felixwatzlawik's profile - activity

Hello there,

I am trying to do hector mapping with two sick s300.

They're back to back and with this I have 360° of sight.. so I want to use both laser/scan topics for hector.

How can I tell hector to use two topics?

I already tried the following:

• two Hector Mapping Nodes -> Result: I have two Maps which are jumping

• one Hector Mapping Node and two Laserscanner Nodes -> Result: only using one node

• one Hector Mapping Node and two Laserscanner Nodes one remapped two the other: ->Result: Laserscan is jumping and building a kind of okay map.. but not satisfying cause he is telling me that the searchdir angle was to big (of course, he thinks I have one laserscanner and I am turning it 180° degrees)

Is there a better solution to use multiple Laserscanners for hector mapping?

pls help, greez felix

Hello!

I am working for my Bachelor Degree with ROS and I have to setup and implement a Robot System.

The final goal is to grab a mug while the robot is driving next to it.

Now my question is, since I am not so good with ros right now and I am at the beginning, what packages there exist to use Robot-Arms and which Robot-Arms are supported?

Is it possible to solve this Problem with ros?

It would be nice if anybody could answer me these questions :) greez

Hi people, I am using a differential drive robot with a sick laser scanner.

When I am driving him forwards everything is fine but when I start turning the LaserScan doesnt match with the map and it starts drifting.

I am only using AMCL and not robot_pose_ekf, do I need to use this?

Here is my current tf tree.

Here is a Screenshot when I drove forwards:

and once I am starting to turn the robot the laserscan (red boxes) dont match with the map anymore :/ I have really no idea where to look for the mistake:

Hope you can help, greeting

Is there a possiblity to send Data through UDP over a ROS Node?

To Specify my question: I have a Non-ROs Computer who provides odometry who sends through UDP the data and I want to write a ROS Node which listens to this data.

Also I want to build a ROS Node who sends data through ethernet to the non-ros computer!

thanks in advance

Hi guys,

I accidentally deleted my plattform but could save my workspace somehow. Now i set up a new Ros Indigo with Ubuntu 14.04 same stuff as before. I copied my data in my new workspace and sourced the setup.bash.

Now I am trying to "make" again the nodes to be usable on the new system but when I am doing make it says:

moviplc@moviplc:~$ source ~/indigo_ws/setup.bash 
moviplc@moviplc:~$ roscd twist_to_odom/


moviplc@moviplc:~/indigo_ws/sandbox/roche_control/twist_to_odom$ make
mkdir -p bin
cd build && cmake -Wdev -DCMAKE_TOOLCHAIN_FILE=/opt/ros/indigo/share/ros/core/rosbuild/rostoolchain.cmake  ..
[rosbuild] Building package twist_to_odom
Failed to invoke /opt/ros/indigo/bin/rospack deps-manifests twist_to_odom
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/rosdep2/rospack.py", line 58, in init_rospack_interface
    lookup = _get_default_RosdepLookup(Options())
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 127, in _get_default_RosdepLookup
    verbose=options.verbose)
  File "/usr/lib/python2.7/dist-packages/rosdep2/sources_list.py", line 607, in create_default
    sources = load_cached_sources_list(sources_cache_dir=sources_cache_dir, verbose=verbose)
  File "/usr/lib/python2.7/dist-packages/rosdep2/sources_list.py", line 504, in load_cached_sources_list
    with open(cache_index, 'r') as f:
IOError: [Errno 13] Permission denied: '/home/moviplc/.ros/rosdep/sources.cache/index'
[rospack] Error: could not call python function 'rosdep2.rospack.init_rospack_interface'


CMake Error at /opt/ros/indigo/share/ros/core/rosbuild/public.cmake:129 (message):


  Failed to invoke rospack to get compile flags for package 'twist_to_odom'.
  Look above for errors from rospack itself.  Aborting.  Please fix the
  broken dependency!

Call Stack (most recent call first):
  /opt/ros/indigo/share/ros/core/rosbuild/public.cmake:207 (rosbuild_invoke_rospack)
  CMakeLists.txt:12 (rosbuild_init)


-- Configuring incomplete, errors occurred!
See also "/home/moviplc/indigo_ws/sandbox/roche_control/twist_to_odom/build/CMakeFiles/CMakeOutput.log".
make: *** [all] Fehler 1

I have really no idea whats happening, he seems to have some kind of problem with rosdep? I hope anybody can help me I am really broke :(

How can I clear a map created by Hector Mapping?

or how can I restart hectormapping to create from now on a new map?

Hi, I setup my robot system and its working good.

I am using hector mapping with urdf and a laserscanner and I am getting the following result: I dont know why exactly the robot is kind of swimming in the world, here is my tf tree:

Another Question is now, how can I make the Robot move autonomously and how can I integrate a path planner? What is a common used module to make the robot move and avoid obstacles and crashes?

thanks in advance, felix

Hi guys,

I am trying to use the ira_laser_tools.

I did the following:

cd catkin ws/src
git clone https://github.com/iralabdisco/ira laser tools

Then compile the package (make sure you have PCL [4] installed):

cd ..
catkin make

and its compiling but when I am trying to run the launch file it says:

ERROR: cannot launch node of type [ira_laser_tools/laserscan_multi_merger]: can't locate node [laserscan_multi_merger] in package [ira_laser_tools]

I really want to use this package but I have no freaking idea what the problem is.

Hey there,

I got a robot running with a differential drive and a s300 laserscanner.

Its working pretty good, I can set goals and he is driving there so on.

Now I am asking myself whats next and I saw this video: http://www.willowgarage.com/blog/2011...

How can I do plans for my robot, set different places to be remember and stuff like this? What "cool" features can I use, can u give me some examples?

thanks and have a great day :)