According then, they are in general 10KΩ instead of a 4,7KΩ.This may cause USB connection problems. Talking about USB, You will find many sites and blogs informing Blue Pill has a wrong pull up resistor value in its ports.Pin's PA11 and PA12 are not available, once they are responsible for USB communication.Despite some pin's are 5V resilient, I suggest keep accessories level high in 3V3, other wise you can fry you Blue Pill. Like I told already, if your project need Faster Micro controller, with more GPIO (33 in total), more and/or precise ADC inputs (10 inputs x 12 Bits resolution), more analog outputs (15), more communications interfaces, etc this is the micro controller you may need.Ībove there is the pin out and schematic diagram. You may ask: 'If it looks like Arduino Nano, why I should move to a different hardware?Īnswer is simple. You may find many different manufacture, but they follow schematic very close, even the issues. This is open source hardware, looks alike Arduino Nano (almost similar size). Now a brief explanation about STM32F103 prototype board, know by 'Blue Pill'.
