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2021-07-26 at 12:20 PM #15723
With such a small max signal of 200 mV, you’d definitely want to use the ADS1115. The default ADC range has a resolution of 0.1875 mV/bit, which is pretty coarse so you’d want to use a higher gain setting like 8 or 16. At gain 16, there’s a max input of 256 mV, and a resolution of 0.0078125 mV/bit. Just be sure the ADC input doesn’t see anything more than 256 mV or you risk damaging the ADS1115. Gain 8 might be safer and still has plenty of resolution.