weight sensor

Discussion in '8bit Microcontrollers' started by jim shirreffs, May 18, 2008.

  1. Does anyone know where I can get an low cost weight sensor? I have looked
    and looked and looked but can't find one anywhere. I know they exist since I
    can buy a digital bathroom scale for under $20 usa and the bathroom scale
    has 4 sensors (strain gages) built into it. Unfortunately a strain gage
    requires some kind of signal amplification that is beyond my limited
    abilities to assemble.




    What I would like to find is a component that has the strain gage and the
    signal amplification all build into it. The load would be in the 20 - 90 lbs
    range.



    thanks in advance to any and all that reply.
     
    jim shirreffs, May 18, 2008
    #1
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  2. "TT_Man" <> wrote in message
    news:C%%Xj.12867$2...
    >
    > "jim shirreffs" <> wrote in message
    > news:g_ZXj.2577$HJ5.142@trnddc01...
    >> Does anyone know where I can get an low cost weight sensor? I have looked
    >> and looked and looked but can't find one anywhere. I know they exist
    >> since I can buy a digital bathroom scale for under $20 usa and the
    >> bathroom scale has 4 sensors (strain gages) built into it. Unfortunately
    >> a strain gage requires some kind of signal amplification that is beyond
    >> my limited abilities to assemble.
    >>
    >> What I would like to find is a component that has the strain gage and the
    >> signal amplification all build into it. The load would be in the 20 - 90
    >> lbs range.
    >>
    >>
    >> thanks in advance to any and all that reply.
    >>
    >>

    > Digital fishing scales? To make a 1 off is gonna cost loads . When you
    > make 100K off bathroom scales, the cost heads towards zero, like all
    > electronics.
    > Do you want a one off, or something you can put into production? For a one
    > off, rip apart the fishing scales....
    >

    Thanks for taking the time to reply. I want to prototype an idea I have and
    if the idea truns out to be a good one then perhaps go into low volume
    production. My problem is that I am a computer programmer not an electrical
    engineer. So I am trying to find low cost components that I can assemble on
    a bread board for a prototype.

    I did find this at
    http://www.alibaba.com/product-gs/2...acelog=detailtop12907&newId=205545910#page960

    Model CZL902
    ===========
    Rated load: 50KG
    rated output: 1.0+-0.15MV/V
    dimensions: 34*34*7.8(mm)
    Cable spec: 0.8*420mm

    To my simple non-ee mind it looks like this might be useable out of the box.
    I am hoping to find one I that I can just read the voltage and then compute
    the weight.

    jim
     
    jim shirreffs, May 26, 2008
    #2
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