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Beginning Arduino Programming by Brian Evans

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Arduino I/O Demystified

The Arduino interface board has a single row of connectors or pins on each side of the board. These are used mostly for inputs, outputs, and power. Figure 5-1 shows a simple illustration of the Arduino Uno interface board. Your board might be a little different.

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Figure 5-1. Arduino illustration

As shown in Figure 5-1 and printed on the interface board, there are 14 pins on one side of the board marked Digital that are numbered from 0 to 13. Of these, two are used for serial communications through USB for programming, debugging, and other forms of communication. These pins are numbered 0 and 1, and are marked RX <- and ...

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