ROS2 and Gazebo: Localization and Path Planning

Tutorials

ROS2 and Gazebo

Differential Drive Robot

ROS2 Navigation: Basics

Robot Setup

Navigation: Sensors

Mapping and Localization

Costmap 2D

Navigation: Improved project

We use ROS2 Galactic now!

Making sure Gazebo and RViz are closed

Navigation: Examples

Multiple Robots

Custom Nav Algorithms

Building 2.5d world

Navigation in 2.5D world

Robotic Arm

Software: AI Related

Robotics: DIY

Contact

We use different mode values (simple - slam - map) and accordingly, different RViz config files. Alltogether, it creates kind of a mess, but the logic is simple.

                    # Terminal 1
                    # echo $ROS_DISTRO
                    # galactic
                    #
                    # source /opt/ros/galactic/setup.bash
                    #
                    $ cd ~/SnowCron/ros_projects/harsh
                    $ colcon build --packages-select multi_bot_nav_01
                    $ source install/setup.bash

# To run a single robot without SLAM or Map (robot name in code is set to ""): $ ros2 launch multi_bot_nav_01 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:=src/maps/map.yaml keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_nav_01/rviz/simple_single.rviz mode:=simple

# To run a single robot simulation (SLAM) (robot name set to ""): $ ros2 launch multi_bot_nav_01 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:=src/maps/map.yaml keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_nav_01/rviz/slam_single.rviz mode:=slam

# To run a single robot simulation (Map) (robot name set to ""): $ ros2 launch multi_bot_nav_01 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:=src/maps/map.yaml keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_nav_01/rviz/map_single.rviz mode:=map

# To run a multi robot without SLAM or Map (robot name set to robot1, robot2). Do not # forget to uncomment code for multiple robots in the launch file, and to comment out # the code for a single robot with empty namespace: $ ros2 launch multi_bot_nav_01 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:=src/maps/map.yaml keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_nav_01/rviz/simple_multi.rviz mode:=simple

# To run a multi robot simulation (SLAM): $ ros2 launch multi_bot_nav_01 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:='src/maps/map.yaml' keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_nav_01/rviz/slam_multi.rviz mode:=slam

# To run a multi robot simulation (Map): $ ros2 launch multi_bot_nav_01 multi_simulation_launch.py world:=src/worlds/maze_with_charger.sdf map:='src/maps/map.yaml' keepout_mask:=src/maps/keepout_mask.yaml rviz_config_file:=src/multi_bot_nav_01/rviz/map_multi.rviz mode:=map

To control robots manually:

# Terminal 2 $ cd ~/SnowCron/ros_projects/harsh $ source install/setup.bash # To move a single robot # Single command: $ ros2 topic pub cmd_vel geometry_msgs/msg/Twist '{linear: {x: 0.5, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.0}}' # Teleop tool: $ ros2 run teleop_twist_keyboard teleop_twist_keyboard # to move the robot in multi-robot launch, use one of the following # (you can use them simultaneously): $ ros2 topic pub /robot1/cmd_vel geometry_msgs/msg/Twist '{linear: {x: 0.5, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.0}}' $ ros2 topic pub /robot2/cmd_vel geometry_msgs/msg/Twist '{linear: {x: 0.5, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.0}}' $ ros2 run teleop_twist_keyboard teleop_twist_keyboard --remap cmd_vel:=/robot1/cmd_vel $ ros2 run teleop_twist_keyboard teleop_twist_keyboard --remap cmd_vel:=/robot2/cmd_vel

Waypoints following and Docking to charger

These are for backward compatibility: we have our custom path planning and following, but Nav2 still works.

To run these scripts, Terminal 1 should have our launch file started with "mode" equal "map", either for single robot configuration (robot name set to "") or in multi robot configuration. Just to remind you: it can be changed by commenting / uncommenting the following lines in multi_simulation_launch.py:

robots = [ {'name': '', 'x_pos': 0.0, 'y_pos': 0.5, 'z_pos': 0.01, "color_name" : "Green", "color_rgb" : "0 1 0 1"}, # {'name': 'robot1', 'x_pos': 0.0, 'y_pos': 0.5, 'z_pos': 0.01, # "color_name" : 'Yellow', "color_rgb" : "1 1 0 1"}, # {'name': 'robot2', 'x_pos': 0.0, 'y_pos': -0.5, 'z_pos': 0.01, # "color_name" : 'Blue', "color_rgb" : "0 0 1 1"}, ]

To run simple waypoint follower script for a single robot (robot name is ""):

                    # Terminal 3:
                    $ cd ~/SnowCron/ros_projects/harsh/src/multi_bot_nav_01/multi_bot_nav_01
                    $ python3 01_waypoint_follower.py

To run docker charging script for a single robot (robot name is ""):

                    # Terminal 3:
                    $ cd ~/SnowCron/ros_projects/harsh/src/multi_bot_nav_01/multi_bot_nav_01
                    $ python3 03_charger_docking.py

Finally, to run docker charging script on multiple (2) robots:

                    # Terminal 3:
                    $ cd ~/SnowCron/ros_projects/harsh/src/multi_bot_nav_01/multi_bot_nav_01
                    $ python3 04_charger_docking_obstacles_multi.py

Custom path planning and following

Same as earlier: to run these scripts, Terminal 1 should have our launch file started with "mode" equal "map", either for single robot configuration (robot name set to "") or in multi robot configuration. Just to remind you: it can be changed by commenting / uncommenting the following lines in multi_simulation_launch.py:

To run path custom path planning and following with a single robot (robot name is ""):

                    # Terminal 3:
                    $ cd ~/SnowCron/ros_projects/harsh/src/multi_bot_nav_01/multi_bot_nav_01
                    $ source install/setup.bash
                    $ python3 Coordinator.py

To run path custom path planning and following with a multiple robots:

                    # Terminal 3:
                    $ cd ~/SnowCron/ros_projects/harsh/src/multi_bot_nav_01/multi_bot_nav_01
                    $ source install/setup.bash
                    $ python3 Coordinator.py

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