.. include:: /index.rst
   :start-after: start_hello_message
   :end-before: end_hello_message


.. _assemble_hat:

.. start_assemble_hat

Assemble and Power on Fusion HAT+ (Important)
=======================================================

Connect Fusion HAT+ to Raspberry Pi
----------------------------------------

Here, we'll teach you how to assemble the Fusion HAT+.

#. Assemble the base.
#. Stick the battery to the base.
#. Secure the Raspberry Pi with with standoffs.
#. Connect the FPC cable to the Raspberry Pi. (We will assemble it and the Camera Module when assembled the pan-tilt.)
#. Plug the Fusion HAT+ into the 40-pin connector on the Raspberry Pi. 
#. **Insert the battery.** (This is very important. If you don't insert the battery, the Fusion HAT+ will not work.)


For the details of the assembly, please check the video below.

.. raw:: html

  <iframe width="100%" 
    style="aspect-ratio: 16/9; max-width: 100%;"
    src="https://www.youtube.com/embed/HlAayd1mSxU?si=oZnKyZihyyjQhsHl" 
    title="YouTube video player" 
    frameborder="0" 
    allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" 
    allowfullscreen>
    </iframe>



Charge
-------------------

Before the first use, it is recommended to fully charge the battery. You can use the included USB Type-C charging cable, or your own USB-C charger.  

.. note::

  The battery may arrive with low charge because Amazon requires it to be below 30% before air shipment. You **MUST** fully charge it before use to prevent over-discharge and damage.
  Plug the USB-C to Fusion HAT+, and the battery will be charged automatically. You don't need to connect the power supply to the Raspberry Pi.

* We recommend using a **5V 3A power supply**, such as the official Raspberry Pi 15W adapter.  
* You can also use a **USB-C PD (Power Delivery)** charger or a **QC 2.0 fast charger**.  
* Charging from 0% to full typically takes about **2 hours**.  

.. image:: img/power_charge.jpg
   :width: 400
   :align: center

The Fusion HAT+ includes **two battery indicator LEDs**, showing the battery voltage level:  

.. list-table::
   :header-rows: 1
   :widths: 40 40

   * - LED Status
     - Battery Voltage
   * - 2 LEDs ON
     - > 7.4V
   * - 1 LED ON
     - < 7.4V
   * - Both LEDs OFF
     - < 6.5V

When charging, one of the LEDs will blink to indicate charging progress:  

.. list-table::
   :header-rows: 1
   :widths: 40 40

   * - LED Status
     - Battery Voltage
   * - 1 LED ON, 1 LED Blinking
     - > 7.4V
   * - Only 1 LED Blinking
     - < 7.4V


After fully charged:

* **If the Fusion HAT+ is ON**, both LEDs will remain lit.  
* **If the Fusion HAT+ is OFF**, both LEDs will turn off.  

.. note::

   For extended programming or debugging sessions, you can keep the Fusion HAT+ powered  
   by connecting the USB-C cable, which will charge the battery and run the Fusion HAT+ at the same time. 
   Even if you run the Fusion HAT+ while the charer is connected, the battery **cannot** be removed.

Power ON
----------------------

When the battery has sufficient charge, press the **power button** on the Fusion HAT+ briefly. 

* The **PWR LED** will turn on.  
* The **battery LEDs** will also light up.  
* The Raspberry Pi will power on automatically.  

.. image:: img/power_button.jpg
    :width: 400

.. end_assemble_hat



.. _assemble_fusion_hat_pan_tilt:

Assemble the Pan-tilt (For Camera) 
------------------------------------------------------

To make using the camera module easier, you can assemble a pan-tilt.

.. note:: 
  
  Assembling the pan-tilt may obscure some pins, so it is recommended to assemble it only when using the camera, or place it on the outside after assembly.


.. image:: img/gimbal_assemble.png

For the details of the assembly, please check the video below.

.. raw:: html

  <iframe width="100%" 
    style="aspect-ratio: 16/9; max-width: 100%;"
    src="https://www.youtube.com/embed/mDCNKVzNLkg?si=2gYJ1feopWgglekR" 
    title="YouTube video player" 
    frameborder="0" 
    allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" 
    allowfullscreen>
    </iframe>