Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!hplabs!hp-ses!hpcuhb!hpscdc!rkarlqu
From: rkarlqu@hpscdc.HP.COM (Rick Karlquist)
Newsgroups: sci.electronics
Subject: Re: How to convert weight to volts?
Message-ID: <5770019@hpscdc.HP.COM>
Date: 17 Jul 89 16:06:49 GMT
References: <7903@etana.tut.fi>
Organization: Hewlett-Packard, Santa Clara Div.
Lines: 15

> I'd like to build a small (pocket-size) weight scale, with a range of
> about 1 to 20 kilograms and accuracy about 1%. If I get voltage, I can
> surely handle the rest. But what to use as the converter?
> 
> The catch: I prefer the converter not to cost more than $20.
> --
> Juha Kuusama, kuusama@korppi.tut.fi ( ...!mcvax!tut!korppi!kuusama)
 
Interlink Electronics, Santa Barbara, CA makes "Force-sensing resistors"
They are much cheaper than strain gages and also don't require exotic
instrumentation amplifiers either.  Should be ideal for your application.
Their phone number is (805)-965-5155.

                                      Rick Karlquist
                                      rkarlqu@hpscdc.hp.com