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Questions tagged [joint-state]

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Which unit is Gazebo using when publishing to joint_states?

Hello. I'm wondering which unit Gazebo is using when publishing to the topic joint_states. According to the message definition it could be (for the velocity) rad/s or m/s. I would appreciate any hint ...
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dynamixel_workbench_controller does not publish joint states during motion

Hi, I am using the dynamixel_workbench_controller to control a single MX-28. It works great, joint states are published and I can move it using the joint_operator. however, during the execution of the ...
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How to interpret position in JointStateInterface

The context is a robot with 2 drive wheels, using the ros_control diff_drive_controller. I would like to know if it is well ...
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Robot Model does not follow TF frames in RViz

I want to visualize the UR5 robot model in RViz. For that, I am using the following launch file, ...
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Fetch robot, joint_state topic sometimes contains all joints, sometimes doesn't

I am programming with the Fetch robot (the physical one, not Gazebo simulation). I use my laptop with the following settings: Macbook Pro Late 2013 edition Ubuntu 14.04 installed as sole operating ...
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Get link absolute orientation - IMU position

Can anyone advise how to calculate the quaternion orientation of a link? I'm following a somewhat unconventional approach and using an IMU that outputs it's absolute quaternion to measure the position ...
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Minimum time between publishing a joint state and tf listener update

Hi, I have 8 laser range finders propped up on a rotating vertical rod connected to a motor. The laser range finders is fixed to the sides of the rod at some 'xyz rpy' pose. I get the current angular ...
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The Topics generated by the JTAC have no data

Hello Everyone, I am working on creating a Moveit!-Gazebo Interface for my Robot and later also expanding it to create a Hardware Interface so that real Robot can act on the trajectory decided by ...
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How can I sync massages from two different topics?

Hi, I am working with Baxter robot and I am trying to synchronize robot_joints which is running in first terminal,and endpoint_state which is running in the second terminal. In other word, I want to ...
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Best way to get FK for many different joint-states

Hello! I am trying to calculate the end-effector pose for a huge amount of different JointStates. The two ingredients to do that are my URDF and the numpy array that contains the joint angles. I am ...
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How to set an intial joint state to a robot arm in gazebo

Is there a way to give an initial joint state to a robot arm in gazebo? (e.g. from the launch file setting) Originally posted by johnyang on ROS Answers with karma: 66 on 2016-08-25 Post score: 0
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ImportError: No module named QtCore

I have my robot model as a URDF file and when I launch it in a launch file to display it in Rviz, I get the following error : ...
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Publish Joint_State with Python to RVIZ

I have a robot that I built in URDF that I am visualizing in RVIZ. I can control the joints using the gui tool or a rostopic pub command, but I am unable to build a publisher node to interface with ...
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