Hi there, I actually like your venture and I feel I have techniques to assist you. Your software is submitted. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be employed to energy externally the WCH CH569 MCU (it is suggested to remove the P4/SHUNT in that situation It's not necessarily mandatory since the 3V3 LDO IC1 is shielded against rev