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I was running the first code given here yesterday, i am using python 2.7 and raspberry pi model B 512MB RAM, raspbian OS HMC5883L with compass when i execute the code above i get an I/O error at lines 27 and 29 can you please help me fix this? And is something wrong with my PI or Compass are they Ok?

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Yes i got it right, i should change
bus = smbus.SMBus(0) to bus = smbus.SMBus(1)
since i am using rev2 512 MB board.

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