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Ask an Expert Forum How to wire FX292X-100A-0100-L compact compressive load cell?
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How to wire FX292X-100A-0100-L compact compressive load cell?

Trensicourt
Trensicourt over 3 years ago

I am using this FX292X-100A-0100-L compact compressive load cell; however, I am not sure how to wire the analog mv/V version of it. I am not quite sure where the O- and O+ wires go on the datasheet. For context, I am trying to wire to a Teensy 4.1 microcontroller.

I have a follow up question. My goal is to read ground reaction forces by putting these on a foot plate. I'm not sure how to get the sensor to contact the ground in a protrusion. I was thinking of applying a very strong adhesive to the sensor and attach a protruding T plate to measure ground reaction forces. I'm not sure if this is a feasible solution sense the contact zone for the area is so small; it could possibly easily fall apart regardless of the strength of the adhesive. Are there any other recommendations for how to do this?

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  • dougw
    dougw over 3 years ago +1
    If you connect V- to ground and V+ to 5 volts, both O+ and O- will be at approximately 2.5 volts. The voltage difference between O+ and O- will go between 0 volts at zero load to 0.1 volts at 500 Newtons…
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  • dougw
    0 dougw over 3 years ago

    If you connect V- to ground and V+ to 5 volts, both O+ and O- will be at approximately 2.5 volts. The voltage difference between O+ and O- will go between 0 volts at zero load to 0.1 volts at 500 Newtons (its full scale). Having a signal at 2.5 volts that only changes by 0.1 volts is tough for a microcontroller A-to-D so normally you would use a differential amplifier to amplify this signal before feeding it into an A-to-D converter.

    You can see how I did a similar application here:

    /challenges-projects/design-challenges/sixth-sense-design-challenge/b/blog/posts/sixth-sense---sensor-circuits---graffitibot-blog-3

    Applying 500 Newtons to a small device like this usually requires a stiff plate on either side, perhaps with a hinge between the plates to constrain them to only move in one direction.

    You can see the hinged load tray I designed for the load cell here::

    /challenges-projects/design-challenges/sixth-sense-design-challenge/b/blog/posts/sixth-sense-mechanical-design---graffitibot-blog-15

    Other blogs for this project provide other relevant info.

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  • Trensicourt
    0 Trensicourt over 3 years ago in reply to dougw

    I have spare HX711 amplifiers. From what I understand to amplify these, would you attach V+ to E+, V- to E-, O+ to A+, and O- to A-? Or would the HX711 itself be an inappropriate tool to use here?

    Do you mean 0 volts at zero to 2.5 volts at 500N; where each 20mV is about 20N?

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  • Trensicourt
    0 Trensicourt over 3 years ago in reply to dougw

    I have spare HX711 amplifiers. From what I understand to amplify these, would you attach V+ to E+, V- to E-, O+ to A+, and O- to A-? Or would the HX711 itself be an inappropriate tool to use here?

    Do you mean 0 volts at zero to 2.5 volts at 500N; where each 20mV is about 20N?

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  • dougw
    0 dougw over 3 years ago in reply to Trensicourt

    The HX711 is appropriate - there is a guide to the HX711 here:

    https://learn.sparkfun.com/tutorials/load-cell-amplifier-hx711-breakout-hookup-guide?_ga=2.54789995.1789137181.1645342616-107432597.1645342616

    In a strain bridge load cell the output voltages never go near the rails, they stay within 20mV of the mid point voltage between the rails.

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