Hi all. Complete newbee. little electronics experience. programmer. new Arduino Mega on its way to me. I understand the logic of a pull up or pull down resistor, and what happens if I don't use one. Have browed the 20 pages of topics under the 'General Electronics' forum, but can't seem to find t…

Pull up or down ?

Grumpy_Mike April 6, 2011, 2:45pm 15

would require external pull-up resistors connected to 3.3V

Yes and a hack to the I2C library to not enable the internal pullups.

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