DIV>I've used conductive foam before for an expermential touch sensor for
a<BR>robot gripper.<BR><A
href="TakeThisOuTDougEraseMEspamspam_OUTetgs.com">RemoveMEDougspamTakeThisOuTetgs.com</A><BR></DIV></BODY></HTML>

</x-html>


'Pressure Sensor'
1998\11\11@161937 by verhage
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A few months back you mentioned having information on the pressure
sensors found in the surplus radiosondes.  It looks like a TO-22 case
with 8 leads.  Do you still have that info?  I'd like to play with
them and try them out on my balloon capsule.

Thanks
Lloyd

1998\11\20@171155 by Jočo Batista Queiróz

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<DIV><FONT color=#000000 size=2>Hi, I'm again</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>I need to find a Pressure Sensor of MOTOROLA
MPX2700ASX/371C-03, and I don't get&nbsp; <BR>nor FARNELL, RS, FUTURE possesses
for sale&nbsp; <BR>The Representatives and Distribuitor's of MOTOROLA in BRAZIL,
at least knew about the existence of the same.&nbsp; <BR>In agreement with IC
Master Site, the said component meets in normal production.&nbsp; <BR>&nbsp;
<BR>Does anybody know where I cannot you buy it?&nbsp; <BR>&nbsp; <BR>Thank you
for any information.</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>thanks,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Joao Batista</FONT></DIV></BODY></HTML>

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1998\11\23@084710 by Jočo Batista Queiróz

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<META content='"MSHTML 4.72.2106.6"' name=GENERATOR>
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<BODY bgColor=#ffffff>
<DIV>
<DIV><FONT color=#000000 size=2>It's not HTML, ok ?</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT><FONT size=2>Excuse-me per HTML in last
mail....</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>I need to find a Pressure Sensor of MOTOROLA
MPX2700ASX/371C-03, and I don't get&nbsp; <BR>nor FARNELL, RS, FUTURE possesses
for sale&nbsp; <BR>The Representatives and Distribuitor's of MOTOROLA in BRAZIL,
at least knew about the existence of the same.&nbsp; <BR>In agreement with IC
Master Site, the said component meets in normal production.&nbsp; <BR>&nbsp;
<BR>Does anybody know where I can buy it?&nbsp; <BR>&nbsp; <BR>Thank you for any
information.</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>thanks,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Joao Batista</FONT></DIV></DIV></BODY></HTML>

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1998\11\23@162731 by Jočo Batista Queiróz

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<DIV><FONT color=#000000 size=2>Hi,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>I need buy a Pressure Sensor Motorola MPX 2700
ASX / 371C-03.</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>But, I don't found in Farnell, RS , Future or
Motorola Distribuitor's and Representant.</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Where I can buy it ?</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Thanks,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000 size=2>Jo&atilde;o</FONT></DIV></BODY></HTML>

</x-html>

1998\11\23@164228 by WF AUTOMACAO

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=?iso-8859-1?B?Sm/jbyBCYXRpc3RhIFF1ZWly83o=?= wrote:
{Quote hidden}

Well well,

Try DOMEX INTERNATIONAL

In Brazil:

(0123) 416522

Boa sorte!

Miguel
Educational Products for PIC/MCS51/MCS96/SAB/MCS251

1998\11\23@165705 by Sarunas Cepulis

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Jo‹o Batista Queir—z wrote:
>
> Hi,
>
> I need buy a Pressure Sensor Motorola MPX 2700 ASX / 371C-03.
>
> But, I don't found in Farnell, RS , Future or Motorola Distribuitor's
> and Representant.
>
> Where I can buy it ?
>
> Thanks,
>
> Jo‹o
Hi,
Try MACRO group. (SEI)
B.R.,
       Saras.

1998\11\24@160027 by Octavio Nogueira

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<META content='"MSHTML 4.72.3110.7"' name=GENERATOR>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT color=#000000 size=2>Hi Joao Batista,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT><FONT size=2>Call 001 407-363-0516 and
ask to talk with Jean Auge.</FONT></DIV>
<DIV><FONT size=2>I always buy Motorola pressure sensor from them and
I</FONT></DIV>
<DIV><FONT size=2>pay $7 instead of $45 here in Brazil.</FONT></DIV>
<DIV><FONT size=2>If you talk to jean, tell him that Octavio gave you his phone
number.</FONT></DIV>
<DIV><FONT size=2></FONT><FONT color=#000000 size=2>Another thing: he speaks
Portuguese.</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
<DIV><FONT size=2>Octavio</FONT></DIV>
<DIV><FONT color=#000000
size=2>==============================================<BR>Octavio Nogueira - <A
href="nogueiraEraseMEspam.....propic2.com">EraseMEnogueiraspampropic2.com</A> ICQ#
19841898<BR>&nbsp;&nbsp; From the creator of ProPic,&nbsp;&nbsp; ProPic 2&nbsp;
now much better<BR>&nbsp;&nbsp;&nbsp;&nbsp; New ProPic 2
homepage:&nbsp;&nbsp;&nbsp; <A
href="http://www.propic2.com">http://www.propic2.com</A>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<BR>&nbsp;&nbsp;&nbsp; PIC Programmer for Windows with down to earth price
<BR>==============================================</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">
   <DIV><FONT face=Arial size=2><B>-----Mensagem original-----</B><BR><B>De:
   </B>Jo&atilde;o Batista Queir&oacute;z &lt;<A
   href="RemoveMEjq96EraseMEspamEraseMECLARET.COM.BR">RemoveMEjq96spam_OUTspamKILLspamCLARET.COM.BR</A>&gt;<BR><B>Para:
   </B><A href="RemoveMEPICLISTTakeThisOuTspamspamMITVMA.MIT.EDU">EraseMEPICLISTspamspamspamBeGoneMITVMA.MIT.EDU</A>
   &lt;<A
   href="RemoveMEPICLISTKILLspamspamMITVMA.MIT.EDU">PICLISTSTOPspamspamspam_OUTMITVMA.MIT.EDU</A>&gt;<BR><B>Data:
   </B>Segunda-feira, Novembro 23, 1998 11:47<BR><B>Assunto: </B>Pressure
   Sensor<BR><BR></DIV></FONT>
   <DIV>
   <DIV><FONT color=#000000 size=2>It's not HTML, ok ?</FONT></DIV>
   <DIV><FONT color=#000000 size=2></FONT><FONT size=2>Excuse-me per HTML in
   last mail....</FONT></DIV>
   <DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
   <DIV><FONT color=#000000 size=2>I need to find a Pressure Sensor of MOTOROLA
   MPX2700ASX/371C-03, and I don't get&nbsp; <BR>nor FARNELL, RS, FUTURE
   possesses for sale&nbsp; <BR>The Representatives and Distribuitor's of
   MOTOROLA in BRAZIL, at least knew about the existence of the same.&nbsp;
   <BR>In agreement with IC Master Site, the said component meets in normal
   production.&nbsp; <BR>&nbsp; <BR>Does anybody know where I can buy it?&nbsp;
   <BR>&nbsp; <BR>Thank you for any information.</FONT></DIV>
   <DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
   <DIV><FONT color=#000000 size=2>thanks,</FONT></DIV>
   <DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
   <DIV><FONT color=#000000 size=2>Joao
Batista</FONT></DIV></DIV></BLOCKQUOTE></BODY></HTML>

</x-html>

1998\11\27@151055 by Jočo Batista Queiróz

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part 0 5505 bytes
<META content=text/html;charset=iso-8859-1 http-equiv=Content-Type><!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"><!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<META content='"MSHTML 4.72.2106.6"' name=GENERATOR>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT color=#000000 size=2>Hi again,&nbsp; <BR>&nbsp; <BR>I thank the
information that it passed me, that were very useful.&nbsp; <BR>I got like this
to locate the necessary material.&nbsp; <BR>&nbsp; <BR>Thank you</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">
   <DIV><FONT face=Arial size=2><B>-----Mensagem original-----</B><BR><B>De:
   </B>Octavio Nogueira &lt;<A
   href="spamBeGonenogueiraSTOPspamspamEraseMEMANDIC.COM.BR">KILLspamnogueiraspamBeGonespamMANDIC.COM.BR</A>&gt;<BR><B>Para:
   </B><A href="EraseMEPICLISTspamEraseMEMITVMA.MIT.EDU">@spam@PICLIST@spam@spamspam_OUTMITVMA.MIT.EDU</A>
   &lt;<A
   href="spamBeGonePICLISTspamKILLspamMITVMA.MIT.EDU">.....PICLISTspam_OUTspamMITVMA.MIT.EDU</A>&gt;<BR><B>Data:
   </B>Ter&ccedil;a-feira, 24 de Novembro de 1998 17:07<BR><B>Assunto: </B>Re:
   Pressure Sensor<BR><BR></DIV></FONT>
   <DIV><FONT color=#000000 size=2>Hi Joao Batista,</FONT></DIV>
   <DIV><FONT color=#000000 size=2></FONT><FONT size=2>Call 001 407-363-0516
   and ask to talk with Jean Auge.</FONT></DIV>
   <DIV><FONT size=2>I always buy Motorola pressure sensor from them and
   I</FONT></DIV>
   <DIV><FONT size=2>pay $7 instead of $45 here in Brazil.</FONT></DIV>
   <DIV><FONT size=2>If you talk to jean, tell him that Octavio gave you his
   phone number.</FONT></DIV>
   <DIV><FONT size=2></FONT><FONT color=#000000 size=2>Another thing: he speaks
   Portuguese.</FONT></DIV>
   <DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
   <DIV><FONT size=2>Octavio</FONT></DIV>
   <DIV><FONT color=#000000
   size=2>==============================================<BR>Octavio Nogueira -
   <A href="TakeThisOuTnogueira.....spamTakeThisOuTpropic2.com">TakeThisOuTnogueiraKILLspamspamspampropic2.com</A> ICQ#
   19841898<BR>&nbsp;&nbsp; From the creator of ProPic,&nbsp;&nbsp; ProPic
   2&nbsp; now much better<BR>&nbsp;&nbsp;&nbsp;&nbsp; New ProPic 2
   homepage:&nbsp;&nbsp;&nbsp; <A
   href="http://www.propic2.com">http://www.propic2.com</A>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
   <BR>&nbsp;&nbsp;&nbsp; PIC Programmer for Windows with down to earth price
   <BR>==============================================</FONT></DIV>
   <BLOCKQUOTE
   style="BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">
       <DIV><FONT face=Arial size=2><B>-----Mensagem
       original-----</B><BR><B>De: </B>Jo&atilde;o Batista Queir&oacute;z
       &lt;<A
       href=".....jq96spamRemoveMECLARET.COM.BR">RemoveMEjq96spamspamBeGoneCLARET.COM.BR</A>&gt;<BR><B>Para:
       </B><A href="spamBeGonePICLIST@spam@spamspam_OUTMITVMA.MIT.EDU">TakeThisOuTPICLISTspamspamMITVMA.MIT.EDU</A>
       &lt;<A
       href="PICLISTEraseMEspamMITVMA.MIT.EDU">RemoveMEPICLISTEraseMEspamspam_OUTMITVMA.MIT.EDU</A>&gt;<BR><B>Data:
       </B>Segunda-feira, Novembro 23, 1998 11:47<BR><B>Assunto: </B>Pressure
       Sensor<BR><BR></DIV></FONT>
       <DIV>
       <DIV><FONT color=#000000 size=2>It's not HTML, ok ?</FONT></DIV>
       <DIV><FONT color=#000000 size=2></FONT><FONT size=2>Excuse-me per HTML
       in last mail....</FONT></DIV>
       <DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
       <DIV><FONT color=#000000 size=2>I need to find a Pressure Sensor of
       MOTOROLA MPX2700ASX/371C-03, and I don't get&nbsp; <BR>nor FARNELL, RS,
       FUTURE possesses for sale&nbsp; <BR>The Representatives and
       Distribuitor's of MOTOROLA in BRAZIL, at least knew about the existence
       of the same.&nbsp; <BR>In agreement with IC Master Site, the said
       component meets in normal production.&nbsp; <BR>&nbsp; <BR>Does anybody
       know where I can buy it?&nbsp; <BR>&nbsp; <BR>Thank you for any
       information.</FONT></DIV>
       <DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
       <DIV><FONT color=#000000 size=2>thanks,</FONT></DIV>
       <DIV><FONT color=#000000 size=2></FONT>&nbsp;</DIV>
       <DIV><FONT color=#000000 size=2>Joao
Batista</FONT></DIV></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>

</x-html>


'Pressure Sensor'
2000\02\20@152508 by l.allen
picon face
I want to sense an analog response to how hard a button is being
pressed. A small button like any membrane keypad type except
rather than just a close or open an output that is continuous ,
doesn't have to linear or anything.
The PIC A/D will read this and use a lookup table.

I have been examining carbon loaded plastic and capacitance type
sensors but I am unhappy with what I have found so far, an off the
shelf solution would of course be best.

If anyone has any tips, links etc I would be grateful.



_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

http://www.psych.auckland.ac.nz

_____________________________

2000\02\20@154132 by Dave VanHorn

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>
>I have been examining carbon loaded plastic and capacitance type
>sensors but I am unhappy with what I have found so far, an off the
>shelf solution would of course be best.

Silicone rubber keys should do this pretty well, especially if the button
bottom is hemispherical rather than round. You'd have to experiment to get
the range of resistances to expect with any given key and pad config, but
it seems reasonably ok.

You might even add a button that is permanently depressed by the keyboard
assembly to some degree to serve as a reference resistance, which should
take out variations in the conductivity of the rubber.
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2000\02\20@174608 by Russell McMahon

picon face
Lance said -

I want to sense an analog response to how hard a button is being
pressed. A small button like any membrane keypad type except
rather than just a close or open an output that is continuous ,
doesn't have to linear or anything.
The PIC A/D will read this and use a lookup table.
If anyone has any tips, links etc I would be grateful.


==================

Lance,


If you can tolerate the potentially larger button size then pneumatics does
this very well - I did this long ago for a disability application with
subsequent analog processing.

An "air switch" is used to drive a pressure sensor which is then read by the
A2D (in your case).

You can buy off the shelf air switches which are usuaully intended for spa
pool or industrial safety applications.
Connection is by small bore tubing. These are usually on the large size.

However, it should be possible to make a plunger and O-ring type switch or a
micro-dome switch which is not much larger than other types.
If a pneumatic system is fully sealed and relies on the internal air for the
physical return of the switch after it is pressed then a leak can be
catastrophic. Instead it is possible to use spring restoring and to have a
controlled leak from the air cavity so that it doesn't lose substantial
amounts of air from the system if pressed intermittently but "goes flat" if
held down. The switches are lightly spring loaded and when released will
slowly draw air back into the system.

If you don't mind size, electrical wholesalers sell both rubber domes about
100mm across and more "normal" looking switches about ?25mm across but with
a pneumatic unit about 30mm^3??? attached. I have a sample somewhere here.
<<ph AK 837 2999>>

Pneumatic connectors, O-rings and tubing are readily available locally (NZ)
so fabricating your own compact switch would be reasonably easy.



     Russell McMahon
_____________________________

>From other worlds - http://www.easttimor.com
                               http://www.sudan.com

What can one man* do?
Help the hungry at no cost to yourself!
at  http://www.thehungersite.com/

(* - or woman, child or internet enabled intelligent entity :-))

2000\02\20@234024 by Russell McMahon

picon face
>>I have been examining carbon loaded plastic and capacitance type
>>sensors but I am unhappy with what I have found so far, an off the
>>shelf solution would of course be best.


Other ideas -

1.     Strain gauge
Fairly cheap
Needs extra instrumentation.

2.    Bimorph Piezo elements (RS have these)

3.    Smothered hot wire?
Just a thought - a heated resistive element whose ability to cool is reduced
as key is depressed against a spring.

4    Spring with optical obscuration as key descends.
Could be quite cheap.
Use eg LED source and LDR (!) or phototransistor plus a shaped mask which
progressively obscures light path.

5    Crimping a plastic / rubber / ??? pipe with airflow therein .
Or block / open an orifice as key moves.
Could be very small at key itself
Needs air source and pressure sensor.
If this is for University experimental use rather than production purposes
this could be quite viable.
A fishtank air puimp good for a few psi can be bought for about $NZ10 (20?)
This could supply a number of switches - especially if the key opens rather
than closes an orifice.
Airflow might also be able to be measured by "interesting" means - eg
turbine/interrupter.
Pressure driven pot? - getting desperate now :-)

6.    Linear pot spring loaded.

7.    Capacitance !!!! (or other proximity)
Could eg drive oscillator and measure frequency.

8.    Linear Hall switch and magnet.


QUESTIONS:

- What is the range of pressing forces involved?

- What is the application?

- How many needed?

- Budget?


regards

           Russell McMahon


'Pressure sensor'
2005\07\31@164952 by Charles Linquist
flavicon
face
I'm looking for a differential air pressure sensor that can measure
1" of H20 full-scale.

Preferably, I would like units that were amplified, although I could
deal with mv output sensors if that was the only option.

The only ones I can find are from All Sensors Inc, and cost $88 each
(from Digi-Key).  Does anyone know of any cheaper source of small
low-pressure sensors?


Charles Linquist

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