Lightware LW20 - How to get last return?

Hi All,

I have a new LW20 installed on my agricultural survey rig and it had its first flight test today. It is working very nicely, following terrain over some particularily slopey fields however I can’t seem to find the last return values within the log.

I am running arducopter 3.5.5, the LW20 is on the I2C (configured as per what is listed in the ardupilot setup info here http://ardupilot.org/copter/docs/common-lightware-lw20-lidar.html).

I can see the RFND data within the log and I have good altitude values for Dist1, but Dist2 is all 0’s (Orient 1 is all 25’s and Orient 2 is all 0’s … not quite sure what these values mean). I was hoping to see Dist 2 being the last return so is there something else that needs to be configured (perhaps on the LW20 itself) or should I be logging another variable?

Thanks,

S.

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