I2C Expansion Board

[Artyom]

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As I undestand you switch on pull up resistors? You using pullup register to do that?

Thanks Artyom !

Pullup resistors (internal or external) have the same purpose of holding (either weak or strong) an input GPIO  at logic level 'high' or '1'.   To signal the input, then all the device has to do is provide a 'ground shot'; pulling the input pin low for some period of time.  

Input switches are often used this way. The internal pullup is cool, because it requires less external circuit components. 

marcus
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