Thanks for your reply! yes I was talking about the ADS1115 .though I am really sorry this bit "Instead of using 5V as the reference, you should consider using a 4.096V reference. That way, the max output voltage lines up with a positive full scale range of the ADC. You'll be able to maximize the resolution of the measurement." Confused me a little, does it mean to use 4.096V as VDD?
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