Installing a Jetson TX2¶

Start by opening up the Jackal to reveal the computer tray. Use the lever on the front of the Jackal then the thumb screws on the lid. For more instructions refer to the Jackal User’s Manual.

Step 1: Remove mini-ITX Computer¶

(Skip this step if you don’t have a computer)

If you have a mini-ITX computer installed it will need to be removed. With the computer tray open locate each of the cables connected to the motherboard and harddrive. Remove the power, power switch, USB and SATA cables. The two cable ties can be cut to completely remove the power and SATA cables. The two antenna cables are connected underneath. Keep this in mind for the next steps.

Remove the four (4) hex screws from the motherboard using a 2.5mm wrench. Gently lift it out disconnecting the antenna connectors as you do so.

Remove the zipties holding the USB header, power switch signal and antenna wire. The Jetson TX2 doesn’t have a USB header so it will have to be replaced with a USB mini cable. You will need extra slack in both the antenna cable and power switch signal as well.

Remove the SSD from the outside of the computer tray.

Step 2: Install the TX2¶

Install the Jetson TX2 using M3 screws or the screws removed from the computer. The holes will only line up in one orientation. Plug a USB mini cable from the Jetson to the Jackal MCU board.

This is beside where the USB header was removed if you had a computer. We recommend using a USB hub to increase the number of connected devices. Plug the power switch cable into the power switch header (J6). If you wish to use the antenna cables attached to the Jackal remove the U.FL connectors from the Jetson module and connect the antenna cables. Caution: Take your time with this step the UF.L connectors are fragile. If you wish not to disconnect the UF.L cables you can replace the antenna mounts on the Jackal with SMA extensions.

In order to power the Jetson make a cable which connects to the 12V user power to a barrel connector with center positive. Refer to the Jackal manual for the pinout of the user power. We used one of the molex user power connectors.

Warning: Make sure not to plug this into the ITX power plug on the power distribution board.

Step 3: Installing the Software¶

Download the latest version of Nvidia’s SDK Manager on a PC running Ubuntu 18.04. While that’s downloading, put the TX2 into reovery mode by following these steps:

Connect the TX2 to your PC using the provided microUSB cable.
Make sure the TX2 is powered off
Connect a monitor, mouse, and keyboard to the Jetson. (The mouse is optional, but recommended. If you do not have an all-in-one mouse+keyboard you will need to use a small USB hub, as the Jetson TX2 only has a single USB port.)
Press and hold the REC button
Press the power button.

Install the SDK Manager by running the following commands:

cd <folder where you downloaded SDK manager>
sudo dpkg -i sdkmanager_<version>_amd64.deb

Note

If your system is missing dependencies you may see error messages in the output of the dpkg command. To resolve these, run sudo apt-get -f install.

Login the the SDK Manager using your NVIDIA developer credentials.

You do not need to setup your Host Machine unless you are planning on doing Cuda work on your local computer. This can usually be disabled. Under the Target Hardware, make sure to choose TX2.

Click Next and accept the terms. Make sure the Download and Target directories are in locations that you have write-access to and that your hard drive has enough space for the files.

Enter your sudo password

The SDK manager will download the necessary files and install the image on the Jetson.

During the install, make sure to plug a keyboard and monitor into the Jetson. On first boot, it will go through the usual Ubuntu setup steps. Accept the Licenses

Choose your language

Choose your keyboard layout

Set your location.

Pick a hostname, username, and password for the machine.

Note

For compatibility with older versions of the Jetson TX2 software, set the username and password to nvidia. To standardize with other Clearpath Robotics products, set the username to administrator and the password to clearpath.

It will complete the installation and install the remaining standard packages.

Once the OS is setup, you will be brought to the desktop.

Open a terminal and run ifconfig to see the IP address it is using. You will need to connect it to network through wireless or ethernet.

Back in your host machine, it will be waiting to install the extra SDK components on your Jetson. Enter the username, password, and IP address you found above.

The install will connenct to the remote Jetson over the network. It will continue the install by transferring the files and install them.

You can check the terminal window to see the progress of individual commands. This process will take a while, so it can be nice to verify that the process isn’t stalled.

Once the process is done, you can click FINISH to close the window.

Once the OS has been written to the TX2, log into it and run the following commands to configure it for use with Jackal:

wget -c https://raw.githubusercontent.com/clearpathrobotics/ros_computer_setup/main/install.sh && bash install.sh

Note

If curl is not installed on your Jetson by default you can install it by running sudo apt-get install curl

These commands will download and install ROS along with the necessary APT packages to get Jackal up and running. Depending on your network speed it may take a long time for everything to install. Reboot the TX2 after these commands are done to complete the configuration.

When the Jetson starts up again, it should be connected to the Jackal. To see that the Jackal is connected by opening a terminal and executing “rostopic echo /status”. You should see a 1hz message containing the Jackal’s diagnostic information.

Your Jetson TX2 should now be configured to operate as the Jackal’s main PC.

If you would like to pair a PS4 controller to drive the Jackal, hold down the PS and Share buttons on the controller until the light bar starts to flash. In a terminal on the Jackal, run bluetoothctl and then run the following commands:

agent on
scan on
< look for the MAC address of your controller; it will be identified by "Wireless Controller" or similar text >
scan off
pair <MAC ADDRESS>
trust <MAC ADDRESS>
connect <MAC ADDRESS>
< ctrl + d to exit >

The light on the controller will turn solid blue once it is paired. With the controller paired you should be able to control the Jackal by pressing L1 and using the left stick to drive. For more information see the Jackal manual.

To use your host computer with the Jackal first install ROS. Once ROS is installed, install the Jackal packages with sudo apt install ros-melodic-jackal*

Note the IP address of the TX2 and setup your host computer to use it as the master.

You can then run roslaunch jackal_viz view_robot.launch on your host machine. You should see a model of the robot and be able to move the Jackal using the interactive markers. See: Navigating with Jackal for more information on using maps for navigation and localization.

The TX2 will reboot and will have ROS Melodic installed along with the Jackal drivers.

To setup the Jetson to work with the Jackal, run bash ~/JACKAL_SETUP.sh on the Jetson and restart. When the Jetson starts up again, it should be connected to the Jackal. To see that the Jackal is connected by opening a terminal and executing “rostopic echo /status”. You should see a 1hz message containing the Jackal’s diagnostic information.

If you would like to pair a PS4 controller to drive the Jackal, hold down the PS and Share buttons on the controller until the light bar starts to flash. In a terminal on the Jackal, run sudo ds4drv-pair and wait for the controller to connect. With the controller paired you should be able to control the Jackal by pressing L1 and using the left stick to drive. For more information see the Jackal manual.

To use your host computer with the Jackal first install ROS (http://wiki.ros.org/melodic/Installation) and setup a catkin workspace (http://wiki.ros.org/catkin/Tutorials/create_a_workspace). Clone the general Jackal repo and the desktop specific repo in to the src folder and compile it. Installing rosdeps if necessary with “rosdep install –from-paths src –ignore-src -r -y”. https://github.com/jackal/jackal and https://github.com/jackal/jackal_desktop. Note the network ip of the TX2 and setup your host computer to use it as the master. http://wiki.ros.org/ROS/Tutorials/MultipleMachines

You can then run “roslaunch jackal_viz view_robot.launch” on your host machine. You should see a model of the robot and be able to move the Jackal using the interactive markers. See: http://www.clearpathrobotics.com/assets/guides/jackal/navigation.html