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A strain gauge measures the physical strain on an object. The most common types are a metallic foil attached to a flexible backing where the resistances changes when subjected to compression or tension.
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Wheatstone bridge sensitivity and accuracy
First of all, you want to connect Vref of the inamp to the same lower voltage reference that you are using for the ADC (in case you haven't done that already). As for the strange behavior of the strai …