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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
I think I'm still doing some thing wrong. Now I'm using a 5V source for both STM32F4 and PIC, but still getting random characters. I'm going to try a debugger to see what's happening inside of the pic and write the results here.
Thanks for your helps.