wire without enabling pull up resistors?

Forum 2005-2010 (read only) Software Bugs & Suggestions
6

Hello.

I'm using a DS1307 I2C RTC and external 2k2 pull-up resistors like shown in this page:

http://www.glacialwanderer.com/hobbyrobotics/?p=12

Are these external resistors required?
Is Arduino using internal pull-up resistors?

Thanks