My question is simple - maybe silly. I've got 2 circuits:
Do I need to connect two separate grounds (MCU ground and dummy load ground) into common ground?
I think yes, still not certain about it - i don't know the impact on the accuracy of the measurements taken by ADC.
If no, where should I ground the R's and D's - to the MCU ground or dummy load ground? If you have any remarks on this circuit feel free to criticise me.