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There is no ground loop in your question since there are no current shown to cause noise. So we can assume this is induced line noise. Common Design error. Mismatched source and Return impedances. The whole point of using an INA is to use the differential inputs and have balanced impedances from source to output. INA Impedance, Differential \$10^{12}~Ω /...


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I'm not entirely sure, but I think your 24V somehow ended up in the Arduino. I would place the 24V rail and the 5V rail on opposite sides, that's why your breadboard should have one rail on each side. Sometimes they even come with 4 rails, indicated with a small gap in the lines on the side rails. Technical schematics often use + and minus opposite to the ...


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AGND and GND are generally "Analog Ground" and "Everything Else Ground" The general reason they are separated is that AGND is the reference to sensitive analog circuits (amplifiers, ADCs, DACs, etc...) and GND is the reference for general digital circuits (gates, shift registers, MCUs, CPUs, FPGAs, etc...), which can impart a lot of switching noise onto ...


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