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2023-01-07 09:07:08 -0500 received badge  Notable Question (source)
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2021-11-29 05:20:55 -0500 marked best answer Using Rospy to check on empty topic

Hi,

I want to code a simple publisher and subscriber. However, I realized that whenever Ros is subscribing to a topic, e.g.:

rospy.subscriber("/chatter",string,callback)

it will always wait for the topic in the callback function. In this example, lets assume there is no '/chatter' topic published and the user himself had type the wrong topic. I wish to create a some kind of warning to users that warn them regarding "chatter" has not yet been publish or empty. How can I do that?

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2021-03-30 04:15:01 -0500 commented question ROS over network is slow

Hi any luck on this? I was using a CAT6 wire to transmit PWM data from a PC to my raspberry pi via ROS_IP to control m

2021-03-30 04:13:59 -0500 commented question ROS over network is slow

Hi any luck on this? I was using a CAT6 wire to transmit PWM data from a PC to my raspberry pi via ROS SSH to control m

2021-03-18 23:38:56 -0500 commented question How are topics and nodes connected?

Yes. A node is a process that performs computation,It is an executable program running inside your application. (Source

2021-03-18 23:38:15 -0500 commented question How are topics and nodes connected?

Yes. A node is a process that performs computation,It is an executable program running inside your application. (Source

2021-03-18 23:37:53 -0500 received badge  Commentator
2021-03-18 23:37:53 -0500 commented question How are topics and nodes connected?

Yes. A node is a process that performs computation,It is an executable program running inside your application. (Source

2021-03-09 02:34:51 -0500 received badge  Popular Question (source)
2021-03-08 01:39:42 -0500 asked a question JoyStick ROS driver for windows

JoyStick ROS driver for windows Hi, I am using ROS1(Melodic) for Windows. I am wondering if there is a ROS driver for

2021-03-05 00:56:11 -0500 edited answer Is it possible to subscribe and publish same topic in a node?

Technically yes is possible. The example: A chatter node is publishing and subscribing to a "talker" topic But the qu

2021-03-05 00:54:49 -0500 answered a question Is it possible to subscribe and publish same topic in a node?

Technically yes is possible. But the question is why will you do that?

2021-03-05 00:54:49 -0500 received badge  Rapid Responder (source)
2021-03-03 06:29:41 -0500 commented answer Robot doesn't move in Gazebo

That good. It just the way the cmd_vel works The program will store the latest cmd_vel value that it had subscribe to. H

2021-03-03 06:28:34 -0500 commented answer Robot doesn't move in Gazebo

That good. It just the way the cmd_vel works The program will store the latest cmd_vel value that it had subscribe to. H

2021-03-03 06:26:46 -0500 commented answer Robot doesn't move in Gazebo

That good. It just the way the cmd_vel works The program will store the latest cmd_vel value that it had subscribe to. H

2021-03-03 05:57:10 -0500 commented answer Robot doesn't move in Gazebo

maybe should check on ackermann_steering_controller

2021-03-03 05:54:54 -0500 commented answer Robot doesn't move in Gazebo

maybe should check on steering drive ros

2021-03-03 03:28:10 -0500 received badge  Notable Question (source)
2021-03-03 03:10:44 -0500 edited answer Robot doesn't move in Gazebo

Hard to know what your prob is. But perhaps this video will help you. https://www.youtube.com/watch?v=q01dDxeHTMs&l

2021-03-03 03:06:20 -0500 received badge  Rapid Responder (source)
2021-03-03 03:06:20 -0500 answered a question Robot doesn't move in Gazebo

Hard to know what your prob is. But perhaps this list of video will help you. https://www.youtube.com/watch?v=jmCR225OR

2021-03-03 02:56:08 -0500 commented answer How to calculate sensor_msgs/LaserScan data ?

Its in Field range. So the lidar spins 360 degree, it collects signals and place them into an array in meters. So lets

2021-03-03 02:55:26 -0500 commented answer How to calculate sensor_msgs/LaserScan data ?

Its in Field range. So the lidar spins 360 degree, it collects signals and place them into an array in meters. So lets

2021-03-03 02:54:24 -0500 commented answer How to calculate sensor_msgs/LaserScan data ?

Its in Field range. So the lidar spins 360 degree, it collects signals and place them into an array in meters. So lets

2021-03-03 02:54:11 -0500 commented answer How to calculate sensor_msgs/LaserScan data ?

Its in Field range. So the lidar spins 360 degree, it collects signals and place them into an array in meters. So lets

2021-03-03 02:53:57 -0500 commented answer How to calculate sensor_msgs/LaserScan data ?

Its in Field range. So the lidar spins 360 degree, it collects signals and place them into an array in meters. So lets

2021-03-03 02:43:02 -0500 commented answer How to calculate sensor_msgs/LaserScan data ?

In RViz you dont set the angle. The point of Lidar is spin 360 degree to generate a map, not really for detecting obstac

2021-03-03 02:42:26 -0500 commented answer How to calculate sensor_msgs/LaserScan data ?

In RViz you dont set the angle. The point of Lidar is to detect value 360 degree to generate a map, not really for detec

2021-03-02 20:05:32 -0500 edited question Anyone making a ROS SDK for Blueprint Subsea Oculus?

Anyone making a ROS SDK for Blueprint Oculus I was wondering if anyone is working on an ros SDK for Blueprint Oculus son

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2021-03-02 00:48:00 -0500 asked a question Anyone making a ROS SDK for Blueprint Subsea Oculus?

Anyone making a ROS SDK for Blueprint Oculus I was wondering if anyone is working on an ros SDK for Blueprint Oculus son

2021-02-26 00:52:54 -0500 commented question Catkin_make Errors (multipleļ¼‰

It would seems to me like your PCL library package is not properly configured in your PC. That will explain why it canno

2021-02-26 00:46:21 -0500 commented question Catkin_make Errors (multipleļ¼‰

It would seems to me like your PCL library package is not properly configured in your PC. That will explain why it canno

2021-02-25 22:51:49 -0500 answered a question How to stream gazebo camera into openCV

For me I ususlly use a "libgazebo_ros_camera.so" plugin to capture Gazebo images and publish to a Ros topic. Afterwards

2021-02-25 22:37:12 -0500 answered a question How to calculate sensor_msgs/LaserScan data ?

The Lidar's laserscan/ranges work in this way: It detects and record in terms of an array in a string of Float32. So

2021-02-25 22:18:00 -0500 received badge  Rapid Responder (source)
2021-02-25 22:18:00 -0500 answered a question How to create catkin_ws?

I did not know much about anaconda environment. But you should be able to create a ROS workspace anywhere except restric

2021-02-25 22:12:18 -0500 edited answer rostopic list works but rostopic echo does not

By default: Step 1: On the robot: 1) run Roscore 2) export ROS_IP: IP address of Robot Step 2: On your server monito

2021-02-25 22:11:45 -0500 edited answer rostopic list works but rostopic echo does not

By default: Step 1: On the robot: 1) run Roscore 2) export ROS_IP: IP address of Robot Step 2: On your server monito

2021-02-25 22:11:35 -0500 edited answer rostopic list works but rostopic echo does not

By default: Step 1: On the robot: 1) run Roscore 2) export ROS_IP: IP address of Robot Step 2: On your server monito

2021-02-25 22:10:44 -0500 answered a question rostopic list works but rostopic echo does not

By default: Step 1: On the robot: run Roscore export ROS_IP: IP address of Robot Step 2: On your server monitor PC: ex

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