Have you got 2x pullup resistors on each I2C line? Also, it's possible that you have the address in 8 bit format (in which case you'll have to shift 0x68 right by one bit).
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Have you got 2x pullup resistors on each I2C line? Also, it's possible that you have the address in 8 bit format (in which case you'll have to shift 0x68 right by one bit).