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2017-07-31 11:32:28 -0500 | received badge | ● Good Answer (source) |
2017-06-27 09:35:55 -0500 | commented answer | Problem using callback with multiple arguments via ApproximateTime synchronizer You can either use a message type which has a header, or create a custom message with a header and the primitive data ty |
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2015-04-24 03:20:31 -0500 | commented answer | dynamixel no motor found It does sound like your servo might be defective. Have you got another servo to test? |
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2014-12-26 15:42:49 -0500 | commented answer | Extract time from .bag file Thanks! I did not know that! I should probably delete my answer as it is inaccurate/misleading. |
2014-12-25 06:31:26 -0500 | commented answer | Extract time from .bag file Does the time refer to when rosbag received the message? |
2014-12-22 18:16:00 -0500 | commented question | Conflicts when source setup.bash Also, this question and this question are closely related to your problem. |
2014-12-22 18:07:50 -0500 | answered a question | Extract time from .bag file Message timestamps are set by their publishers and usually represent the timestamp of when the corresponding data was captured/generated. If you are referring to when The time when a subscriber receives the message depends on network latency, CPU load, as well as publisher/subscriber buffer size, and so forth. Is this helpful or have I missed your point? |
2014-12-22 17:29:02 -0500 | answered a question | Confusion over 'ssh' command for networking Regarding the command to run If you'd like to deepen your understanding of how That said, I would also advise you to export the environment variable You may also find the following two links useful: ROS/Tutorials/MultipleMachines I hope it helps. |
2014-12-08 14:18:30 -0500 | commented answer | dynamixel no motor found I have used the USB2Dynamixel and a simple USB to RS485 converter I assembled myself. They both worked fine for me... :-| |
2014-12-04 07:45:29 -0500 | answered a question | dynamixel no motor found You did not mention whether you configured the servos, so I thought it'd be worth mentioning. Each servo stores a set of parameters internally. You must configure (or at least check the configuration of) every servo separately before you attempt to communicate with them. There are 2 key parameters you must ensure are correct in order to communicate with the servos. The first parameter is the The second parameter is the Configuring the servos: You may use RoboPlus (on Windows), which is the official software from Robotis. Alternatively (if you know the parameter values currently configured), you can also change the servos IDs, as well as set the desired parameter values using these ROS nodes. Related question: ClamArm using Dynamixel Motors: No Motors Found I hope it helps! |
2014-11-19 09:14:42 -0500 | commented answer | Multiple roscores synchronize You need to run 2 nodes on each machine: |
2014-11-13 14:51:30 -0500 | answered a question | ROS application using Qt5 qml I'm not sure if you have already found a solution to your question, but... I'm not using Qt5, I'm using Qt4, but given that your error is an undefined reference, it means the linker cannot find the QtQuick library. As far as I can tell, for Qt5 and QtQuick 2, the required components/modules are QtQml and QtQuick. Would that be the issue? I hope it helps! |
2014-11-13 09:10:52 -0500 | answered a question | Multiple roscores synchronize I have been using multimaster_fkie for awhile now and it works very well with my setup. You do not necessarily need to have the machines synchronised in time, but the result will be messages published with out-of-sync timestamps. You should ensure the machines are synchronised in time, particularly if you are using TF. |
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2014-10-29 13:11:31 -0500 | answered a question | Use PTZ controls on Axis Camera The The In a nutshell, if you publish As for the dynamic reconfigure, I haven't tried that out. I hope it helps! |
2014-10-29 11:27:24 -0500 | received badge | ● Good Answer (source) |
2014-10-27 16:06:27 -0500 | commented answer | How to source only select workspaces ? You are right, there is no need to delete the |
2014-10-27 07:27:24 -0500 | received badge | ● Nice Answer (source) |
2014-10-26 16:07:17 -0500 | answered a question | How to source only select workspaces ? The behaviour your are observing has to do with how catkin workspaces are chained. At the time you created your catkin workspace, other workspaces had already been created and sourced within the shell you were using. A quick fix (if you only want to have the system-wide installed ROS packages and your catkin workspace sourced) is: Then, remember to have only one line in your See the answers (particularly the second one) to this question for a more detailed explanation on how chaining of catkin workspaces actually works. |
2014-10-26 15:46:21 -0500 | answered a question | How to convert a Hydro launch file to an indigo launch file The problem is not in your launch file. A In this case, it is the package you are trying to find in You should either install the package (if it is available), or clone the git repo in your catkin workspace. Mind you the package may not yet be compatible with ROS Indigo. |
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2014-10-07 16:35:57 -0500 | answered a question | Couldn't find executable below /home/leroy/catkin_ws/tum_ardrone There are two central concepts which you must firstly understand before attempting to do what you are doing. Firstly, you are mixing up Secondly, the source of all ROS packages compatible with See this link for further information. I hope it helps! |
2014-10-07 16:30:49 -0500 | answered a question | Couldn't find executable below /home/leroy/catkin_ws/tum_ardrone There are two main concepts which you must understand better. Firstly, you are mixing up |
2014-09-25 11:09:58 -0500 | answered a question | moving mobile robot in zigzag way You are publishing four different velocity commands (roughly) every 20 milliseconds (50 Hz), and hence the robot will never actually do what you are expecting. Revise your logic and make sure you send the same velocity command for a given period of time long enough the robot has time to move, then switch to the next velocity command... and so on and so forth... |
2014-09-24 16:56:03 -0500 | commented answer | setting a param from the launch file doesn't work with string Just to complement, adding |
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2014-09-02 17:00:07 -0500 | commented answer | Question concerning the movement of a 6DOF + frames I edited my answer and added an example of how I use the package. You just need to add that to your launch file. |
2014-09-02 16:29:33 -0500 | answered a question | librviz display sensor_msgs/LaserScan The same way you created your For instance, to add a Then, in your source file, you should do something like: You can add the display in RViz and check which settings/properties you would be able to change there. Then just adapt the lines of code above to set the properties you want. The same idea works for any other display type you can add in RViz. |
2014-08-28 09:14:58 -0500 | commented question | obtaining Kinect registered images (X,Y and depth) Assuming you are running Hydro or Indigo, have you checked the documentation? There you can see which topic publishes depth images, registered or not, in metres or millimetres. It might be a good starting point. |
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2014-08-27 16:57:02 -0500 | answered a question | Question concerning the movement of a 6DOF + frames Adding to what @tfoote said, my workaround to the fact that After implementing it myself, I found out there is a package called hector_imu_attitude_to_tf, which does exactly that. This way, when I set the fixed frame in RViz to EDIT: Below is an example of how I used the |
2014-08-26 18:29:50 -0500 | commented question | rosservice call syncing service starts Focussing on your question, how about creating another service which takes as |
2014-08-26 13:51:32 -0500 | commented answer | How to subsribe to a ROS topic for several seperate times? That's because you should not use |
2014-08-26 12:03:27 -0500 | edited answer | How to subsribe to a ROS topic for several seperate times? EDIT: I tested and, with some changes, it works. As long as you make Also, you do not need the Originally, I had written: My suggestion is untested and I might be wrong, but how about having your If you want to wait for a certain time at each iteration, then you could: Do not use Someone else might be able to provide you with a better alternative. I hope it helps anyway. |
2014-08-26 11:34:06 -0500 | commented answer | Can anyone share me "roscpp_tutorials/TwoInts.h" As for the error in Eclipse, make sure you configured the package according to this documentation. |
2014-08-26 11:32:56 -0500 | commented answer | Can anyone share me "roscpp_tutorials/TwoInts.h" Oh, OK. If you are following that and compiling the package named |
2014-08-26 08:37:32 -0500 | commented question | SICK LMS1xx in Husky (Hydro) I'm also using a Husky with LMS100 on 12.04 + Hydro. I forked the repo from clearpath and made very minor changes. Have you checked the IP configured on the LMS? Can you show your launch file? |
2014-08-26 08:21:54 -0500 | answered a question | Can anyone share me "roscpp_tutorials/TwoInts.h" The file you are looking for is automatically generated by the The fact that you are not aware of that suggests you should follow the ROS Tutorials, particularly tutorial 10, which explains how to create and use ROS message and service files. Then, tutorials 14 and 16 further explain the underlying concepts. I strongly advise you follow the ROS Tutorials (or one of those recently published books about ROS, if you fancy) if you are starting to learn ROS! :-) |