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Hello,

I tried to follow this instructions but I was not able to deploy two turblebots: I see just one /odom and /cmd_vel topic. Besides the modification to the aforementioned gazebo_ros_create.cpp I use to launch file for the two turtlebots, here I just report one, the second differs just by the namespace.

Thank you

<launch>
<group ns="SCORZIE">
  <param name="robot_description" command="$(find xacro)/xacro.py '$(find turtlebot_description)/urdf/turtlebot.urdf.xacro'"/>
</group>
  <node name="spawn_turtlebot_model" pkg="gazebo" type="spawn_model" args="$(optenv ROBOT_INITIAL_POSE) -unpause -urdf -param robot_description -x 9 -y 5 -z 0.05 -model turtlebot1" respawn="false" output="screen" ns="SCORZIE"/>

  <node pkg="diagnostic_aggregator" type="aggregator_node" name="diagnostic_aggregator" ns="SCORZIE" >
    <rosparam command="load" file="$(find turtlebot_bringup)/config/diagnostics.yaml" />
  </node>

  <node pkg="robot_state_publisher" type="state_publisher" name="robot_state_publisher" output="screen" ns="SCORZIE">
    <param name="publish_frequency" type="double" value="20.0" />
  </node>


  <!-- The odometry estimator -->

  <node pkg="robot_pose_ekf" type="robot_pose_ekf" name="robot_pose_ekf" ns="SCORZIE">
    <param name="freq" value="30.0"/>
    <param name="sensor_timeout" value="1.0"/>
    <param name="publish_tf" value="true"/>
    <param name="odom_used" value="true"/>
    <param name="imu_used" value="false"/>
    <param name="vo_used" value="false"/>
    <param name="output_frame" value="odom"/>
    <param name="output_frame" value="odom" />
  </node>


  <!-- throttling -->
  <node pkg="nodelet" type="nodelet" name="pointcloud_throttle" args="load pointcloud_to_laserscan/CloudThrottle openni_manager" respawn="true" ns="SCORZIE">
    <param name="max_rate" value="20.0"/>
    <remap from="cloud_in" to="/camera/depth/points"/>
    <remap from="cloud_out" to="cloud_throttled"/>
  </node>

  <!-- Fake Laser -->
  <node pkg="nodelet" type="nodelet" name="kinect_laser" args="load pointcloud_to_laserscan/CloudToScan openni_manager" respawn="true" ns="SCORZIE">
    <param name="output_frame_id" value="/camera_depth_frame"/>
    <!-- heights are in the (optical?) frame of the kinect -->
    <param name="min_height" value="-0.15"/>
    <param name="max_height" value="0.15"/>
    <remap from="cloud" to="/cloud_throttled"/>
  </node>

  <!-- Fake Laser (narrow one, for localization -->
  <node pkg="nodelet" type="nodelet" name="kinect_laser_narrow" args="load pointcloud_to_laserscan/CloudToScan openni_manager" respawn="true" ns="SCORZIE">
    <param name="output_frame_id" value="/camera_depth_frame"/>
    <!-- heights are in the (optical?) frame of the kinect -->
    <param name="min_height" value="-0.025"/>
    <param name="max_height" value="0.025"/>
    <remap from="cloud" to="/cloud_throttled"/>
    <remap from="scan" to="/narrow_scan"/>
  </node>


</launch>