The easiest way to power your Arduino is via the USB port, as it provides power and communications for uploading programs and using the serial port. As we mentioned before, you can power the Arduino using the 2.1mm centre positive barrel jack which accepts 9-12V DC, however you'd also need a USB connection to communicate to the computer.

There is also a V-in pin on the Arduino UNO power header, which allows you to bypass the 5V regulator and give it 5V directly, however this is only recommended for advanced designs due to the lack of protection in the event of a voltage spike or incorrect power supply.

We recommend using the USB port for powering and programming your Arduino IDE, especially whilst prototyping as it is the safest and most reliable method. Now let's get your first program onto your Arduino board!