课程: Learning Arduino: Foundations

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The power pins

The power pins - Arduino教程

课程: Learning Arduino: Foundations

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The power pins

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- [Instructor] These are the power pins. They're usually located in the left side of the Arduino board. The first one is a Voltage In. Vin, and sometimes labeled 9 Volts, use this input voltage when using an external power source, as opposed to the 5 Volts from the USB connection. An example is when providing a voltage from external source, like a solar panel. Note that different boards accept different input voltages. So always check the documentation. The 5 Volts, this pin outputs a regulated 5 Volts from the regulator on the board to provide a voltage to your circuit. We'll use this pin in our examples later in the course. 3V3, provides an output of 3.3V. And finally, the ground pins. So when we build the circuit, it's important to have a common ground with Arduino, and here where we connect it.

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