lochlomond's profile - activity

For example, I just changed the launch file from

<include file="$(find husky_gazebo)/launch/spawn_husky.launch">
    <arg name="laser_enabled" value="true"/>
</include

into

<include file="$(find husky_gazebo)/launch/spawn_husky.launch">
    <rosparam command="load" file="$(find husky_highlevel_controller)/config/laser_enable_param.yaml"/>
</include

the yaml is only one line:

laser_enabled: true

Then it turns out that the parameter fails to be loaded. May someone tell me which part is not right? Thank you. then the parameter

It seems to me that what ros provides us to control a robot is the expected velocity /cmd_vel, but from this signal to real force/torque applied to the robot, there must be a controller there. Can someone tell me in which file I can see this controller? Thanks.

Actually, I'm not dealing with hardware yet. I mean the pure simulation. e.g. the husky simulator, the /cmd_vel finally goes to the gazebo husky model, and the gazebo model returns the effect of the control. in the rqt_graph i can see the there is a controller between the /cmd_vel and gazebo, but i just cannot find the file which describes it.

When I controll the husky simulator, the motion of husky is driven by the /husky_velocity_controller/cmd_vel, I send a cmd_vel topic as expected velocity, the robot moves. But from physics, we know there must be a controller that transform the cmd_vel signal into the force that drives the vehicle. Where can I find the implementation of this controller? in which file? Thanks.

isn't it just a choice of which to pass through?

Thank you. this link just relates to config files, where is the explicit implementation?

i met the same problem, here is how i "solved" it, ugly but worked write "import cv2" into import sys sys.path.remove('

sorry, i did not state the question clear enough. I updated it.

where is the controller from /cmd_vel to the force applied to robot? It seems to me that what ros provides us to control

which file implements the husky_velocity_controller? When I controll the husky simulator, the motion of husky is driven

where is the controller from /cmd_vel to the force applied to robot? It seems to me that what ros provides us to control

Thanks, this really helps.

but, the coordinate is only the relative position wrt the vehicle?

I just want to put the "true" in this line <arg name="laser_enabled" value="true"/> in to a yaml file, and read t

Cannot read parameters from file in launch file For example, I just changed the launch file from <include file="$(fi

Cannot read parameters from file in launch file For example, I just changed the launch file from <include file="$(fi

the cmakelist tutorial in wiki.ros for publisher/subscriber is not right http://wiki.ros.org/ROS/Tutorials/WritingPublis

you are not the only one who think so. I think the exercise itself does not make it very clear enough. do you see the se

Sorry, I havn't got an answer yet. I was saying I am trying to solve it, but got stuck at this point. I said possible be

Sorry, I havn't got an answer yet. I was saying I am trying to solve it, but got stuck at this point.

thanks, this really helps.

I kind of like this one: https://www.youtube.com/watch?v=lR3cK9ZoAF8 Hope this may help

It is possible. See the tutorial example here: http://wiki.ros.org/ROS/Tutorials/Roslaunch%20tips%20for%20larger%20proje

Thank you. But why can the argument of a function not take value from global variables? And what should I do if I want t

Cannot read parameters from file in launch file For example, I just changed the launch file from <include file="$(fin