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Sensor to measure weight. Answered

Hi everyone,
I am stuck. I am trying to find a method or sensor to do what I want. Basically, I am trying to make a cheap flat weigh scale- light weight , flexible and portable (carried in a brief case or lap top case); thinner than using load cell sensors. I was hoping for a flat compression fabric , foam or piezo resistive pressure sensor, but have not found what I was looking for. It needs to be able to measure 50 to 250 lbs & fit on a counter. Does something like this even exist?
Any suggestions would be most welcome.
Thank you
Appl314





 

4 Replies

user
steveastrouk (author)2011-09-07

The guts of a bathroom scale will be about 250mm x 250mm. That seem eminently transportable to me

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user
rickharris (author)2011-09-06

With any compressible system accuracy is going to be the issue.

However this may be an answer (Quantum Tunnelling Device) QTC works quite well in systems ( I have tried it ) that can have a recovery time (in milli seconds) and is very repeatable.

More information here

Beyoned that I think you should look at taking a set of scales apart and using the guts in your own design.


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user
rickharris (author)2011-09-06

How accurate do you need it to be

must it be certifiable (calibrated)

What skills and materials and budget are you looking at

Why not use a standard personal weighing system (they use load cells measuring the bend in 1 or 2 steel plates.

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user
appl314 (author)rickharris2011-09-06

Thank you.

It does not have to be certifiable, but consistent.
I think a personal weighting system is too bulky and heavy. Is there one that is light weight that I am not aware of?

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