Some Arduino projects may need more than two power supplies, to power both the Arduino and connected parts such as servos. When fed with 4.5-35V, this Arduino power shield is able to provide 1.25-12V with 3A peak current!
It's ideal for servo control and other non-standard components. With this Arduino power supply shield, your Arduino now has one power supply for everything!
The board has a built-in voltage measuring function which maps the output voltage to Arduino analogue pin 0. It can also be controlled by the Arduino's digital Pin13 to switch on/off.