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2016-06-01 05:34:41 -0500	commented answer	GPS integration in robot_localization One more thing that I want to ask is, robot localization will work with only gps or it needs IMU sensor also ? By saying Transformation from odom-> base_link do you mean integration of one more sensor ?
2016-06-01 04:08:16 -0500	commented answer	GPS integration in robot_localization Thanks for the reply IvanV, Do you mean in parameter values there should be only frame names like map, odom, base_link as given in default ? I changed those things you mentioned earlier, still not getting anything. Can you please tell more about problems in my configurations.
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2016-06-01 01:32:06 -0500	asked a question	GPS integration in robot_localization Hello all, I am trying to integrate UBlox Lea6h gps module with robot_localization, this gps is to be mounted on my quadcopter. I am using ros indigo in ubuntu 14.04. By using NavSatFix of rosserial I am feeding lat and long data with a rostopic /fix to the navsat_transform_node. My `rostopic echo /fix` output : `header: seq: 84 stamp: secs: 1464760028 nsecs: 759104988 frame_id: /fix status: status: 0 service: 0 latitude: 19.1345443726 longitude: 72.906288147 altitude: 0.0 position_covariance: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] position_covariance_type: 0` I don't know how to find out and where to write the position covariance. My ekf_localization_node: <launch> <node pkg="robot_localization" type="ekf_localization_node" name="ekf_localization" clear_params="true"> <!-- ======== STANDARD PARAMETERS ======== --> <param name="frequency" value="30"/> <param name="sensor_timeout" value="0.1"/> <param name="two_d_mode" value="false"/> <param name="map_frame" value="map"/> <param name="odom_frame" value="odom"/> <param name="base_link_frame" value="base_link"/> <param name="world_frame" value="map"/> <param name="transform_time_offset" value="0.0"/> <param name="odom0" value="/odometry/gps"/> <rosparam param="odom0_config">[true, true, false, false, false, false, false, false, false, false, false, false, false, false, false]</rosparam> <param name="odom0_differential" value="false"/> <param name="odom0_relative" value="false"/> <param name="print_diagnostics" value="true"/> <!-- ======== ADVANCED PARAMETERS ======== --> <param name="odom0_queue_size" value="2"/> <param name="odom0_pose_rejection_threshold" value="5"/> <param name="odom0_twist_rejection_threshold" value="1"/> <param name="debug" value="false"/> <param name="debug_out_file" value="debug_ekf_localization.txt"/> <rosparam param="process_noise_covariance">[0.05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.06, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.03, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.03, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.06, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.025, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.025, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.04, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.015]</rosparam> <rosparam param="initial_estimate_covariance">[1e-9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ... (more)
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2016-04-20 11:36:20 -0500	commented answer	Tried to publish before configured topic id 125 Hey Vmato thanks a lot. I was forgetting to add install path. It worked now.
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2016-04-20 06:26:10 -0500	commented answer	Publishing multiple data types in one ros topic in Arduino Hi Nicholas I made header file for string and integer data type as you said. Now I am having another issue I posted here :link text
2016-04-20 06:24:07 -0500	asked a question	Tried to publish before configured topic id 125 Hi I am using rosserial arduino, from the tutorial link text I made my custom message file which contains string and integer data types in catkin_ws/src/beginner_tutorials/msg/Datatype.msg and converted it into a header file Datatype.h, After that I ran following command`rosrun rosserial_arduino make_libraries.py .` It created header datatype.h in /sketchbook/libraries/roslib/beginner_tutorials. Now I am able to compile my header file . But while running serial_node.py I am getting following errors: pankaj@pankaj-HP-Pavilion-dv4-Notebook-PC:~$ rosrun rosserial_python serial_node.py /dev/ttyACM0`[INFO] [WallTime: 1461149079.336082] ROS Serial Python Node [INFO] [WallTime: 1461149079.343509] Connecting to /dev/ttyACM0 at 57600 baud [ERROR] [WallTime: 1461149082.330481] Creation of publisher failed: beginner_tutorials `ROS path [0]=/opt/ros/indigo/share/ros ROS path [1]=/opt/ros/indigo/share ROS path [2]=/opt/ros/indigo/stacks [ERROR] [WallTime: 1461149083.266678] Tried to publish before configured, topic id 125 [ERROR] [WallTime: 1461149083.266678] Tried to publish before configured, topic id 125 [ERROR] [WallTime: 1461149083.266678] Tried to publish before configured, topic id 125 Other examples of arduino like Hello world are working fine. I am getting error only when I use my custom message header.`Why am I getting this error ? please help.
2016-04-19 03:43:40 -0500	commented answer	Publishing multiple data types in one ros topic in Arduino Thanks Nicholas for replying, I am reading an arduino mega board by ros. I have string, integer and float data coming from arduino and I want to print all data in one terminal. But I can see only one type of data in one terminal by rostopic echo. How can I do this ? I am new to ROS.
2016-04-18 13:18:12 -0500	asked a question	Publishing multiple data types in one ros topic in Arduino Hi all, I followed this tutorial for rosserial in arduino link text But here in this tutorial I need to add different ros topics for every new data types like string, int ,float etc. What if I want to publish multiple data types in a single ros topic ? What should I do ?
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2016-03-21 03:36:49 -0500	answered a question	Problem in running hector_quadrotor launch files. Actually when I do not source catkin workspace with `~/catkin_ws$ source devel/setup.bash` Then It doesn't show that error and I am able to launch all those files inside hector_quadrotor_gazebo. I tried to run what you said, and it gives following output : `pankaj@patel-lab:~/catkin_ws$ rosrun controller_manager controller_spawner [rosrun] Couldn't find executable named controller_spawner below /home/pankaj/catkin_ws/src/controller_manager` It gives the same output whether I source to catkin workspace or not.
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2016-03-13 07:58:03 -0500	asked a question	Problem in running hector_quadrotor launch files. Hi all, I am new to ROS and trying to use hector_quadrotor for my project. I am using Ubuntu 14.04, ROS indigo and gazebo 2.2.3. When I launch any of the launch files present inside the package "hector_quadrotor_gazebo" then it gives error : `ERROR: cannot launch node of type [controller_manager/controller_spawner]: can't locate node [controller_spawner] in package [controller_manager]` and nothing appears in gazebo simulator. Although controller_manager is present at location : /opt/ros/indigo/share. How to fix that error ?