Hello, I actually like your project and I believe I've capabilities to help you. Your software has been submitted. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be used to electrical power externally the WCH CH569 MCU (it is usually recommended to remove the P4/SHUNT in that scenario It is far from necessary as being the 3V3 LDO IC1 is shie