Hi, I really like your task and I think I've skills that may help you. Your application has become submitted. 1x GND 3V3 (P2 with two pins two.54mm) connector can be used to electricity externally the WCH CH569 MCU (it is usually recommended to remove the P4/SHUNT in that scenario it is not necessary as being the 3V3 LDO IC1 is protected towards