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2021-12-15 14:08:29 -0500 answered a question 'catkin build' gives 'command not found

Following instructions on https://catkin-tools.readthedocs.io/en/latest/installing.html fixed the problem for me $ sudo

2020-12-19 08:34:14 -0500 edited answer Ros Navigation - Global costmap not seen on rviz and not used for global planning

@kllysin Hello! did you manage to figure this out? A few things that came to my mind after reading this, let me know if

2020-12-19 08:33:50 -0500 edited answer Ros Navigation - Global costmap not seen on rviz and not used for global planning

@kllysin Hello! did you manage to figure this out? A few things that came to my mind after reading this, let me know if

2020-12-19 08:33:14 -0500 answered a question Ros Navigation - Global costmap not seen on rviz and not used for global planning

@kllysin Hello! did you manage to figure this out? A few things that came to my mind after reading this, let me know if

2020-12-01 07:08:56 -0500 received badge  Necromancer (source)
2020-10-08 02:43:43 -0500 commented answer How to update map to odom with corrections from SLAM ?

Thanks brilliant suggestion!

2020-06-25 05:38:38 -0500 answered a question questions about dijkstra algorithm used in navfn package to path planning

Attempting to answer the questions for whoever that might find them useful : * line 161,what does “ *float *potarr ” me

2020-06-25 05:19:08 -0500 commented answer navfn algorism

@2ROS0 It is called Wavefront expansion algorithm https://en.wikipedia.org/wiki/Wavefront_expansion_algorithm but it ess

2020-06-25 05:18:39 -0500 commented answer navfn algorism

It is called Wavefront expansion algorithm https://en.wikipedia.org/wiki/Wavefront_expansion_algorithm but it essentiall

2020-06-25 05:18:39 -0500 received badge  Commentator
2020-06-25 05:11:18 -0500 answered a question Algorithms A* and Dijkstra

For anyone that could be interested in this in the future, attaching a project of mine I did earlier which visualises De

2020-06-25 05:07:59 -0500 answered a question How to make a geometry_msgs/PoseArray and then visualise it using rviz?

For anyone that could be interested in this in the future, attaching a project of mine I did earlier which visualises De

2020-06-25 05:02:02 -0500 answered a question How can I visualize Dijkstra and A* steps in rviz?

For anyone that could be interested in this in the future, attaching a project of mine I did earlier which visualises De

2020-05-11 03:16:26 -0500 received badge  Necromancer (source)
2020-05-11 00:19:24 -0500 answered a question How do you change default python version in ros from 3.7 to 2.7 without re-installing everything?

For anyone else who had this problem, reinstalling everything is not necessary, this should solve your problem : Ensur

2020-05-10 08:08:27 -0500 commented question How do you change default python version in ros from 3.7 to 2.7 without re-installing everything?

@isauma How did you solve this problem?

2019-12-13 01:41:56 -0500 received badge  Civic Duty (source)
2019-11-28 01:42:39 -0500 commented question Running a simulated odometry node

@hitesh Thanks for this code!

2019-10-22 01:01:10 -0500 commented answer How Cartographer publishes Map to base_link transform?

Cartographer insists that the tracking frame be co-located at the same place as the IMU frame and gives an error if it d

2019-10-18 01:31:12 -0500 answered a question How Cartographer publishes Map to base_link transform?

Hey, just pitching my two cents here, hope this helps. Really wanted to write an answer but a really good answer to

2019-10-09 01:00:37 -0500 edited answer Creating /tf (position) from IMU, 2D/3D SLAM (LiDAR+IMU+Octomap) (no need for high accuracy))

Hello! I am sorry I am really late to this thread but heres how I would do it, I would also love to hear how you ended u

2019-10-09 00:56:00 -0500 edited answer Creating /tf (position) from IMU, 2D/3D SLAM (LiDAR+IMU+Octomap) (no need for high accuracy))

Hello! I am sorry I am really late to this thread but heres how I would do it, I would also love to hear how you ended u

2019-10-09 00:54:14 -0500 edited answer Creating /tf (position) from IMU, 2D/3D SLAM (LiDAR+IMU+Octomap) (no need for high accuracy))

Hello! I am sorry I am really late to this thread but heres how I would do it, I would also love to hear how you ended u

2019-10-09 00:53:18 -0500 answered a question Creating /tf (position) from IMU, 2D/3D SLAM (LiDAR+IMU+Octomap) (no need for high accuracy))

Hello! I am sorry I am really late to this thread but heres how I would do it, I would also love to hear how you ended u

2019-08-25 23:00:29 -0500 marked best answer How to increase frequency of /diagnostics topic published by epos_hardware node?

Dear ROS community,

I am using the epos_hardware ROS package as a hardware interface between an effort controller and a EPOS2 motor controller coupled with a Maxon EC90 motor. The set up is working properly and I am able to control the motor using ROS control by sending torque commands to the controller manager. I am trying to interface Simulink with ros_control by sending torque commands directly from the controller in Simulink to ros_control and hence I need real time feedback of the motor's anglular position.

The Problem: This angular position is published by the epos_hardware node on the /diagnostics topic in the diagnostics_msgs/DiagnosticArray message form with the frequency of one message per second. I need atleast 100 or 1000 messages per second and hence I want to increase frequency of the /diagnostics topic.

Solution Attempt: I went through the epos_hardware package and found the snippet of code inside the epos_hardware_node.cpp file which according to me is setting the frequency of the diagnostics topic. :

ros::Rate controller_rate(50);
  ros::Time last = ros::Time::now();
  while (ros::ok()) {
    robot.read();
    ros::Time now = ros::Time::now();
    cm.update(now, now-last);
    robot.write();
    last = now;
    robot.update_diagnostics();
controller_rate.sleep();

I have tried changing the controller_rate but that does not seem to affect the frequency of the topic at all. Am I thinking in the right direction or is there something else I should be looking at? I would like to request anyone who can guide me how to increase frequency of the /diagnostics topic.

P.S. : I have already tried using the Simulink Pacer block to try and reduce the speed of its execution but any further decrease in sampling will affect the controller performance.

Any help would be greatly appreciated! Thanks in advance!

2019-08-25 23:00:29 -0500 received badge  Scholar (source)
2019-08-02 04:52:26 -0500 answered a question What is the difference between global planning and local planning?

A two step planning approach of global planning and local planning (also called as Hierarchical Planning) is explained w

2019-07-14 09:40:01 -0500 commented answer Raspberry camera module not working on Raspberry Pi 3 B

Alright, then I am afraid this is not a ROS related problem, you could use other forums like stack exchange to get bette

2019-07-14 03:06:22 -0500 edited answer Raspberry camera module not working on Raspberry Pi 3 B

So, out of the top of my head, have you tried using picamera (https://picamera.readthedocs.io/en/release-1.13/) on th

2019-07-14 03:05:47 -0500 answered a question Raspberry camera module not working on Raspberry Pi 3 B

So, out of the top of my head, have you tried using picamera (https://picamera.readthedocs.io/en/release-1.13/) on th

2019-07-14 03:05:47 -0500 received badge  Rapid Responder (source)
2019-07-11 01:14:33 -0500 answered a question mavros with serial connection

I had a similar issue, px4.launch was executing properly but no heartbeat inspite of the UART serial communication worki

2019-07-11 01:12:51 -0500 answered a question Mavros topics not publishing?

I had a similar issue, px4.launch was executing properly but no heartbeat inspite of the UART serial communication worki

2019-07-05 11:11:50 -0500 received badge  Teacher (source)
2019-07-05 11:11:50 -0500 received badge  Necromancer (source)
2019-07-05 01:21:30 -0500 commented answer robot_localization asking for map to odom transform

@RayROS I have edited my answer. Hope it helps.

2019-07-05 01:20:49 -0500 edited answer robot_localization asking for map to odom transform

A more appropriate answer to this issue is that, there is a mismatch in timestamps between when the ekf_localization is

2019-07-01 07:29:25 -0500 edited answer robot_localization asking for map to odom transform

A more appropriate answer to this issue is that, there is a mismatch in timestamps between when the ekf_localization is

2019-07-01 06:52:34 -0500 edited answer robot_localization asking for map to odom transform

A more appropriate answer to this issue is that, there is a mismatch in timestamps between when the ek_localization is m

2019-07-01 06:52:05 -0500 answered a question robot_localization asking for map to odom transform

A more appropriate answer to this issue is that, there is a mismatch in timestamps between when the ek_localization is m

2019-06-25 06:05:18 -0500 commented answer robot_localization asking for map to odom transform

@emilyfy I have this exact same problem, where I want the robot_localization to calculate map->odom but it also sho

2019-06-25 06:03:38 -0500 commented answer robot_localization asking for map to odom transform

I have this exact same problem, where I want the robot_localization to calculate map->odom but it also shows me that

2019-06-25 06:03:11 -0500 commented answer robot_localization asking for map to odom transform

I have this exact same problem, where I want the robot_localization to calculate map->odom but it also shows me that

2019-06-25 05:05:55 -0500 commented answer How to increase frequency of /diagnostics topic published by epos_hardware node?

Yes thank you! I have edited my response from Joint State Publisher to Joint State Controller. You are right, second po

2019-06-25 05:04:25 -0500 edited answer How to increase frequency of /diagnostics topic published by epos_hardware node?

Just answering this one, to hopefully help someone in the future. So as far as I remember, the diagnostics topic is not

2019-06-25 05:04:25 -0500 received badge  Editor (source)
2019-06-21 01:43:33 -0500 edited answer How to increase frequency of /diagnostics topic published by epos_hardware node?

Just answering this one, to hopefully help someone in the future. So as far as I remember, the diagnostics topic is not

2019-06-21 01:42:02 -0500 answered a question How to increase frequency of /diagnostics topic published by epos_hardware node?

Just answering this one, to hopefully help someone in the future. So as far as I remember, the diagnostics topic is not

2019-06-06 01:44:35 -0500 commented question Is this an accurate explanation of a covariance matrix?

Still a great read 7 years later!

2019-01-18 03:04:14 -0500 received badge  Famous Question (source)