Thx Loadstarsensors are $1200 for the first one and then $350
Omron seems to have interesting scales http://www.gizmag.com/go/2929/ http://www.healthgoods.com/shopping/health_and_fitness_products/body_fat_analyzers.asp I have seen them priced as low as $30 so the it should be possible to get sensors for something like $10 as I was hoping. The prices of digital scales with USB connetions have been unbelievably expensive. I hear they are charging $10000 for a single scale. So this Omron scale seems to be a revolution in this area. After discovering Omron and its prices I phoned again to the people selling the $10000 scales and they said that Omron was just a piece of garbage or at least must be because if it costed a lot less than the sensors they could buy. I guess I try to get a hold of one Omron scale with an USB connection and see how it works. The graph in this page http://www.healthgoods.com/shopping/health_and_fitness_products/body_fat_analyzers.asp is basically what I wanted to do in J and maybe still will do if I can get the kg data in The calculations are simple Child Body Fat % = (1.51 x BMI) - (0.70 x Age) - (3.6 x gender) + 1.4 Adult Body Fat % = (1.20 x BMI) + (0.23 x Age) - (10.8 x gender) - 5.4 where male gender= 1, female=0. BMI = kilograms per meter squared Only need to register time and kg Adults Women Men anorexia < 17.5 underweight <19.1 <20.7 in normal range 19.1-25.8 20.7-26.4 marginally overweight 25.8-27.3 26.4-27.8 overweight 27.3-32.3 27.8-31.1 very overweight or obese >32.3 >31.1 severely obese 35 - 40 morbidly obese 40 - 50 That made me wonder how they can claim such obscene prices for a few lines of code on the $10000 scales that are only doing these calculations. If you really want to mesure fat in the body you need to have a scale that measures the body covered in water as well as dry measurement 2008/8/5 Joey K Tuttle <[EMAIL PROTECTED]> > At 08:48 +0000 2008/08/05, Björn Helgason wrote: > >> I am interested in finding digital load sensors that I can use in >> combination with a J application. >> >> What I have myself found so far is so expensive that it is prohibitive. >> >> What I like to know is where I can get cheap sensors that I can hook to an >> USB port on my PC and I can then use to give me input of a persons weight. >> >> So if anyone of you guys knows where I can get this I would appreciate >> hearing about it. >> >> > As a package, it may be hard to find reasonable prices. But you may be able > to build something to suit your needs. An interesting looking data > collection module, including a load cell input, can be found at - > > http://www.leobodnar.com/products/BU0836-LC/ > > you could probably use an interface like this and a relatively low cost > digital bathroom scale to build something. Maybe just a USB a/d converter in > conjunction with something like - > > > > http://scales-n-tools.com/index.php?main_page=product_info&cPath=11&products_id=425 > > I saw (but cannot find this time around) a page where someone illustrated > taking a strain-guage bathroom scale apart and building a USB connection to > make a platform that would sense where a force was applied. Seems that > bathroom scales have 4 strain-guages in a bridge configuration to try to > make accurate measurements possible. That is part of the issue of course... > > A good source of sensor articles and projects including USB interfaces is > the magazine "Nuts and Volts" - > > http://www.nutsvolts.com/ > > There is a California company that advertises "low cost" load cells, > including USB connected ones - > > http://www.loadstarsensors.com/iloaddigital.html > > but I didn't sign up to see what their price actually is. > > Interesting quest, I would be interested in what you find. > > - joey > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Björn Helgason, Verkfræðingur Fugl&Fiskur ehf, Fornustekkum II, 781 Hornafirði Po Box 127,801 Selfoss , t-póst: [EMAIL PROTECTED] gsm: +3546985532 Landslags og skrúðgarðagerð, gröfuþjónusta http://groups.google.com/group/J-Programming Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari einfaldleikans góður kennari getur stigið á tær án þess að glansinn fari af skónum /|_ .-----------------------------------. ,' .\ / | Með léttri lund verður | ,--' _,' | Dagurinn í dag | / / | Enn betri en gærdagurinn | ( -. | `-----------------------------------' | ) | (\_ _/) (`-. '--.) (='.'=) `. )----' (")_(")
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