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Added "To disable the internal pull-ups:" because the above quote quote from the datasheet talks about enabling.

edit approved Jul 16, 2018 at 1:24

From the datasheet:

Note that the internal pull-ups in the AVR pads can be enabled by setting the PORT bits corresponding to the SCL and SDA pins, as explained in the I/O Port section.

To disable the internal pull-ups:

digitalWrite(A4, LOW);
digitalWrite(A5, LOW);

digitalWrite(2, LOW);
digitalWrite(3, LOW);

From the datasheet:

Note that the internal pull-ups in the AVR pads can be enabled by setting the PORT bits corresponding to the SCL and SDA pins, as explained in the I/O Port section.

digitalWrite(A4, LOW);
digitalWrite(A5, LOW);

digitalWrite(2, LOW);
digitalWrite(3, LOW);

From the datasheet:

Note that the internal pull-ups in the AVR pads can be enabled by setting the PORT bits corresponding to the SCL and SDA pins, as explained in the I/O Port section.

To disable the internal pull-ups:

digitalWrite(A4, LOW);
digitalWrite(A5, LOW);

digitalWrite(2, LOW);
digitalWrite(3, LOW);

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answered Jul 14, 2015 at 20:48

Ignacio Vazquez-Abrams

answered Jul 14, 2015 at 20:48

Ignacio Vazquez-Abrams

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From the datasheet:

Note that the internal pull-ups in the AVR pads can be enabled by setting the PORT bits corresponding to the SCL and SDA pins, as explained in the I/O Port section.

digitalWrite(A4, LOW);
digitalWrite(A5, LOW);

digitalWrite(2, LOW);
digitalWrite(3, LOW);

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