Which digital pins can be used in Arduino Nano/Uno to provide an interrupt?

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Which digital pins can be used in Arduino Nano/Uno to provide an interrupt?

The important idea is about hardware external interrupts. On Arduino Uno/Nano (with the ATmega328P), there are two external interrupt lines, INT0 and INT1, which are mapped to digital pins 2 and 3. These pins can be configured to trigger on rising edges, falling edges, or changes, providing a fast, deterministic way for the microcontroller to respond to external events. Other pins don’t have these dedicated external interrupt lines (though some can use pin-change interrupts, they’re a different mechanism and more complex to handle). So the pins you’d use for a straightforward external interrupt on these boards are D2 and D3.

The important idea is about hardware external interrupts. On Arduino Uno/Nano (with the ATmega328P), there are two external interrupt lines, INT0 and INT1, which are mapped to digital pins 2 and 3. These pins can be configured to trigger on rising edges, falling edges, or changes, providing a fast, deterministic way for the microcontroller to respond to external events. Other pins don’t have these dedicated external interrupt lines (though some can use pin-change interrupts, they’re a different mechanism and more complex to handle). So the pins you’d use for a straightforward external interrupt on these boards are D2 and D3.

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