I have a project where I'd need to measure small voltage (0.05 mV) output of a wheatstone bridge with an arduino mini pro.

Based on my previous question most probably it can't be done with its analogue input directly. what is the range of the measurable relative elasticity with a commonly used strain gauge

The question is that can a hx711 module measure so small voltages? Based on the calculation in the question it has the resolution of 3 uV from 0 to 5V excitation voltage.

How can estimate that what resolution I can expect in practice?

  • $\begingroup$ This is a physical design for EMI crosstalk issue and depends on your ability to control impedances low, balance and shield wires. This might require Coax to your source and careful grounding at a minimum $\endgroup$ Dec 20, 2019 at 20:18
  • $\begingroup$ Are you asking about measuring voltages with just an ADC, or with an ADC plus signal conditioning and amplification? $\endgroup$
    – TimWescott
    Dec 20, 2019 at 21:46
  • $\begingroup$ With an ADC plus signal conditioning and amplification. Basically with what that hx711 or similar a module (in price) offers. $\endgroup$
    – Hegedus.Cs
    Dec 20, 2019 at 23:41
  • $\begingroup$ What is the price of hx711? $\endgroup$ Dec 24, 2019 at 14:05
  • $\begingroup$ Around 0.3 - 1 dollars each depending on volume and supplier (Chinese or EU). $\endgroup$
    – Hegedus.Cs
    Dec 24, 2019 at 15:18


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