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November 3, 2012
about 2 years ago
I want to confirm what some other comments have said. I am using my MSP430G2553 launchpad, Energia and the Basic Example from Sparkfun at 3.3V.
The 10K pull ups are too large. I connected the SCL and SDA lines to an oscilloscope and they are rounded off horribly. It explains why my plotted data from the chip is incredibly “noisy.”
4.7kΩ pull ups work great though. The SCL and SDA aren’t exactly square, but are less rounded and the plotted data is clean.
Sparkfun, as other have suggested from years ago, please sell off the stock you have and revise these boards to R1=R2=10kΩ.
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