@robert-hh said in ADC sensors on external PSU: @Alephus Connecting the sensor to the input should not raise the voltage measure at that connection. So it must be something else in the set-up. after a while i did a few more tests and found something: of all ADC1 pins, all behave properly except P19 and P20 (guess wich 2 i was using) a friend analized my problem as well and detected that those 2 pins where not "floating", and after analazing the datasheet he assumes its because they are the only ones with pullup/pulldown internal resistors. So for now i have a solution however i still dont understand is why, after all, they are tecnicaly valid Pins pins in the datasheet

@robert-hh I just connected power drectly. That works, now I have to do some soldering in order to check if it works together with the level-shifter. Thx so far!