BuilderMike's profile - activity

I followed the custom message documentation to the letter, and searched all the related questions on here, and unfortunately I am still stuck. Could you please have a look?

I am getting the same error building in Ubuntu 14.04 and 16.04, both running Kinetic.

All my packages that have custom messages fail to build (catkin_make exits with error). The custom message definition are part of the package, and are not from another package. The error reason is the same for all the packages with custom messages (from my limited understanding the .msg file is not found for some reason): fatal error: ... : No such file or directory ... >

The package organization follows the documentation:

where the custom message file is called my_msg.msg and is inside the msg directory. The contents of my_msg.msg are not suspect either:

int32 my_int
float64 my_float

The package.xml does contain the needed lines:

<build_depend>message_generation</build_depend>
<run_depend>message_runtime</run_depend>

The CMakeLists.txt contains everything the documentation mentions, and I even ran catkin_create_pkg test to make sure all the items are arranged in the correct order. Here is the file:

cmake_minimum_required(VERSION 2.8.3)

project(g_custom_messages)

find_package(catkin REQUIRED COMPONENTS 
    roscpp 
    rospy
    std_msgs 
    message_generation
)

add_message_files(
  FILES
  my_msg.msg
)

generate_messages(DEPENDENCIES std_msgs )

catkin_package(CATKIN_DEPENDS message_runtime)

include_directories(include ${catkin_INCLUDE_DIRS})

add_executable(custom_msg_subscriber src/custom_msg_subscriber.cpp)

target_link_libraries(custom_msg_subscriber ${catkin_LIBRARIES})

and in the source code (file name is custom_msg_subscriber.cpp and it is inside the src directory), I am refrencing the custom message as #include <g_custom_messages/my_msg.h>, and am accessing the data via:

void poseMessageReceived(const g_custom_messages::my_msg &msg) 
{
    storeInt = msg.my_int;
    storeFloat = msg.my_float;
}

All the web search gymnastics I did have not helped. Could you please let me know why am I getting an error?

I am very new to ROS and C++, and I apologize if my question is obvious.

I have looked over very many questions and answers and tried the code offered by the answers; I looked over the documentation at http://wiki.ros.org/catkin/CMakeLists... ; I moved files from /usr/local/lib to /opt/ros/indigo/lib; and I tried very many different lines of code in CMakeLists.txt and I still cannot make my code compile.

I am using Ubuntu 14.04, with Indigo and Catkin as the build tool.

The Error:

jimmy_state_publisher.cpp:(.text+0x310): undefined reference to `LJUSB_OpenDevice'
jimmy_state_publisher.cpp:(.text+0x81b): undefined reference to `LJUSB_Write'
jimmy_state_publisher.cpp:(.text+0x851): undefined reference to `LJUSB_CloseDevice'
jimmy_state_publisher.cpp:(.text+0x876): undefined reference to `LJUSB_Read'
lots more of the same type of error....

I am using a device called 'Labjack U3'. The driver for this device is called exodriver https://labjack.com/support/software/... . I downloaded the driver and installed it. It generated a liblabjackusb.so file in /usr/local/lib. All the undefined reference errors are methods/functions implemented in the driver source file. How do I modify my CMakeLists.txt to allow my only executable (jimmy_state_publisher.cpp) in the ROS package to use the liblabjackusb.so file? What modifications in the CMakeLists.txt file do I need to make for the package to compile?

CMakeLists.txt:

cmake_minimum_required(VERSION 2.8.3)

project(jimmy_v2)

find_package(catkin REQUIRED COMPONENTS roscpp rospy sensor_msgs std_msgs tf)

catkin_package()

include_directories(include ${catkin_INCLUDE_DIRS})

add_executable(jimmy_state_publisher src/jimmy_state_publisher.cpp)

target_link_libraries(jimmy_state_publisher ${catkin_LIBRARIES})

I did #include "labjackusb.h" in the executable file that I created.

How do I modify the CMakeLists.txt file to take the labjackusb.so file into consideration? or if that is the wrong question, how do I build my project successfully?

If any information that you need is omitted I apologize.... simply let me know what else I need to include.

Thank you in advance.

Hello. I have Sick LMS200 30106 (sitting on top of a servo) and it is connected to my PC via RS422 to USB. Here is what it looks like:

I am using Ubuntu 14.04 with ROS indigo. I am using the sicktoolbox_wrapper package to pass the scan data to RViz (via the /scan topic). I am able to see a single scan line at a time in RViz:

I am trying to create a 3D model like this gentleman: https://www.youtube.com/watch?v=-Tpqw... . In the comments he alludes to a SickLms package, but I have not been able to find it in the ROS packages in the software section. I played a bunch with all the settings in the LaserScan type in RViz, and read http://wiki.ros.org/rviz/DisplayTypes... , and I could not figure out how to make the data appear in 3D. I also searched all over the web, but could not find any instructions on how to achieve this objective (except this - http://library.isr.ist.utl.pt/docs/ro... , but it is too complex for me to understand if this is what I need to pursue).

I am new to ROS, and from what I saw online I am not the first person who is very new to ROS to seek this objective. Could you please provide some guidance on how to do this? Does a package exist for this purpose? And if not, which packages do I need to learn to achieve my objective?

Thanks in advance!

@gvdhoorn I have a feeling you very aware of the robotic landscape, and I have a question. Are you aware of any robot co

@gvdhoorn Thanks for you perspective on the package. I was already leaning towards writing my own code, and was looking

advice for autodock vs. custom node Hello. I built a custom mobile robot that runs Noetic on Ubuntu 20.04; and the ROS N

I am currently drawing out my robot using URDF. I am at the end of the first URDF tutorial (see http://wiki.ros.org/urdf/Tutorials/Bu... ). My problem: once I added my mesh, it is very disproportionate to the rest of the drawing, and I have no idea how to resize the mesh. The tutorial states that: "Meshes can also be sized using relative scaling parameters or a bounding box size"

where do I find an example? Where is the documentation? and if no documentation or examples exist, could you please provide an example of code for a "bounding box" or "relative scaling"?

More detail:

image before meshes are added in urdf file:

image after meshes are added in urdf file:

the code importing the meshes:

   <!-- *********************(21) LMS LINK - MESHES****************************-->
  <!-- a "link" is the part that we are creating. All the internal tags describe
       this part. This is the body of Jimmy (both square levels) -->
  <link name="LMS_link">
    <visual>
      <geometry>
        <!--box dimensions is Meters. L X W X H where the L X H is a rectangle, 
            and the H extrudes it upwards -->
        <mesh filename="package://urdf_tutorial/meshes/LMS-200-30106.dae"/>
      </geometry>
      <origin rpy="0 0 0" xyz="0 0 0"/>
      <material name="white"/>
    </visual>
  </link>

    <!-- *********************(22) LMS to LMS PLATE JOINT **********************-->
    <!-- a joint allows us to create a relationship between two links (parts)-->
      <joint name="LMS_to_LMS_plate_joint" type="fixed">
        <parent link="LMS_plate_link"/>
        <child link="LMS_link"/>
        <!-- this is the point at which the two parts attach to one another-->
        <origin xyz="0 0 0"/>
      </joint>

I am building a URDF because it was suggested here: https://answers.ros.org/question/2718...

@thodor I used a vanilla 20.04 that I downloaded on Oct 30; and I'm pretty sure the kernel was a 5.4.0, as that is the k

@thodor I used a vanilla 20.04 that I downloaded on Oct 30; and I'm pretty sure the kernel was a 5.4.0, as that is the k

@thodor I used a vanilla 20.04 that I downloaded on Oct 30; and I'm pretty sure the kernel was a 5.4.0, as that is the k

It looks like this issue is a bug with RViz. See: https://github.com/ros-visualization/rviz/issues/1508 However, in th

I had the same issue. When changing to the Points, they are very large, and make the PC work extra hard. If other opti

It looks like this issue is a bug with RViz. See: https://github.com/ros-visualization/rviz/issues/1508 However, in th

It looks like this issue is a bug with RViz. See: https://github.com/ros-visualization/rviz/issues/1508 However, in th

@eschoof I have the same issue. Did you find a work around or solution? Looks like it's an RViz bug: https://github.com/

@eschoof I have the same issue. Did you find a work around or solution?

Thanks a ton! This really helped me!

@Dragonslayer THANK YOU!!! I didn't even think of the 60cm of dead space. That makes a HUGE impact on me! Thanks for poi

@Dragonslayer The lider used to be in that position, and it's not ideal, as other issues start to happen (mapping algori

Hello. The project is running Ubuntu 16.04, with Kinetic on an Intel PC.

Some background: I designed and built a robot, and was at the SLAM phase. The turtlebot tutorials (https://learn.turtlebot.com/) are a great guide to SLAM for a person like me. Then, I experienced a real kick in the pants - it turns out that the current offering of SLAM packages is geared towards horizontal (planar) lidar, and not vertical lidar like the one I built (see: https://answers.ros.org/question/3466...). Well, life is a learning experience so I built a new horizontal 3D lidar system:

At present the new horizontal/planar lidar system is hanging onto the robot with zip ties, and needs to be mounted onto the robot:

Before I rip out the vertical 3D lidar system, and replace it with the horizontal system I need to decide the height at which to place the new horizontal lidar. I have a group of related questions that I am hoping will guide the placement:

• It is my understanding that gmapping is the recommended mapping engine for the Navigation stack (https://wiki.ros.org/navigation/MapBu...). Is gmapping still the best tool for creating a 2D map (given the 3D lidar)?
• I want to create a 2D map, but avoid obstacles using the full 3D lidar data (exactly like the video on the navigation stack home page: https://wiki.ros.org/navigation). Using the navigation stack with gmapping, and amcl will I be able to reach this objective?
• Can you please recommend package combinations that will allow the robot to build a 2D map, localize in the map, and navigate to points on the map while avoiding obstacles using the full horizontal 3D lidar data?

I am pre-emptively asking these questions becasue I don't want to rebuild my robot to later learn I positioned the lidar in a way that does not work optimally with the current SLAM offerings.

Thanks a ton for your time!

Mike

Edit #1 - I appreciate all suggestions for packages that prevent bumping into the top of the table as I navigate around the table legs; also I don't want to run over things laying on the floor. On closer analysis, it looks like like the PR2 has a pitching lidar AND a fixed lidar, AND rgbd cameras. I am really hoping to get some guidance on package selection for building a map, localizing, and navigating to points on the map (map of my apartment - small area). I would prefer to do it all via lidar, but if more "cheap" hardware will really help, I am very open to those suggestions. Any full working solutions are very, very appreciated. Thanks again.

@stevemacenski Hi Steve, I implemented your answer in my physical robot. During the lidar motion when lidar is horizont

@stevemacenski Hi Steve, I implemented your answer in my physical robot. During the lidar motion when lidar is horizont