The junction on the voltage divider network connected to the the Arduino analog pin is equivalent to the input voltage divided by 11, so 55V ÷ 11 = 5V. In other words, when measuring 55V, the Arduino ...

In the case of the Arduino Nano, a mini-B USB cable is required. The power source, on the other hand, can be a powerbank, a phone charger, or even your computer — anything that generates 5V and ...

The 5.2V is safe for all 5V-powered electronics like Arduino, Raspberry Pi, or Beagle Bone while preventing icky brown-outs during high current draw because of USB cable resistance.

There is a level shifter so a 5v (Arduino UNO, etc) or a 3.3v (Arduino Zero, Raspberry Pi, etc.) micro controller can be used. Both can work simultaneously.