mree's profile - activity

Is it possible for me to create an User Interface which allow me to run some nodes by just clicking buttons without typing codes in the terminal?

I want to remote run some nodes, below was my coding

<launch>
  <!-- This assumes roscore is running on other machine -->
  <env name="ROS_MASTER_URI" value="http://robot1:11311"/>

  <machine name="robot1" address="192.168.0.101" password="123456" env-loader="/home/robot1/catkin_ws/test.sh" user="robot1"/>


  <group ns="robot1">
    <node machine="robot1" pkg="rqt_graph" type="rqt_graph"  name="rqt_graph">
    </node>
  </group>

</launch>

the sh file as below:

#!/bin/bash

export ROS_WS=/home/robot1/catkin_ws
export PATH=$ROS_ROOT/bin:$PATH
export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:$ROS_WS
exec "$@"

Then its show the error like that

error launching on [192.168.0.101-0, uri http://robot1:59866/]: ERROR: Traceback (most recent call last):
  File "/opt/ros/groovy/lib/python2.7/dist-packages/roslaunch/server.py", line 323, in launch
    succeeded, failed = runner.launch()
  File "/opt/ros/groovy/lib/python2.7/dist-packages/roslaunch/launch.py", line 644, in launch
    self._setup()
  File "/opt/ros/groovy/lib/python2.7/dist-packages/roslaunch/launch.py", line 620, in _setup
    self._launch_master()
  File "/opt/ros/groovy/lib/python2.7/dist-packages/roslaunch/launch.py", line 409, in _launch_master
    self._check_and_set_run_id(param_server, self.run_id)
  File "/opt/ros/groovy/lib/python2.7/dist-packages/roslaunch/launch.py", line 440, in _check_and_set_run_id
    raise RLException("run_id on parameter server does not match declared run_id: %s vs %s"%(val, run_id))
RLException: run_id on parameter server does not match declared run_id: 646b03ea-cd93-11e4-8335-c4d9876410bd vs 0620d648-cd57-11e4-beca-3417eba36e32

Launch of the following nodes most likely failed: rqt_graph/rqt_graph

Hi everyone,

I would like to know how to monitor all the data transfer between ros.

There are two computers connected by using same roscore master. I want to measure the amount of data transfering every second or in a period.

Thanks

Thank you very much, its much more smooth by setting it to compressed.

Sorry for asking some stupid questions.

rosrun image_view image_view image:=/usb_cam/image_raw _image_transport:=compressed

However, when the odom frames move, the robot remains stationary. The transform from map to odom published by gmapping and amcl is not send to the base_link

I have made this change:

odom.pose.pose.position.x = transform.getOrigin().x();
odom.pose.pose.position.y = transform.getOrigin().y();
odom.pose.pose.position.z = 0.0;
odom.pose.pose.orientation.z =tf::getYaw(transform.getRotation());;

do you mean i should use this lookuptransform instead of odom to get my robot pose? something like this:

try { listener.lookupTransform("map", "base_link", ros::Time(0), transform_in_map); } catch(tf::TransformException &exception) { ROS_ERROR("%s", exception.what()); }

Currently I am getting my robot position in map by this way:

odom.pose.pose.position.x = x_move;
odom.pose.pose.position.y = y_move;
odom.pose.pose.position.z = 0.0;
odom.pose.pose.orientation = tf::createQuaternionMsgFromYaw(w_move);

Hello, thank you for spending your time try to help my problem.

Now I have two computers and would like to show the steam video on both computers through wifi connection.

the package Im using is usb_cam,

by using the same master host from one computer ( ROS_MASTER_URI=http://xxx:11311)

It could shows the video but in very low fps and unstable if the resolution is higher than 480p

To sustain fps around 20, the maximum is 240p.

But the wifi connection shows is around 200-300 mbps.

What should i do to improve this?

Best, mree

my tf tree now is /map -> /odom -> base_link

is it what you means as below? /map -> /base_link /map -> /odom

Sorry for late reply, but my odometry transform is from odom to base_link. How could achieve directly from /amp ->/base_link

Im using the move_base, there are some topics of local_costmap

and Im following a tutorial using grid cell to display the cost on map,

but I find nothing as shown below with the rqt_graph

What should I do with?

Best, Evoe

I tried to change my fixed frame to odom but the "jump" is even more aggressive. Here is the video https://www.youtube.com/watch?v=g9jxh...

Hi, I have an odometry obtained from encoders but it is not accurate enough. In long periods, the error accumulated the robot position not accurate. I know that gmapping publish a tf transform from map to odom. Can I subscribe this transform and add it into my odometry or the transform from odom to baselink so that the position of my robot is more accurate?

I am using encoders to calculate the odometry of my mobile robot. However, sometimes the position of robot will suddenly jump. The following video shows how the robot jump: https://www.youtube.com/watch?v=Q2W1q...

The encoder_distance topic at 0.39 is the encoder pulse topic. The pulses of the encoders do not jump when the robot jumps. I wonder if the jumping is caused by tf error? Please help me.