Very practical when you need to use an external power source and connect it directly to your board. You can use this pin to provide 7-12V to your board. Now, if you look at the power pins on the circuit, you’ll see a Vin pin. So, you’ve already got 2 ways to power your Arduino Uno board. It’s great for communication between your board and your computer (or other Arduino boards), but might be not enough to power some real motors. The power coming from the USB cable is lower. If you are using some hobby servomotors powered by your Arduino, you might want to use the DC power jack. You can also use the DC power jack to power your Arduino board with 7-12V. The first one is simply to connect your Arduino board to your computer using a USB cable – usually you get one when you order an Arduino board.
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