strain gauges
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Posts: 46,084
Hi. I'm a mechanical engineer that just recently completed a
mechatronics graduate class that employed the basic stamp. I loved
the class and want to continue using the basic stamp for work related
problems. As such, I was wondering if anybody out there has
interfaced strain gauges to the basic stamp and if so, could you
please tell me what you used. I would love to configure my basic stamp
to collect strain date for me.
mechatronics graduate class that employed the basic stamp. I loved
the class and want to continue using the basic stamp for work related
problems. As such, I was wondering if anybody out there has
interfaced strain gauges to the basic stamp and if so, could you
please tell me what you used. I would love to configure my basic stamp
to collect strain date for me.
Comments
jbechtel@e... writes:
> Hi. I'm a mechanical engineer that just recently completed a
> mechatronics graduate class that employed the basic stamp. I loved
> the class and want to continue using the basic stamp for work related
> problems. As such, I was wondering if anybody out there has
> interfaced strain gauges to the basic stamp and if so, could you
> please tell me what you used. I would love to configure my basic stamp
> to collect strain date for me.
>
You will likly want to normalize the strain gage output for a 0 to 5 or 0 to
10 volt range. The strain gauge output will go into an analogue to digital
converter. The A/D data can then be easily be read and used by the stamp.
[noparse][[/noparse]Non-text portions of this message have been removed]
signal before you can put it directly into an A/D converter. On the
strain gages I have dealt with (for determining load on steel rolling
mills), the gage outputs a few millivolts per volt excitation
proportional to the amount of strain (rated in microinches per square
inch I believe). So the max we get out of these things, with 5V
excitation, is not even 100mV. We have a card in the PLC rack
specifically for this type of signal so we can deal with it easily,
but if you wish to put that value into the stamp you'll need to
amplify it some before sending it into an A/D converter.
Basically inside the strain gage there is a circuit called a
Wheatstone bridge, which can sense a very small change in
resistance. One of the elements in the bridge is the strain gage
which varies in resistance as strain varies. Check out this link for
some basic theory and simple circuits:
http://www.omega.com/literature/transactions/volume3/strain2.html
Also, if you put 'strain gage circuit' in on a Google search you will
get a bunch of hits with some sites that may be able to help you out
with some circuitry.
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> In a message dated 5/23/2003 8:28:47 AM Pacific Daylight Time,
> jbechtel@e... writes:
>
> > Hi. I'm a mechanical engineer that just recently completed a
> > mechatronics graduate class that employed the basic stamp. I
loved
> > the class and want to continue using the basic stamp for work
related
> > problems. As such, I was wondering if anybody out there has
> > interfaced strain gauges to the basic stamp and if so, could you
> > please tell me what you used. I would love to configure my basic
stamp
> > to collect strain date for me.
> >
>
> You will likly want to normalize the strain gage output for a 0 to
5 or 0 to
> 10 volt range. The strain gauge output will go into an analogue to
digital
> converter. The A/D data can then be easily be read and used by the
stamp.
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
outputs of strain gage based load cell.
I use AD7730 for weigh scale applications.
look at this link for load cell fundamental:
http://www.measurespec.com/tips/principles.htm
>From: "Hernck" <jbechtel@e...>
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] strain gauges
>Date: Fri, 23 May 2003 15:22:31 -0000
>
>Hi. I'm a mechanical engineer that just recently completed a
>mechatronics graduate class that employed the basic stamp. I loved
>the class and want to continue using the basic stamp for work related
>problems. As such, I was wondering if anybody out there has
>interfaced strain gauges to the basic stamp and if so, could you
>please tell me what you used. I would love to configure my basic stamp
>to collect strain date for me.
>
>
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