Isolate monitor domain from USB
In order to use monitor card in serial power setup need to isolate the 5V domain powering the ADC and LDO from the USB domain.
Could use something like this: https://www.cui.com/product/resource/pes1-m.pdf And this for i2c: https://www.digikey.com/product-detail/en/texas-instruments/ISO1541DR/296-34872-1-ND/3587215