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ros sick lms parameters help please

asked 2012-02-20 04:00:30 -0600

liquidmonkey gravatar image

updated 2012-02-20 07:49:08 -0600

kwc gravatar image

i have a SICK LMS 200 hooked up and am using ROS with the sicktoolbox and sicktoolbox_wrapper.

my question relates to the parameters found on this page...http://ros.org/wiki/sicktoolbox_wrapper#Nodes

i have tried changing parameters such as angle (to 10 for example) or resolution but the readouts shown by rostopic echo /scan always give me a large amount of read outs.

is it not possible to change the parameters to get, for example, only 10 values at a specified angle range?

i can understand that the actual mechanics inside the laser might not allow this but then why are these parameters offered? is it not possible to change them at all? the baud is able to be changed but what about Hz?

and when changing the parameters i have tried both these methods with no success: rosparam set sicklms/angle 5 OR rosrun sicktoolbox_wrapper sicklms _port:= /dev/ttyUSB0 _baud:= 500000 _angle:= 10 _resolution:= 1

thanks for any tips!

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answered 2012-02-20 07:39:12 -0600

Eric Perko gravatar image

Angle and resolution are forwarded to the underlying driver. Some SICK scanners have different angles or resolutions that they can scan in. For example, some may have a 180 degree field of view with 1 degree angular resolution and a 90 degree field of view with a 0.25 degree angular resolution. Those parameters allow the driver to reconfigure the scanner into one of its supported modes.

Note that these have to be a supported mode - you can't just pick a 10 degree field of view unless the scanner itself supports such a mode.

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thanks for the answer. tech specs of the LMS200-30106 (that we use) show the actual device does support 0.25, 0.5 and 1 degree of resolution. 0.25 res will limit the scan angle to 100 degrees though. so my question is really if the ros lms drivers found in sicktoolbox (and wrapper) are supported?

liquidmonkey gravatar image liquidmonkey  ( 2012-02-21 00:08:54 -0600 )edit

I'm honestly not certain if it's supported. Try it with an angle of 100 degrees and a resolution of 0.25 degrees and what sort of scans you get, i.e. make sure that the sensor_msgs/LaserScan parameters match your config and that you have ~400 measurements and that they look good in RVIZ.

Eric Perko gravatar image Eric Perko  ( 2012-02-21 04:32:42 -0600 )edit
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Asked: 2012-02-20 04:00:30 -0600

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Last updated: Feb 20 '12

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