Weight Sensor (Second Post)
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I am working on a project where I need to sense a change in weight of
approximately six milligrams with accuracy of +/- 3 milligrams (or better).
I want to feed this into a BS2 and read it out to an LCD display and
possibly do some other control. Does anyone know of a sensor (hopefully
cheap) which will do this? Thanks in advance!
Sorry, but in the first post I forgot to mention that the entire range of
weight on the sensor will be from 0 to 4.5 Grams (0 to 4500 milligrams).
Thanks!
Tom
approximately six milligrams with accuracy of +/- 3 milligrams (or better).
I want to feed this into a BS2 and read it out to an LCD display and
possibly do some other control. Does anyone know of a sensor (hopefully
cheap) which will do this? Thanks in advance!
Sorry, but in the first post I forgot to mention that the entire range of
weight on the sensor will be from 0 to 4.5 Grams (0 to 4500 milligrams).
Thanks!
Tom
Comments
inexpensively in that range. What you may consider is using a strain
gauge mounted on a very long piece of metal , perhaps a metalic yard
or meter stick. Placing your wieght at the end may provide
sufficient force at a distance to be measurable accurately.
From the strain gauge (a flexible resistance), you will need to use
it as a leg of a resistance bridge and possibly feed that to a
instrumentation amp.....
Just an idea if you can't find something pre-made inexpensively, and
I don't have any good websites to point you too. Anyone else??
-Martin Hebel
SelmaWare Solutions
http://www.selmaware.com
S-Plot Pro - Graphical Data Acquisition and Control
Southern Illinois University Carbondale
http://wwww.siu.edu/~imsasa/elm
--- In basicstamps@egroups.com, Tom Welle <twelle@a...> wrote:
> I am working on a project where I need to sense a change in weight
of
> approximately six milligrams with accuracy of +/- 3 milligrams (or
better).
> I want to feed this into a BS2 and read it out to an LCD display
and
> possibly do some other control. Does anyone know of a sensor
(hopefully
> cheap) which will do this? Thanks in advance!
>
> Sorry, but in the first post I forgot to mention that the entire
range of
> weight on the sensor will be from 0 to 4.5 Grams (0 to 4500
milligrams).
> Thanks!
>
> Tom
small load cells. Be prepared for some priceyness.
Steve
Steve Roberts: sroberts@s...
AD7730 from ANALOG DEVICES is a Bridge Transducer A/C for weigh scale
measurment applications that accept low level signals directly from Load
Cell and outputs a serial digital word.I'm going to use it with BS2 to
control the weight of some products.
Regards,
Mohamed Refky
>From: Tom Welle <twelle@a...>
>Reply-To: basicstamps@egroups.com
>To: "'basicstamps@egroups.com'" <basicstamps@egroups.com>
>Subject: [noparse][[/noparse]basicstamps] Weight Sensor (Second Post)
>Date: Fri, 14 Jul 2000 11:52:24 -0500
>
>I am working on a project where I need to sense a change in weight of
>approximately six milligrams with accuracy of +/- 3 milligrams (or better).
>I want to feed this into a BS2 and read it out to an LCD display and
>possibly do some other control. Does anyone know of a sensor (hopefully
>cheap) which will do this? Thanks in advance!
>
>Sorry, but in the first post I forgot to mention that the entire range of
>weight on the sensor will be from 0 to 4.5 Grams (0 to 4500 milligrams).
>Thanks!
>
>Tom
>
>
>
>
>
________________________________________________________________________
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AD7730 from ANALOG DEVICES is a Bridge Transducer A/C for weigh scale
measurement applications that accept low level signals directly from Load
Cell and outputs a serial digital word.I'm going to use it with BS2 to
control the weight of some products.
Regards,
Mohamed Refky
>From: Tom Welle <twelle@a...>
>Reply-To: basicstamps@egroups.com
>To: "'basicstamps@egroups.com'" <basicstamps@egroups.com>
>Subject: [noparse][[/noparse]basicstamps] Weight Sensor (Second Post)
>Date: Fri, 14 Jul 2000 11:52:24 -0500
>
>I am working on a project where I need to sense a change in weight of
>approximately six milligrams with accuracy of +/- 3 milligrams (or better).
>I want to feed this into a BS2 and read it out to an LCD display and
>possibly do some other control. Does anyone know of a sensor (hopefully
>cheap) which will do this? Thanks in advance!
>
>Sorry, but in the first post I forgot to mention that the entire range of
>weight on the sensor will be from 0 to 4.5 Grams (0 to 4500 milligrams).
>Thanks!
>
>Tom
>
>
>
>
>
________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com