I am facing the same issue, I have connected SRF08 on my RP6 robot, the Red light blinks for 2-3 seconds, and turns off. Meanwhile, I get the two errors of I2C ERROR--> TWI STATE IS 0x20 and 0x48. I have not connected any pullup resistors, is it necessary?? Any more suggestions to clear me on this?
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Dirk
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