Lesson Materials

Hardware Components

Jetson Nano
microSD card
(Preflashed by iD Tech)
microUSB-to-USB data cable
USB-C power cable
USB-C wall adapter

Network Connection

There are two different modes that you can use to access your Jetson Nano device. The first mode is called graphical or headed mode, which consists of connecting your Nano to it's own monitor, keyboard, and mouse so it can function independently. The second mode, which you'll be using throughout this course, is called headless mode.

Headless mode consists of accessing the Nano on an additional computer using a network connection.

Accessing your Nano in headless mode conserves memory resources and eliminates the requirement of extra hardware.

It's also ideal in the virtual classroom because it allows you to screenshare with your instructor anytime you need help troubleshooting or would like additional guidance on your coursework or final project!

Connection Methods

There are three methods to connect to your Jetson Nano module through headless mode. Using secure shell (SSH) protocol over an internet connection is the most efficient way to simplify your hardware setup. With this connection method, you'll be able to limit the hardware that you'll need down to just a USB-C power cable along with either a Wi-Fi dongle or an ethernet cable. Using a Wi-Fi dongle is highly recommended because it means you'd only need to plug in the USB-C power cable each time you're ready to continue working with your Nano.

Ironically, to access your Nano with an SSH over internet connection, you first need to know the IP address associated with that internet connection, which can only be determined while accessing your Nano. There are two available solutions to this paradox: serial communication or SSH over USB device mode. Neither of these modes require an internet connection, so you can use them to access your Nano and determine the IP address before attempting an SSH over internet connection.

Since USB device mode isn't compatible with all devices, you'll learn how to connect using serial communication. Then, you'll setup an internet connection, determine your IP address, install any updates or upgrades needed, and reboot your Nano to prepare for a simplified SSH connection next! The serial communication method consists of using your microUSB data cable to connect the Nano directly to your computer by transmitting data through the cable itself.

Connecting with serial communication:

Insert your preflashed microSD card into the slot on the underside of the Nano module.
- Ensure your microSD card is in place by applying pressure till you hear an audible click. When you release, the card will either remain in place or eject out. In order to work properly, the card needs to sit flush with the edge of the Nano module rather than extending out.
Place your Jetson Nano on a non-conductive surface, such as the cardboard box that it came in.

Important Warning

Operating your Jetson Nano on conductive surfaces - like metals such as aluminum, copper, or silver - can short the pins on the bottom of the board causing damage to module components.
Use the power cable to connect a power source like a wall outlet to the USB-C port on your Nano module.
- Make sure that the green light in the corner of the Nano module is on.
Use the data cable to connect the USB port on your computer to the microUSB port on your Nano module.
- On your desktop, check for the mounted L4T-README drive. If you don't see the mounted drive, double-check that you're using the cable sent to you by iD Tech. The cable must be a data cable, so not every microUSB cable will work. Also, make sure you're plugging it in directly to a USB port on your computer, or that you're using a data-capable adapter.
Use a Spotlight Search to open a Terminal window, then run the command:
```
ls /dev/cu.usbmodem*
```
- The path that shows up in the results is the port that you should use for your serial communication connection!
Use the screen command to start a serial terminal session with the port you just identified:
```
screen /dev/cu.usbmodem[Port-Number] 9600
```
Enter the account login and password to access the terminal of your Jetson Nano module! As a security feature, your password will not appear on the screen as you type, but typing your password as normal and then pressing [enter] should still work as expected!

The preflashed microSD card is setup with account details:
- Nvidia login: nvidia
  
  Password: nvidia

When you're ready to return to your Mac terminal, use sudo reboot to end the session on your Nano.