Hi, I actually like your undertaking and I do think I have competencies that can assist you. Your software is submitted. 1x GND 3V3 (P2 with 2 pins 2.54mm) connector can be employed to energy externally the WCH CH569 MCU (it is suggested to eliminate the P4/SHUNT in that situation https://barryp172ypg9.homewikia.com/user