Difference between revisions of "Jetbot ROS"
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(→Use The Keyboard To Control Jetbot Movement) |
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</pre> | </pre> | ||
| − | == Create | + | == Create The Catkin Workspace == |
Create a ROS Catkin workspace to contain our ROS packages. | Create a ROS Catkin workspace to contain our ROS packages. | ||
| Line 64: | Line 64: | ||
</pre> | </pre> | ||
| − | == Install | + | == Install Jetbot Ros == |
Clone and build the jetbot_ros repo. | Clone and build the jetbot_ros repo. | ||
| Line 102: | Line 102: | ||
|} | |} | ||
| − | ''' Running the | + | ''' Running the motors ''' |
Open a new terminal, and start the jetbot_motors node. | Open a new terminal, and start the jetbot_motors node. | ||
| Line 122: | Line 122: | ||
|} | |} | ||
| − | ''' Using the | + | ''' Using the debug OLED ''' |
If you have an SSD1306 debug OLED on your JetBot, you can run the jetbot_oled node to display system information and user-defined text. | If you have an SSD1306 debug OLED on your JetBot, you can run the jetbot_oled node to display system information and user-defined text. | ||
| Line 138: | Line 138: | ||
|} | |} | ||
| − | == Use the keyboard to control jetbot movement | + | == Remote Control Jetbot == |
| + | |||
| + | ''' Use the keyboard to control jetbot movement ''' | ||
Open a new terminal to run teleop_key node.After the program is running, input W, S, D, A four keys on the keyboard to control the jetbot to move forward, backward, right, and left. | Open a new terminal to run teleop_key node.After the program is running, input W, S, D, A four keys on the keyboard to control the jetbot to move forward, backward, right, and left. | ||
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|} | |} | ||
| − | == Create | + | == Create Lidar Scan Node == |
Let’s create a package. | Let’s create a package. | ||
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</pre> | </pre> | ||
| − | == Install | + | == Install Rviz == |
Install rviz by entering the following commands in the terminal. | Install rviz by entering the following commands in the terminal. | ||
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</pre> | </pre> | ||
| − | Check the ttyusb0, it's | + | Check the ttyusb0, it's rplidar work. |
{| border="1" cellpadding="1" style="width:300px;" | {| border="1" cellpadding="1" style="width:300px;" | ||
| Line 250: | Line 252: | ||
$ catkin_make | $ catkin_make | ||
</pre> | </pre> | ||
| + | |||
| + | Preview the point cloud. | ||
| + | |||
| + | <pre>$ roslaunch rplidar_ros view_rplidar.launch | ||
| + | </pre> | ||
| + | |||
| + | {| border="1" cellpadding="1" style="width:300px;" | ||
| + | |- | ||
| + | | style="width: 389px; background-color: rgb(80, 80, 80); color: rgb(255, 255, 255); text-align: center;" | Point cloud | ||
| + | |- | ||
| + | | style="text-align: center;" | [[File:Point cloud.png|300px|thumb|center]] | ||
| + | |} | ||
| + | |||
| + | Clone and build the hector_slam repo. | ||
| + | |||
| + | <pre>$ cd ~/catkin_ws/src | ||
| + | $ git clone https://github.com/tu-darmstadt-ros-pkg/hector_slam | ||
| + | $ cd ~/catkin_ws | ||
| + | $ catkin_make | ||
| + | </pre> | ||
| + | |||
| + | Preview the SLAM. | ||
| + | |||
| + | <pre>$ roslaunch rplidar_ros view_slam.launch | ||
| + | </pre> | ||
| + | |||
| + | {| border="1" cellpadding="1" style="width:300px;" | ||
| + | |- | ||
| + | | style="width: 389px; background-color: rgb(80, 80, 80); color: rgb(255, 255, 255); text-align: center;" | SLAM | ||
| + | |- | ||
| + | | style="text-align: center;" | [[File:SLAM.png|300px|thumb|center]] | ||
| + | |} | ||
Latest revision as of 10:41, 23 November 2022
Contents
Linux Version
JetPack 4.5.1 / Ubuntu 18.04
Use: jetson-nx-jp451-sd-card-image
Note: the process below will likely exceed the disk capacity of a 16GB filesystem,so a larger SD card should be used. ( Advice more than 64GB )
Install ROS
Install ROS melodic
# enable all Ubuntu packages: $ sudo apt-add-repository universe $ sudo apt-add-repository multiverse $ sudo apt-add-repository restricted # add ROS repository to apt sources $ sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list' $ sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654 # install ROS Base $ sudo apt-get update $ sudo apt-get install ros-melodic-ros-base # add ROS paths to environment $ sudo sh -c 'echo "source /opt/ros/melodic/setup.bash" >> ~/.bashrc'
Close and restart the terminal.
Install python and adafruit libraries
# pip should be installed $ sudo apt-get install python-pip # install Adafruit libraries $ pip install Adafruit-MotorHAT $ pip install Adafruit-SSD1306
Add i2c too user
$ sudo usermod -aG i2c $USER
Create The Catkin Workspace
Create a ROS Catkin workspace to contain our ROS packages.
# create the catkin workspace $ mkdir -p ~/workspace/catkin_ws/src $ cd ~/workspace/catkin_ws $ catkin_make # add catkin_ws path to bashrc $ sudo sh -c 'echo "source ~/workspace/catkin_ws/devel/setup.bash" >> ~/.bashrc'
Close and open a new terminal window. Verify that your catkin_ws is visible to ROS.
$ echo $ROS_PACKAGE_PATH /home/nvidia/workspace/catkin_ws/src:/opt/ros/melodic/share
Install Jetbot Ros
Clone and build the jetbot_ros repo.
# git and cmake should be installed $ sudo apt-get install git cmake # clone the repo $ cd ~/workspace/catkin_ws/src $ git clone https://github.com/waveshare/jetbot_ros # build the package $ cd ../ # cd ~/workspace/catkin_ws $ catkin_make # confirm that jetbot_ros package can be found $ rospack find jetbot_ros /home/nvidia/workspace/catkin_ws/src/jetbot_ros
Test Jetbot
Running the ROS master
Next, let's check that the different components of the robot are working under ROS.
First open a new terminal, and start roscore.
$ roscore
| Roscore |
Running the motors
Open a new terminal, and start the jetbot_motors node.
$ rosrun jetbot_ros jetbot_motors.py
Open a new terminal, and check jetbot_motors node is open.
$ rosnode list $ rostopic list
| Rosnode list |
Using the debug OLED
If you have an SSD1306 debug OLED on your JetBot, you can run the jetbot_oled node to display system information and user-defined text.
$ rosrun jetbot_ros jetbot_oled.py
By default, jetbot_oled will refresh the display every second with the latest memory usage, disk space, and IP addresses.
| OLED print |
Remote Control Jetbot
Use the keyboard to control jetbot movement
Open a new terminal to run teleop_key node.After the program is running, input W, S, D, A four keys on the keyboard to control the jetbot to move forward, backward, right, and left.
$ rosrun jetbot_ros teleop_key.py
Can see the running action from the jetbot_motors node terminal.
| Motors node |
Create Lidar Scan Node
Let’s create a package.
$ cd ~/catkin_ws/src $ catkin_create_pkg laser_values rospy $ cd laser_values $ mkdir launch
Add a python script under src with the following code.
import rospy
from sensor_msgs.msg import LaserScan
def callback(msg):
print len(msg.ranges)
def callback(msg):
# values at 0 degree
print msg.ranges[0]
rospy.init_node('scan_values')
sub = rospy.Subscriber('/scan', LaserScan, callback)
rospy.spin()
Then create a launch file under lunch directory to launch the script.
<launch>
<node pkg="laser_values" type="scan.py" name="scan_values" output="screen">
</node>
</launch>
First open a new terminal, and start roscore.
$ roscore
Open a new terminal, and start the laser.launch node.
$ roslaunch laser_values laser.launch
Install Rviz
Install rviz by entering the following commands in the terminal.
$ sudo apt update $ sudo apt install rviz
First open a new terminal, and start roscore.
$ roscore
Open a new terminal, and start the rviz node.
$ rosrun rviz rviz
Install RP Lidar SDK
First install rplidar sdk.
$ cd rplidar_sdk_v1.X.X/sdk/sdk/ $ make $ ls /dev/ttyUSB*
Check the ttyusb0, it's rplidar work.
| ttyuUSB0 |
Setting com port permission.
$ sudo chmod 666 /dev/ttyUSB0
Jetbot SLAM
Clone and build the rplidar_ros repo.
$ cd ~/catkin_ws/src $ git clone -b slam https://github.com/robopeak/rplidar_ros $ cd ~/catkin_ws $ catkin_make
Preview the point cloud.
$ roslaunch rplidar_ros view_rplidar.launch
| Point cloud |
Clone and build the hector_slam repo.
$ cd ~/catkin_ws/src $ git clone https://github.com/tu-darmstadt-ros-pkg/hector_slam $ cd ~/catkin_ws $ catkin_make
Preview the SLAM.
$ roslaunch rplidar_ros view_slam.launch
| SLAM |
