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stretch_tutorials/moveit_basics.md

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MoveIt! Basics

MoveIt! on Stretch

To run MoveIt with the actual hardware, (assuming stretch_driver is already running) simply run

roslaunch stretch_moveit_config move_group.launch

This will runs all of the planning capabilities, but without the setup, simulation and interface that the above demo provides. In order to create plans for the robot with the same interface as the offline demo, you can run

roslaunch stretch_moveit_config moveit_rviz.launch

MoveIt! Without Hardware

To begin running MoveIt! on stretch, run the demo launch file. This doesn't require any simulator or robot to run.

roslaunch stretch_moveit_config demo.launch

This will brining up an RViz instance where you can move the robot around using interactive markers and create plans between poses. You can reference the bottom gif as a guide to plan and execute motion.

image

Additionally, the demo allows a user to select from the three groups, stretch_arm, stretch_gripper, stretch_head to move. The option to change groups in the in Planning Request section in the Displays tree. A few notes to be kept in mind:

  • Pre-defined start and goal states can be specified in Start State and Goal State drop downs in Planning tab of Motion Planning RViz plugin.

  • stretch_gripper group does not show markers, and is intended to be controlled via the joints tab that is located in the very right of Motion Planning Rviz plugin.

  • When planning with stretch_head group make sure you select Approx IK Solutions in Planning tab of Motion Planning RViz plugin.

image

Running Gazebo with MoveIt! and Stretch

# Terminal 1:
roslaunch stretch_gazebo gazebo.launch
# Terminal 2:
roslaunch stretch_gazebo teleop_keyboard.launch # or use teleop_joy.launch if you have a controller
# Terminal 3
roslaunch stretch_moveit_config demo_gazebo.launch

This will launch an Rviz instance that visualizes the joints with markers and an empty world in Gazebo with Stretch and load all the controllers. There are pre-defined positions for each joint group for demonstration purposes. There are three joint groups, namely stretch_arm, stretch_gripper and stretch_head that can be controlled individually via Motion Planning Rviz plugin. Start and goal positions for joints can be selected similar to this moveit tutorial.

image