Re: Low cost weight sensor ?

"Anton Erasmus" <nobody@xxxxxxxxxxxxxxxx> wrote in message
news:42g97292vmtg52rbbu4negmk2nev5jaaui@xxxxxxxxxx
On Wed, 24 May 2006 14:39:00 GMT, Frnak McKenney
<frnak@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

[snip]

Thanks for all the ideas. It looks like all the weight measuring
sensors uses some sort of spring form material which deflects under
the weight. One then measures the amount of deflection, from which the
weight cab be calculated. The less deflection one can accommodate, the
more expensive the sensor. Have anyone used piezo electric material to
measure weight ? Would a piezo speaker be suitable ?

How about placing a piezo disk under the paper stack with the piezo wired as
an electro-mechanical oscillator. The frequency of oscillation will depend
on the load mass. Under excessive load the oscillator may not start though.

Peter


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