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I am looking to measure the force applied (in this case by a foot to a pedal).

I have a working prototype that allows up to 450N of force, but wish to double this.

The load cell I have been using is available in a 900N rating however there is no stock of this nor is it likely to be available any time soon. The output of the loadcell is as a value transmitted in the I2C protocol

As a late night brainwave purchase I bought a second identical load cell, with the thought process that if I divided the load between both and then summed the values I would have the force applied, while increasing the load measuring capacity to the desired range.

I am however getting myself very confused over whether I am just measuring the same force twice.

My current plan / arrangement is to have the load cells at the end of a rod, all held within a tube, so:

Fixed end -- load cell -- rod -- load cell -- pedal

While the basic physics is current, my brain is getting older and would like a bit of help working this out (other than through experiment) before I start machining metal. Its over 20 years since I needed to consider anything like this.

Thanks in advance

1 Answers1

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"Fixed end -- load cell -- rod -- load cell -- pedal"

You are indeed measuring the same force twice. You need to build a little mechanism that shares the force between the two load cells, basically a seesaw.

load cell seesaw

Or for half the cost just use a 2:1 lever

lever

Greg Locock
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