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OK, let's see. To start with 1 and 3 are completely overlapping. You use a launch file to start multiple nodes at the same time.

To set up the catkin workspace follow this tutorial

What nav demo are you using? There is one specifically for the husky here. You may need to change the ROS distro though (this is for indigo, I don't know what version you are using).

Once you have that working you can write your own node to send a goal to the move_base action server in order to get it to navigate to a specified point.

OK, let's see. To start with 1 and 3 are completely overlapping. You use a launch file to start multiple nodes at the same time.

To set up the catkin workspace follow this tutorial

What nav demo are you using? There is one specifically for the husky here. You may need to change the ROS distro though (this is for indigo, I don't know what version you are using).

Once you have that working you can write your own node to send a goal to the move_base action server in order to get it to navigate to a specified point.

[EDIT]

To run a physical Husky, in a terminal window run roslaunch husky_base base.launch. You should also take a look at the husky_bringup package. It has launch files for optional hardware on the Husky such as the CH Robotics UM6 IMU and LMS100 laser range finder.