Turtlebot not appearing on RViz during mapping

asked 2011-11-06 21:47:32 -0500

apalomer
318 ●51 ●54 ●66

updated 2015-07-14 09:42:03 -0500

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Hi,

I'm trying to follow this tutorial to build a map with the turtlebot. The thing is that I can not see anything on the rviz. If I look at the topics on the left column I see that it has two problems: Pose Array and Path. Both have the same problem: No message received. When I have a look at the diagnostics on turtlebot dashboard I get this message:

name: /slam_gmapping msg: Transform from base_link to odom failed

file: /tmp/buildd/ros-diamondback-slam-gmapping-1.2.3/debian/ros-diamondback-slam-gmapping/opt/ros/diamondback/stacks/slam_gmapping/gmapping/src/slam_gmapping.cpp function: laserCallback line: 496 topics[] topics[0]: /rosout topics[1]: /tf topics[2]: /slam_gmapping/entropy topics[3]: /map topics[4]: /map_metadata

My turtlebot doesn't have a gyro. Can this be the problem?

Thanks

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answered 2011-11-09 18:07:04 -0500

Atom
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From my experience Gmapping without the gyro will give the same results as you mentioned. Turtlebot doesn't move around the map. I believe this is due to the fact it obviously needs the gyro data to localize it self properly . I assume you could use RXGraph to find where the missing data link in gmapping is and possibly write your own code to create data to determine your robots location but, if I were you I would just invest in the recommended gyro.

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answered 2011-11-10 22:43:29 -0500

MichiReip
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checkout http://www.ros.org/wiki/roomba_500_series. You will find a roomba560_node.cpp. For mapping you have to add a joint state publisher, just like turtlebot_node does.

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answered 2011-11-08 22:03:24 -0500

apalomer
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I've solved part of the problem and I only get the first half of what I posted. It only happends that nobody is publishing at the topics Pose Array and Path. I set the gyro as false, because I don't have one, useing: rosparam set turtlebot_node/has_gyro false

What are this topics which I have the problem? I realised that when I run rviz the robot doesn't move arround the enviroment as it's suposed to do. What I mean is tat when I try to create a new map the robot only tourns and prints the map all at the same point so at the end I get a mess not a map. I think this has to do with one of the topics which is suposed to "know" where the turtlebot is.

What would you recomend me to cheeck to see why is nobody publishing?

Thanks

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answered 2011-11-15 01:09:03 -0500

apalomer
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Problem almost solve, I've changed the odometry in turtlebot_node.py for the one in roomba560.cpp and it's working quite well. Now it only needs a little bit of calibration...

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answered 2011-11-10 21:43:29 -0500

apalomer
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I've solved the problems. The two topics are not supposed to be published while mapping, they're only for the autonomous navigation. The other thing is that I'm still not able to create maps, that's because of the odometry calculated on turtlebot_node.py is not correct for the roomba564. We're working on a new odometry for that model of robot, and hopefully when the new odometry works the mappgin will also work.

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answered 2012-02-24 01:29:22 -0500

osuairt

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Hi,

I get the same transform problem and I have been scratching my head for some time to find out why. I have a gyro, it is present on the turtlebot_dashboard etc. I don't have a roomba base like in your case, I have the actual Create base.

It remains a mystery.

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Have you tried using rxgraph to look for any broken links? Are you sure your gyro is fully functional and installed correctly? Are you receiving any data from the gyro ?

Atom ( 2012-02-25 18:27:29 -0500 )edit

Dashboard says so, also when running minimal.launch it specifies measurement rate of 150. It is all there. I'm getting a lot of skipping, http://imgur.com/3NJZ0 . http://imgur.com/nsQ9X graph is complete. I've swapped out the Create base with another and still get the problem.

osuairt ( 2012-02-27 04:11:53 -0500 )edit

Looking back at some of your other posts I noticed you were using a Samsung NC110. I think this netbook might not be enough power to run gmapping along with rviz together. Are you running gmapping and rviz on this one machine? Your cpu might be lagging and causing some problems.

Atom ( 2012-02-27 19:20:43 -0500 )edit

Hi, Rviz is running on a workstation like it should. Point cloud throttling is set to 10.0 and I get a load average of 0.8 to 1.5 on the netbook, it is a dual core Atom N570, meaning no system overload.

osuairt ( 2012-02-27 22:06:15 -0500 )edit

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answered 2011-11-11 00:27:38 -0500

apalomer
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MichiReip, I have this package and I know it's working. but I can not work with both at the same time. They can't read both from the same USB port. that's why we want to change the odometry on the turtlebot_node.py for the one on the roomba560.cpp

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