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Sensor to measure weight.

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





 


The guts of a bathroom scale will be about 250mm x 250mm. That seem eminently transportable to me
rickharris5 years ago
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.


rickharris5 years ago
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.
appl314 (author)  rickharris5 years ago
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?