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2016-04-19 11:30:51 -0500 | marked best answer | odometry for ardrone Hello everyone. I started programming the ardrone using ROS (I'm a newbie to both) and i wanted to implement a basic form of odometry of the kind px = px + (vxcos(...) - vysin(...)), py = ..., using the speed information provided from the navdata. Unfortunately, in this way a lot of error is introduced. Since i've never used ROS, i wanted to know if there is a better way to do this, i mean, if ROS offers a way to keep track of the position of the drone. Thank you in advance. |
2016-03-17 13:53:42 -0500 | marked best answer | error while loading shared libraries ardrone Hello everyone. I needed to pass to Ubuntu 64 bit in order not to have problems with the package ar_track_alvar. I was working with the ardrone_autonomy package, which did work fine until i was on 32 bit. Now, when i launch the node, i get the following error: fuerte_workspace/ardrone_autonomy/bin/ardrone_driver: error while loading shared libraries: libimage_transport.so: wrong ELF class: ELFCLASS64 and the process dies. Any idea to how to fix this? Thanks in advance! |
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2014-10-29 13:38:15 -0500 | marked best answer | multiple ar.drones on tum_simulator Hello everyone. I've been trying to make the ros-gazebo simulator working with 2 or more drones, with no result. Using rostopic list, the topics appear with the right name (/ardrone/takeoff and /ardrone_2/takeoff etc.) but when I send a command, only one drones is receiving them, often with unexpected outcomes (it flies away =( )) Here is my launch file, while the spawn_quadrotor_classic launch file is, Any help would be appreciated! Thank you! |
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2014-05-07 14:05:52 -0500 | answered a question | multiple ar.drones on tum_simulator I contacted the developer some time ago. He said that the simulator is structured in such a way that allows the spawning of only a single robot at each time. |
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2014-01-28 17:30:18 -0500 | marked best answer | problem with distributed ROS (swarm of ardrones) Hello everyone. I'm having issues with the control of 3 ardrones, each one connected to its laptop, where one of these laptos is configured as the master. The network is configured properly. The first problem occured with 2 drones. When flying togheter, I kept getting the following error "Reconnecting ... Reconnecting ... Timeout when reading navdatas - resending a navdata request on port 5554" So I firstly switched from the 200 hz of the navdata msgs sent from the drone to 15 hz, and I set the drone driver loop from 50 to 20. The two drones where then able to fly togheter. When I added the third, unfortunately, the error reappeared. In my nodes I write on a custom topic the informations relative to each drone (I send them each 300 ms), I have 2 loops repeating at 200 and 100 ms, and on each laptop two nodes for marker detection (ar_track_alvar package) Does anyone have an idea of how to make the system work robustly with 3 drones? Thank you! |
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2013-12-31 23:09:13 -0500 | marked best answer | tutorials for ar_pose Hello everyone. I was looking for a good tutorial to learn how to use ar_pose. Thank you in advance! |
2013-11-03 22:19:41 -0500 | asked a question | Not more than 2 parrot ardrone simultaneously? Hello everyone. I followed the instructions at https://github.com/AutonomyLab/ardrone_autonomy/wiki/Multiple-AR-Drones for using multiple parrots. With 2 robots, the network works fine. However, when I add the third, after a while, I get the following error: Timeout when reading navdatas - resending a navdata request on port 5554 and the network is not able to recover. This happens also if I set the "codec_fps" parameter to 1. Does anyone know if it is possible to solve this issue? Thank you. |
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2013-05-28 21:30:54 -0500 | asked a question | problem with mesh orientation in rviz Hello everyone. I want to display a marker in rviz with the shape of a person. I found a .dae model on the web. I send the marker information trough the proper topic and I am able to visualize the mesh model in rviz. The problem is that, when I use some keyboard command to make the model rotate, it does not. It is strange because I am displaying other robots as "marker" and they receive the orientation (obviously the code I am using is the same). I've never created a .dae model and looking into the file I cannot figure out what is wrong =( Any expert? Otherwise, can someone tell me where I can find mesh models of a "person" (even a humanoid robot is ok) that can work in rviz? Thank you. |
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2013-05-23 21:54:37 -0500 | answered a question | avoidin circular topic remapping Thank you very much! |
2013-05-23 08:33:17 -0500 | asked a question | avoidin circular topic remapping Hello. I've got a problem with topic remapping. I have a node that publishes informations relative to a robot, and listens to the topics of the informations relative to other 3 robot of the same type. Something like: publish on : /robot1/info listens to: /robot2/info , /robot3/info, /robot4/info. Now I want all the 4 robots to share the same code. So, I want, for example, robot2 to publish on /robot2/info and to listen to /robot1/info (and to the other 2 robots of course) In the launch file a used a classic remap in this way: from="/robot1/info" to="/robot2/info" and from="/robot2/info" to="/robot1/info" but the result is that nothing changes and I think is due to some kind of circular remapping. Any idea of how to address the problem? Thank you in advance. |