How many digital pins are available on the Arduino UNO board?

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Multiple Choice

How many digital pins are available on the Arduino UNO board?

Digital pins on the Arduino UNO are the general-purpose inputs and outputs you control with digitalRead and digitalWrite. The board exposes fourteen of these pins, numbered 0 through 13. Two of them (the ones labeled D0 and D1) are tied to the USB-to-serial interface and serve as the hardware serial port (RX and TX), so when USB communication is in use you typically treat them as serial pins rather than generic I/O. The analog inputs A0–A5 can also function as digital pins if needed, but they are normally used for analog readings and are labeled A0–A5, not counted among the digital pins. Plus, six of the digital pins support PWM output on D3, D5, D6, D9, D10, and D11. So there are fourteen digital pins in total.

Digital pins on the Arduino UNO are the general-purpose inputs and outputs you control with digitalRead and digitalWrite. The board exposes fourteen of these pins, numbered 0 through 13. Two of them (the ones labeled D0 and D1) are tied to the USB-to-serial interface and serve as the hardware serial port (RX and TX), so when USB communication is in use you typically treat them as serial pins rather than generic I/O. The analog inputs A0–A5 can also function as digital pins if needed, but they are normally used for analog readings and are labeled A0–A5, not counted among the digital pins. Plus, six of the digital pins support PWM output on D3, D5, D6, D9, D10, and D11. So there are fourteen digital pins in total.

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