Tutorial: Visualization

Visualizing with RVIZ

>$ export ROS_MASTER_URI=http://<robot_name_or_ip>:11311
>$ rosrun rviz rviz


You will need a computer with ROS installed to properly communicate with the robot. Please consult the ROS Wiki for more information. We strongly suggest an Ubuntu machine with ROS Melodic installed.

You can now manually set up your RVIZ visualization or re-run RVIZ with a configuration file using the command line. The default .rviz configuration file for Fetch can be loaded using:

>$ roscd fetch_navigation/config
>$ export ROS_MASTER_URI=http://<robot_name_or_ip>:11311
>$ rviz -d navigation.rviz

Using the Runtime Monitor

Fetch and Freight publish ROS diagnostics messages. These are human-readable messages that inform users of the robot system state. The runtime_monitor, part of rqt_robot_plugins can be used to view diagnostics from your desktop computer:

>$ export ROS_MASTER_URI=http://<robot_name_or_ip>:11311
>$ rosrun rqt_runtime_monitor rqt_runtime_monitor

The runtime monitor will have one entry per motor controller board (MCB), as well as one entry per breaker. Each of these entries will be classified as either stale, an error, a warning, or OK. In the above image, the supply_breaker is disabled because the robot is not plugged in – this is only a warning, and not actually an issue.

Common errors that can be detected are overly hot motors or breakers, breakers that have tripped. When the runstop on Fetch is pressed, a number of breakers become disabled and the motor controller boards are turned off, causing them to go stale. The below image shows what a runstopped Fetch might look like: