On 25 Aug 97 at 15:20, Glenn Johansson wrote:

> >I'm working a lot with scales using PIC's. The best way, and the only way
> >I'm working, is with strain-gauge load cells. You have to pay special
> >atention on the amplification, or use no amplification at all if you use
> >some special A/D.
>
> How much do those cells cost? What about springs and some simple
> motion control
>  sensor?

I wouldn't like to predict accuracy / long term repeatability - this
is how the early digital bathroom scales worked - springs and a
slotted wheel / counter system - and they seemed to give a different
result every time you stepped on them.  (within seconds - not days,
guys <g>)
If you wanted to try the idea, you could get a cheap set of spring
kitchen scales and a mouse, hook the thing up so one mouse axis spun
when you put a weight on scales and do the quadrature trick, or
 you could even just read it using the standard serial output from
mouse.
MikeS
<mikesmith_oz@relaymail.net>

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