An USB isolator will help eliminate ground loops and lessens electromagnetic interference (EMI) in between the pc and the linked product. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be utilized to electric power externally the WCH CH569 MCU (it is recommended to get rid of the P4/SHUNT https://lukasrkctk.lotrlegendswiki.com/1278789/5_tips_about_hydrabus_you_can_use_today