Howdy, I actually like your undertaking and I do think I have competencies that can assist you. Your software continues to be submitted.1x GND 3V3 (P2 with two pins 2.54mm) connector may be used to power externally the WCH CH569 MCU (it is suggested to eliminate the P4/SHUNT in that case It's not at all required because the 3V3 LDO IC1 is safeguard