Safeer's profile - activity

Again, check if the sensor is working fine.

Check if your sensor is working fine and is at an acceptable distance from an object.

Oh! Good to hear, good luck!

Yes I was able to solve it. It had something to do with the degradation from Hydro to Groovy. A fresh installation fixed it.

I am using ROS Groovy on Ubuntu 12.04 LTS.

I am facing the following errors:

[cmd_vel_mux-8] process has finished cleanly

[mobile_base -6] process has finished cleanly

[bumper2pointcloud-9] process has finished cleanly

The generated log files show: bond broken. exiting

After these error messages on the console, the turtlebot stops moving.

I think these errors occur when I try to publish velocity to move the robot. However, I am not sure if this is the only reason.

Btw, the 'icon on top' is just a shortcut for this 'bringup' package. Nothing else :)

Okay so, we installed this Linux which had already ROS integrated in it. It is customized for Turtlebot. It came with our turtlebot. turtlebot_bringup is a package that initiates our turtlebot's motors. We need to run it in order to initialize it. I hope I've made myself clear.

I meant, the turtlebot_bringup service.

I am using ROS Groovy on Ubuntu 12.04 LTS. I am programming in C++

My problem is that turtlebot service is crashing frequently whenever I run a specific node. The icon of TurtleBot on the Top-Right side remains white, showing that service is still running but the robot doesn't move when the velocity is published.

I think the problem is due to the sockets in my node because I have run some other nodes and the robot work fines. I have tried both, turtlebot bringup and turtlebot service.

How should I stop the turtlebot service or turtlebot bringup from being crashed?

I have followed the SLAM Gmapping tutorial. I have used rviz to set the goal for the robot.

I want to write a program in which robot moves autonomously. Therefore, I want to ask how can I set the current pose and navigation goal in the code (cpp node) without using the rviz? And also how can I used the learned (and saved) map in my code (cpp node)?

I am using this code

topic is: /camera/depth/image
type: /sensor_msgs/Image

According to the code, (msg->data[0]) is providing the value of Top-Left Corner.

I wanted to ask:

1. How can I get the value of the Top-Right Corner, Centre, etc.
2. How can I get the normal depth value that can tell me the distance from the object? Do I need to do some mathematical work or is there a method?

I have attached my code. I am trying to make the turtlebot go backward once the bumper is pressed. I'm able to make it move forward and get the bumper pressed signal separately. The problem I'm facing is that it I cannot make them work together. It either moves forward or send the bumper pressed signal. (Depending upon where ros::Spin() is placed)

I think the issue is about the ordering/placement of the following lines in my PublishData Class.

ros::Subscriber bumper = n.subscribe("/mobile_base/events/bumper",1, callback);
pub_data.publish(tw);
ros::spin();

My Code:

void callback(const kobuki_msgs::BumperEventConstPtr msg)
{
      ROS_ERROR("MOVE!!! Bumper pressed.");
      ROS_INFO("MOVE!!! Bumper pressed.");

}
class PublishData
{
      ros::NodeHandle n;
      ros::NodeHandle n1;
    public:
      PublishData()
      {
        ros::Publisher pub_data = n.advertise<geometry_msgs::Twist>("/mobile_base/commands/velocity", 10);
        geometry_msgs::Twist tw;
        tw.linear.x = 0.1;
        ROS_INFO("DataPublished");

        while(ros::ok())
        {
            ros::Subscriber bumper = n.subscribe("/mobile_base/events/bumper",1, callback);
            //ROS_WARN("In Loop.");
            pub_data.publish(tw);
            ros::spin();
        }
      }
};


int main(int argc, char **argv)
{
  ros::init(argc, argv, "move_data");
  PublishData object;
   return 0;
}

After running apt-get dist-upgrade on ROS Hydro, simulated robot is not responding to published messages. The simulator is running perfectly. The code/topics are working fine on Turtle-bot (hardware) i.e. publishing and subscribing.

rosdep --version: 0.10.24

export | grep ROS gives us this:

declare -x ROS_DISTRO="hydro"
declare -x ROS_ETC_DIR="/opt/ros/hydro/etc/ros"

We have started to work on Turtlebot and new to ROS. Any help will be appreciated.

thanks in advance

I want to send data from one node to another. For example: One node is publishing data to the topic /mobile_base/commands/velocity and other one is subscribed to /mobile_base/events/bumper. Both the subscriber & publisher are working fine.

What I want to do is to make the robot move backward once the bumpers are pressed. I do not know how to send the event of bumper pressed to the other node.

The solution I thought was of using pipes or sockets or shared memory to exchange data between two nodes.

Is this the right approach? Or does ROS has a builtin method for that?

Thanks in Advance.

I am trying to compile the code given at this page

I am using ROS Groovy on Ubuntu 12.04

When I run catkin_make, I get the following error:

CMake Error at /opt/ros/groovy/share/catkin/cmake/catkinConfig.cmake:72 (find_package):
  Could not find a configuration file for package opencv.

  Set opencv_DIR to the directory containing a CMake configuration file for
  opencv.  The file will have one of the following names:

    opencvConfig.cmake
    opencv-config.cmake

Call Stack (most recent call first):
  learning_image_transport/CMakeLists.txt:7 (find_package)

CMake Error at learning_image_transport/CMakeLists.txt:82 (target_link_libraries):
  Cannot specify link libraries for target "learning_image_transport_node"
  which is not built by this project.

learning_image_transport is my package name.

Cmake file:

cmake_minimum_required(VERSION 2.8.3)
project(learning_image_transport)
find_package(catkin REQUIRED COMPONENTS cv_bridge image_geometry image_transport opencv)
find_package(OpenCV)    
include_directories(include  
 ${catkin_INCLUDE_DIRS} /opt/ros/groovy/share/OpenCV)

Package.xml:

  <buildtool_depend>catkin</buildtool_depend>
  <build_depend>cv_bridge</build_depend>
  <build_depend>image_transport</build_depend>
  <build_depend>opencv2</build_depend>
  <build_depend>image_geometry</build_depend>
  <build_depend>opencv</build_depend>  
  <build_depend>OpenCV</build_depend>
  <run_depend>cv_bridge</run_depend>
  <run_depend>image_transport</run_depend>
  <run_depend>opencv2</run_depend>

I have tried to follow the methods describe in various questions, with same problem, such as this and some more. However, the problem still exists in my case.