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= How to Connect to NVIDIA Jetson Orin Nano UART Console =

This guide explains how to connect to the UART serial console of the NVIDIA Jetson Orin Nano Developer Kit using a TTL-to-USB adapter. This is useful for accessing boot logs, debugging early kernel messages, or interacting with the board when other interfaces are unavailable.

== Requirements ==

* NVIDIA Jetson Orin Nano Developer Kit
* TTL-to-USB Serial Adapter (e.g., based on CP2102, CH340, or FT232)
* Jumper wires (Female-to-Female)
* A host computer running Linux or macOS
* Serial terminal software: '''screen''' or '''minicom'''

== NVIDIA Jetson Orin Nano UART Pinout and Wiring ==

Connect the TTL-to-USB adapter to the 40-pin GPIO header of the Jetson Orin Nano as follows:

{| class="wikitable"
|+ UART Pinout (J41 Header on Orin Nano)
! Pin Number !! Signal !! Description !! TTL Adapter Wire
|-
| 8 || UART_TX || Transmit from Jetson || Connect to RXD on adapter
|-
| 10 || UART_RX || Receive into Jetson || Connect to TXD on adapter
|-
| 14 || GND || Ground || Connect to GND on adapter
|}

== Step-by-Step Instructions ==

=== 1. Connect Hardware ===
# Power off the Jetson Orin Nano.
# Connect jumper wires as described in the table above.
# Plug the TTL-to-USB adapter into your computer.

=== 2. Identify the Serial Device ===
On your host machine, run:

<pre>
ls /dev/ttyUSB*
</pre>

You should see something like '''/dev/ttyUSB0'''. This is the serial device you'll use.

== Using screen ==

=== Install screen ===
<pre>
sudo apt update
sudo apt install screen
</pre>

=== Start Serial Console ===
Replace '''/dev/ttyUSB0''' with your actual device:

<pre>
screen /dev/ttyUSB0 115200
</pre>

To exit '''screen''', press:
<pre>
Ctrl + A, then K, then press Y to confirm
</pre>

== Using minicom ==

=== Install minicom ===
<pre>
sudo apt update
sudo apt install minicom
</pre>

=== Configure minicom ===
First, run:

<pre>
sudo minicom -s
</pre>

Navigate to **Serial port setup** and set:
* **Serial device**: `/dev/ttyUSB0`
* **Bps/Par/Bits**: `115200 8N1`
* **Hardware Flow Control**: **No**
* **Software Flow Control**: **No**

Save settings and exit.

=== Start Serial Console ===
After configuration:

<pre>
sudo minicom
</pre>

To exit '''minicom''', press:
<pre>
Ctrl + A, then X
</pre>

== Boot Log Output ==

Once connected, power on the Jetson Orin Nano. You should see U-Boot and Linux boot messages in your terminal window. This console can be used to log in if graphical access is unavailable.

== Troubleshooting ==

* Make sure your TTL-to-USB adapter is recognized by the OS ('''dmesg | grep ttyUSB''')
* Verify correct TX/RX wiring (cross them)
* Use only one terminal program at a time (minicom or screen)
* Ensure baud rate is set to '''115200'''

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