ROS Resources: Documentation | Support | Discussion Forum | Index | Service Status | ros @ Robotics Stack Exchange |
2020-02-07 07:19:12 -0500 | received badge | ● Famous Question (source) |
2020-02-07 07:19:12 -0500 | received badge | ● Notable Question (source) |
2019-09-24 04:16:53 -0500 | received badge | ● Nice Answer (source) |
2019-04-04 08:29:57 -0500 | received badge | ● Famous Question (source) |
2018-04-30 13:30:52 -0500 | received badge | ● Famous Question (source) |
2018-02-21 03:06:49 -0500 | received badge | ● Famous Question (source) |
2017-07-24 08:34:32 -0500 | received badge | ● Notable Question (source) |
2017-07-24 08:34:32 -0500 | received badge | ● Popular Question (source) |
2017-04-02 22:49:06 -0500 | received badge | ● Enlightened (source) |
2017-04-02 22:49:06 -0500 | received badge | ● Good Answer (source) |
2017-02-22 14:35:24 -0500 | received badge | ● Famous Question (source) |
2017-02-12 02:57:57 -0500 | received badge | ● Notable Question (source) |
2017-02-12 02:57:57 -0500 | received badge | ● Popular Question (source) |
2017-02-01 07:32:03 -0500 | commented answer | Arduino /cmd_vel and /odom with Pololu motors w/ encoder Haha recommending rosserial is totally fine, I just don't want to be linked to the tutorials. I will write a node on the Arduino that will listen to the /cmd_vel topic and write the PWM value to the motors. I hope you can give feedback after I post the code as an edit in the original question. |
2017-02-01 07:25:40 -0500 | received badge | ● Notable Question (source) |
2017-02-01 03:42:19 -0500 | received badge | ● Popular Question (source) |
2017-01-31 16:11:14 -0500 | received badge | ● Critic (source) |
2017-01-31 16:02:41 -0500 | received badge | ● Notable Question (source) |
2017-01-31 16:02:41 -0500 | received badge | ● Popular Question (source) |
2017-01-31 15:59:42 -0500 | asked a question | Arduino /cmd_vel and /odom with Pololu motors w/ encoder Hi guys, I have been struggling with my robot for 3-4 days now. I want to publish to the /cmd_vel topic and then to the /odom topic using the Arduino MEGA connected to 4 Pololu motors with encoders. I have installed rosserial and gone through the tutorials, I have tried modifying ros_arduino_bridge to fit my hardware with no success, so please do not suggest these as solutions :) I have also tried getting the ticks from the motors with a mild success, but nothing useful. I have tested all motors by sending a variety of PWM signals from the MEGA and they seem to function just fine. Is it even possible with the motor controllers I am using? I am honestly hoping someone can direct me in the right direction. Everything online is just people linking to the rosserial tutorial page.. My robot is a 4WD platform with
A schematic showing the pinouts of the DC Motor Driver Carrier from the Pololu page |
2016-07-07 10:15:21 -0500 | commented question | Converting the remaining part of a catkin cmakelist to rosbuild Using the work from an article presented at ICRA2015 - github repo here https://github.com/angusleigh/leg_tra... |
2016-07-07 08:16:41 -0500 | asked a question | Converting the remaining part of a catkin cmakelist to rosbuild Hi have tried to convert this catkinized cmakelist to rosbuild but without success. I'm running ROS Fuerte. Here is the original: I've reduced the file down to this And the package.xml has been renamed to manifest.xml and changed accordingly. Here is the original package.xml: Which I've reduced and commented out the message_generation and libfftw3 since running a rosmake couldn't find these packages: (more) |
2016-06-24 04:20:00 -0500 | asked a question | Calculating incident angle of laserscan and laserpoints 2D Hi guys, I'm trying to calculate the angle of incident between a laserscan and laserscanner points. I'm having trouble calculating the normal of the surface from neighbouring points before actually calculating angle of incidence. Here's a figure of what I'm trying to accomplish (the laserscanner is at the corner of the robot). I'm trying to find alpha1 and alpha2 To calculate the normal vector for each point I've tried using PCL, but the values are just (0,0,-1) for all points. I suspect this is because the pcl function expects a 3D pointcloud and I'm actually parsing a 2D pointcloud. I've used the code directly from the pcl documentation: If there's an easier way to calcuate the normal for each point please let me know. Thank you! |
2016-06-16 05:25:10 -0500 | commented question | What does "use_tf_scan_transform" parameter in Hector slam represent? I think you are right about "use_tf_scan_transformation, see this answer to a similar question: http://answers.ros.org/question/48778... |
2016-06-15 05:09:27 -0500 | received badge | ● Popular Question (source) |
2016-06-11 03:27:46 -0500 | commented question | How to plot laser scan data into Matlab ? That's a python error. You should indent your python code properly. You can paste the full script here and I can check the indents if necessary, but try correcting them yourself first. |
2016-06-09 06:07:38 -0500 | commented question | How to plot laser scan data into Matlab ? Have you tried msg.min... etc? |
2016-06-09 03:59:52 -0500 | commented question | How to plot laser scan data into Matlab ? Try running a rostopic list to see if your laser scans are published (they probably are). Then you can start by changing the '/odom/ to the laser topic. |
2016-06-07 17:19:56 -0500 | commented answer | joint_state_publisher gui unresponsive My bad, still learning to use rqt_graph :) here it is |
2016-06-07 14:41:30 -0500 | commented answer | joint_state_publisher gui unresponsive I know that the joint_state_publisher isn't meant for 'controlling a robot'. I'm writing a walkthrough for a friend of mine so we can build a robot together. The reason I asked was because I suspect that Kinetic distro might have something to do with it. node graph. |
2016-06-07 14:27:09 -0500 | commented question | joint_state_publisher gui unresponsive Thank you will remember that for future questions. |
2016-06-06 14:34:07 -0500 | asked a question | joint_state_publisher gui unresponsive I have this problem when I'm trying to move the sliders it is near impossible to move them anywhere, the gif below probably doesn't display so here's the imgur link to an example of a non responsive joint_state_publisher gui This is on Kinetic, Xenial 16.04. Can anyone explain why and help me resolve this? I'm considering just creating a gui with rqt or just control it through a script if I can't resolve the above :) |
2016-06-06 02:52:51 -0500 | received badge | ● Nice Answer (source) |
2016-06-03 13:03:06 -0500 | received badge | ● Commentator |
2016-06-03 13:03:06 -0500 | commented question | When will rosbag::Player be released? You could create an issue on their github page. Even if they respond with a 'no' it will be nice for them to know the comment is there and remove it accordingly. |
2016-06-03 12:50:00 -0500 | answered a question | problems in hector slam I've used Hector SLAM a lot myself and all of your issues are common issues with Hector SLAM. It is important to remember what environment(video) TeamHectorDarmstadt used the robot in. The particular environment is rich in features and there are literally no long corridors, so for them, the Hector SLAM mapping and navigation algorithms were perfect. Now using the algorithm in areas with great laser ambiguity that's another story. I'm going to try and give a short explanation to each .. question? And give you a couple of ideas to code a solution.
There are different things you can do to make HSLAM more robust one is loop closure and another is this Modeling Laser Intensities For Simultaneous Localization and Mapping awesome method which would be really cool to implement! Hope this is useful, if all fails you could look in to mapping with vision based systems like LSD-SLAM, ORB-SLAM, RTAB etc. |
2016-06-03 12:29:27 -0500 | commented question | How to use urdf_to_graphiz command to see the link relationships of my xacro models? What distro are you running? Try |
2016-06-03 12:27:16 -0500 | commented answer | I cannot find beginner_tutorials Also your path environment might not be setup correctly, can you write the output of ' echo $ROS_PACKAGE_PATH ' ? Without the hyphens |
2016-06-03 12:24:18 -0500 | answered a question | E: Unable to locate package ros-kinetic-desktop-full "E: Unable to locate package ors-kinetic-desktop-full", didn't you just mistype 'ros'? |