.. _tutorial_powerprog:

Powering and Programming Interface
=================================

**Note: This tutorial is applicable for Kerloud UAV products equipped with Jetson Nano only.**

Nvidia Jetson Nano supports two power options: micro USB powering and DC jack powering.
The default option for the Kerloud UAV package is the DC jack, highlighted in the figure below. The micro USB powering
can be activated by disconnecting the J48 jumper in the Jetson Nano carrier board. We advise users to use the DC jack as the micro USB
port can only deliver maximum 2A current which is not sufficient for heavy computation burden.

.. image:: ../img/power_dcjack.png
   :height: 550 px
   :width: 750 px
   :scale: 60 %
   :align: center

By connecting the Jetson Nano with a screen via a HDMI cable, we can log in the onboard computer. Note that only screens with native
HDMI ports are supported by Jetson Nano. The default user name and password are both _ubuntu_. We installed the QTcreator as the default IDE for software programming.

.. image:: ../img/qtcreator.png
   :height: 450 px
   :width: 750 px
   :scale: 100 %
   :align: center

Users can also log into the computer remotely. To achieve this, both the Jetson Nano and remote PC have to be in the same
local wifi network. Suppose the IP address for the Jetson Nano is: 192.168.0.101, then we can log into it with commands:

::

        sudo apt update
        sudo apt install openssh-server
        ssh ubuntu@192.168.0.101

.. image:: ../img/remoteSSH.png
   :height: 450 px
   :width: 750 px
   :scale: 100 %
   :align: center

To avoid the troublesome of changing IP address, users can set the IP manually for the Jetson Nano in the wifi connection options.

.. image:: ../img/ipmanualsetting.png
   :height: 550 px
   :width: 700 px
   :scale: 65 %
   :align: center