You are reading a single comment by @fobus and its replies.
Click here to read the full conversation.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fobus
Orange and gren comes direct from 5V adapter. And STM32F4 Board gets the power from USB. You are right they don't share the same GND. So, Board and PIC uses different power sources.