An USB isolator aids get rid of floor loops and cuts down electromagnetic interference (EMI) amongst the computer plus the linked system. 1x GND 3V3 (P2 with 2 pins 2.54mm) connector can be employed to electric power externally the WCH CH569 MCU (it is suggested to remove the P4/SHUNT in https://dietriche738nji1.empirewiki.com/user