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PICList Thread
'[PIC:] Tension Guage'
2004\02\26@230211 by SavanaPics

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I am looking for a sensor that can be used with a pic that will measure
tension. I thought about a spring and a pot but that leads to a lot of uncertainty
when it comes to accuracy.  Has anyone used such devices or know of a
reasonable source for such a sensor?

Eddie Turner, kc4awz

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2004\02\27@005630 by Russell McMahon

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flavicon
face
> I am looking for a sensor that can be used with a pic that will measure
> tension. I thought about a spring and a pot but that leads to a lot of
uncertainty
> when it comes to accuracy.  Has anyone used such devices or know of a
> reasonable source for such a sensor?

What force range and accuracy do you require?

You can buy "fishing scales" which perform the same function as the
traditional spring scales. There will be an analogue voltage somewhere
inside and possibly a voltage to frequency converter which makes interfacing
to any PIC easy.

You can use kitchen digital scales - typically 2 kg and 5 kg ratings
available. Similar but higher precision and more expensive ones are
available. These scales typically contain a load cell - 4 strain gauges in a
bridge - and an analog to digital converter. In cheaper scales this is a
voltage to frequency or pulse width converter. These are made as compression
scales BUT they also work in tension just as well. Suitably connecting  to
the face of the load cell will allow a proper in-line tension device to be
produced.

You can buy bare load cells but getting them from scales will almost
certainly be cheaper. The load cell and electronics can be (and may well
need to be) removed from the scale body. I'm currently using such a load
cell in compression but tension would be almost as easy.



   RM

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2004\02\27@011815 by Steve Smith

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When u have built it come and fit my missus with one please

Steve....

-----Original Message-----
From: pic microcontroller discussion list
[spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU] On Behalf Of Russell McMahon
Sent: 27 February 2004 05:53
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Subject: Re: [PIC:] Tension Guage

> I am looking for a sensor that can be used with a pic that will
measure
> tension. I thought about a spring and a pot but that leads to a lot of
uncertainty
> when it comes to accuracy.  Has anyone used such devices or know of a
> reasonable source for such a sensor?

What force range and accuracy do you require?

You can buy "fishing scales" which perform the same function as the
traditional spring scales. There will be an analogue voltage somewhere
inside and possibly a voltage to frequency converter which makes
interfacing
to any PIC easy.

You can use kitchen digital scales - typically 2 kg and 5 kg ratings
available. Similar but higher precision and more expensive ones are
available. These scales typically contain a load cell - 4 strain gauges
in a
bridge - and an analog to digital converter. In cheaper scales this is a
voltage to frequency or pulse width converter. These are made as
compression
scales BUT they also work in tension just as well. Suitably connecting
to
the face of the load cell will allow a proper in-line tension device to
be
produced.

You can buy bare load cells but getting them from scales will almost
certainly be cheaper. The load cell and electronics can be (and may well
need to be) removed from the scale body. I'm currently using such a load
cell in compression but tension would be almost as easy.



   RM

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2004\02\27@044557 by Brian Clewer

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Eddie wrote:

>
> I am looking for a sensor that can be used with a pic that will measure
> tension. I thought about a spring and a pot but that leads to a
> lot of uncertainty
> when it comes to accuracy.  Has anyone used such devices or know of a
> reasonable source for such a sensor?
>
> Eddie Turner, kc4awz
>

What is the tension in?  A steel wire?
A load cell would do this if you are able to put it in series with the wire,
but there is a non contact device out there (I designed it myself :-)   look
at http://www.appmeas.co.uk .  It's the one on the left in the new product
range.

Brian.

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2004\02\27@045841 by Jan-Erik Soderholm

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Brian Clewer wrote :

> but there is a non contact device out there (I designed it
> myself :-)   look at http://www.appmeas.co.uk .  It's the one
> on the left in the new product range.

Hi !
Now, English isn't my native language, but shouldn't
"Accuracy:  <1 %" rather be "Accuracy:  >99 %" ?

:-) :-)

Jan-Erik.

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2004\02\27@060117 by Brian Clewer

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Jan-Erik wrote:

>
> Brian Clewer wrote :
>
> > but there is a non contact device out there (I designed it
> > myself :-)   look at http://www.appmeas.co.uk .  It's the one
> > on the left in the new product range.
>
> Hi !
> Now, English isn't my native language, but shouldn't
> "Accuracy:  <1 %" rather be "Accuracy:  >99 %" ?
>
> :-) :-)
>
> Jan-Erik.

Yep, thanks for pointing that out... It's not my company, I just designed
the electronics...  I will tell them though. ;-)

Best regards,
Brian.

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2004\02\27@194203 by Win Wiencke

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> I am looking for a sensor that can be used with a pic that will measure
> tension. I thought about a spring and a pot but that leads to a lot of
uncertainty
> when it comes to accuracy.  Has anyone used such devices or know of a
> reasonable source for such a sensor?

If there isn't much travel you might consider gluing a small rare earth
magnet on a leaf spring.  You can measure the deflection of the spring with
a Hall effect transistor.  It's awkward to calibrate but quite reproducible
once you've done it.

Win Wiencke

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2004\02\27@210621 by SavanaPics
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sounds crude, but that might work.  Actually there only about 1.5 to 2" of
travel (if that) and the max grams to be measured is somewhere in the
neighborhood of 80 to 100

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2004\02\28@121221 by James Nick Sears

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Just looked at that meter - cool device!  Not that I have a use for one
right now, but just out of curiosity, what does one of those babies cost?

Nick


{Original Message removed}

2004\02\28@123958 by Al Shinn

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Brian,
Neat Idea. You should change that "w" in your name to a "v"!!
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Looking forward,
Al Shinn

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2004\02\28@133057 by Brian Clewer

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Nick wrote:


> Just looked at that meter - cool device!  Not that I have a use for one
> right now, but just out of curiosity, what does one of those babies cost?
>
> Nick

Unfortunately I am unable to tell you that...  The device was designed by my
company and it is sold by the guys who advertise it on their web site.  If
you want to find out more I would suggest contacting them.   I'll take all
comments onboard though.

Brian.

>
>
> {Original Message removed}

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