From: Dave H. <dhy...@gm...> - 2010-07-07 17:23:19
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Hi Emily, On Wed, Jul 7, 2010 at 10:08 AM, emmers369 <emm...@ya...> wrote: > > Hi Dave, > I used the SCL and SDA lines from the Pinto as well as the 3.3V and 1.8V > power pins. I used the 3.3V pins to power the sensors and the 1.8V to power > the I2C communication. I did the same thing on the other board and it worked > fine, I would think I was negating those pull up resistors by doing it this > way. I2c relies on the pullup resistors. The SDA and SCL signals are only capable of driving a signal low, they can't drive the signal back high again. That's the purpose of the pullup resistors. -- Dave Hylands Shuswap, BC, Canada http://www.DaveHylands.com/ |