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Arduino Internals by Dale Wheat

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What Is an Arduino?

Because of Arduino’s history and evolution, there are many variations on what can be called an Arduino. The list grows longer every day. The official offering from the Arduino Team consists of the Arduino Uno and the larger Arduino Mega 2560.

When most people think of Arduino, they imagine the small, rectangular (and probably blue) printed circuit board (PCB). This is properly called the I/O Board. See Figure 1-1.

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Figure 1-1. The Arduino I/O Board. This is what most people think of when you say “Arduino,” even though it’s only one piece of a larger system.

The I/O Board is the physically tangible part of the Arduino system. ...

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