[Hans Peter] wanted to move away from using full Arduino ... edge connector for the USB instead of using a mini-B jack. It’s pretty impressive to see his prototyping work with the 16-pin QFN ...
All Arduino boards have this pin, and it's connected to the ... You might not have a compatible cable to use this supply with ...
The USB “connector” assumes that pin 2 is ground ... The code is simple. Just like the Arduino has a lot of helper library routines, mbed provides most of what you need to drive the devices ...