Lego nxt ultrasonic sensor - Any success?

Hi I have been trying to get a lego nxt ultrasonic sensor (rangefinder) to work with arduino, but have yet been unsuccessfull. The US communicate with i2c, but it seems to not want to react to the commands i try to send to it with wire. I have tried many many combinations, allso bitshifted. But I have not been able to desichper what exactly it needs.

I can make my arduino work as a slave i2c-device connected to the nxt-brick and read out what it is sending.

But I fear, that somehow wire sends out "stuff" that the US does not like.

Have anyone successfully done this?

Best regards Christian Liljedahl