Re: Low cost weight sensor ?

On Mon, 22 May 2006 12:40:12 -0700, Jim Stewart <jstewart@xxxxxxxxxxx>
wrote:

Anton Erasmus wrote:

Hi,

I am looking for a low cost weight sensor. I am trying to provide a
indication of the amount of paper available. The empty container is
approx. 1kg, and approx. 10kg full of paper. It should be able to
handle industrial temperature range. A resolution of 1kg would be
acceptable. If I can get 100g resolution, it would be great.
I would prefer SPI or I2C interface, but analog out would be
acceptable - something that can directly interface with a MCU.

It looks like one of those problems that cost
$300 for a few or $.30 for 100k, but not a lot
in between.

It seemed that way to me from googling, but I hoped I just did
not have the right "magic" search term.

Load cells would work, but will be quite expensive.
Springs, levers and opto or hall sensors would
be another possibility.

I was hoping to not have to roll my own.

Regards
Anton Erasmus
.