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I am brainstorming on how to do relatively accurate weighing scale for fish on a boat under different seastate conditions.

I know other companies use a second load cell together with calibration data and some heavy math to do the same with sucess. The issue with this is that it takes some time to compute the sample data to estimate the G-force used to compute the weight.

To me the obvious choice would be to get a 9-axis IMU together with a loadcell to counter the G-forces to get accurate measurements. If the IMU delivers an accurate G-force I would not have to consider the above solution.

  • What accuracy can I expect from a high grade 9 axis IMU?
  • Is a good IMU the way to go about solving this problem?

My budget is around 2000USD per item.

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    \$\begingroup\$ @DKNguyen I think the question is about weighing some object onboard the boat, rather than the boat itself. The problem being that the movement of the weighing system due to the movement of the boat means that you can't directly translate force on the load cell to actual mass. \$\endgroup\$
    – user1937198
    Commented Feb 15, 2021 at 15:01
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    \$\begingroup\$ Measurement time and filtering are also variables \$\endgroup\$
    – D.A.S.
    Commented Feb 15, 2021 at 15:05
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    \$\begingroup\$ @DKNguyen Actually weighing the boat might be an easier problem, as you can get a pretty good estimation from how deep in the water the boat is. \$\endgroup\$
    – user1937198
    Commented Feb 15, 2021 at 15:05
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    \$\begingroup\$ Oh, I think you may be correct Yeah I was thinking why wouldn't you just use the water line? Can you just not use two matched load cells where one has a known proof mass attached to it? \$\endgroup\$
    – DKNguyen
    Commented Feb 15, 2021 at 15:16
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    \$\begingroup\$ If that is the traditional method OP is describing that takes a long time I don't see why it would be computation heavy. Wouldn't it just be a scaling multiplication? My guess is the time is not due to computation but getting a stable reading on the load cell. That said, it's actually not clear in my mind why it would take a long time to get a stable reading though since you have a proof mass and an instant reading for it at that moment. \$\endgroup\$
    – DKNguyen
    Commented Feb 15, 2021 at 15:23

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