# Airscope Assembly

This page describes the basic assembly workflow for building one Airscope.

## Assembly Steps

Before starting, inspect the filters, objective lens, and image sensor to make sure they are clean. Also inspect the Airscope housing to make sure it is clean, free of debris, and has good surface quality. Follow the steps below:

::::{grid} 1 1 3 3
:gutter: 3

:::{grid-item}
```{image} ../assets/images/A1@4x.png
:alt: Install the objective lens module
:align: center
:class: narrow
```

**Step 1: Install the Objective Lens Module**

Place the objective lens module into the lens slot on the top side of the Airscope housing. Gently press the lens module into the slot until it is fully seated. The lens should sit flat in the housing without obvious tilt or gaps.
:::

:::{grid-item}
```{image} ../assets/images/A2@4x.png
:alt: Install the four excitation filters
:align: center
:class: narrow
```

**Step 2: Install the Four Excitation Filters**

Insert the four excitation filters into the designed filter slots around the illumination path. The coated side should face toward the LED during assembly.
:::

:::{grid-item}
```{image} ../assets/images/A3@4x.png
:alt: Route and fix the LED FPC
:align: center
:class: narrow
```

**Step 3: Route and Fix the LED FPC**

Gently pre-bend the LED FPC to match the shape of the housing. Then wrap the LED FPC around the housing and roughly align the four LEDs with their corresponding LED slots. After confirming that all four LEDs are properly positioned, apply small dots of UV adhesive around the LED corners and between the FPC and the housing.
:::

:::{grid-item}
```{image} ../assets/images/A4@4x.png
:alt: Install the emission filter
:align: center
:class: narrow
```

**Step 4: Install the Emission Filter**

Insert the emission filter into the emission filter slot in the housing. After the filter is fully seated, apply a small amount of UV adhesive at the four corners of the slot to fix it in place. The coated side should face toward the incoming light direction, outside and toward the brain.
:::

:::{grid-item}
```{image} ../assets/images/A5@4x.png
:alt: Attach the housing to the main PCB and connect the LED FPC
:align: center
:class: narrow
```

**Step 5: Attach the Housing to the Main PCB and Connect the LED FPC**

Attach the assembled housing onto the main PCB. There is a rectangular alignment mark around the image sensor on the main PCB. Align the housing edge with this rectangular mark to align the optical center of the housing with the center of the image sensor. After alignment, apply UV adhesive to the four corners of the housing to fix it onto the PCB. Finally, connect the output end of the LED FPC to the board-to-board connector on the bottom of the main PCB.
:::

:::{grid-item}
```{image} ../assets/images/A6@4x.png
:alt: A fully assembled Airscope
:align: center
:class: narrow
```

**Congratulations!**

You now have your Airscope. Please flash the firmware before using the scope if the board has not been programmed already.
:::

::::