How would you measure an external voltage with the arduino ADC (eg ups battery, or another supervised PSU) and at the same time maintaining ground isolation between the two systems? I thought of using an external ADC and then optoisolate on the digital side, however the ADC then needs to be powered…

Measuring voltage with arduino ADC without connecting grounds

allanhurst February 22, 2018, 10:59pm 14

Hi,
What is wrong with switched capacitor method?

Tom...

Nothing - there are a hundred ways to skin this cat

Allan

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