> For the complete documentation index, see [llms.txt](https://docs.sky-drones.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sky-drones.com/avionics/smartlink/interfaces.md).

# Interfaces

## Air Module

### Top

Antenna SMA connectors

![](/files/-MTN5v8AdNGPw4WSdddd)

### Left

* 5V DC power input socket
* Reset button
* CSI camera Port
* USB for firmware upgrade
* SPI 0 / 1
* I2C 0 / 1
* UART 0 / 1 (console and autopilot telemetry)

![](/files/-MTN5v8B9P2moi1R96gz)

{% hint style="info" %}
Pin numbers are referenced to MOLEX 53261-0671 connector pinout. 
{% endhint %}

#### SPI1 Connector pinout - MOLEX 53261-0671

<table><thead><tr><th width="150">Pin</th><th>Name</th></tr></thead><tbody><tr><td>1</td><td>5V OUT</td></tr><tr><td>2</td><td>SPI1 SCLK</td></tr><tr><td>3</td><td>SPI1 MISO</td></tr><tr><td>4</td><td>SPI1 MOSI</td></tr><tr><td>5</td><td>SPI1 CS0</td></tr><tr><td>6</td><td>GND</td></tr></tbody></table>

#### I2C Connector pinout - MOLEX 53261-0671

<table><thead><tr><th width="150">Pin</th><th>Name</th></tr></thead><tbody><tr><td>1</td><td>5V OUT</td></tr><tr><td>2</td><td>I2C1 SCL</td></tr><tr><td>3</td><td>I2C1 SDA</td></tr><tr><td>4</td><td>I2C2 SCL</td></tr><tr><td>5</td><td>I2C2 SDA</td></tr><tr><td>6</td><td>GND</td></tr></tbody></table>

#### UART Connector pinout - MOLEX 53261-0671

<table><thead><tr><th width="150">Pin</th><th>Name</th></tr></thead><tbody><tr><td>1</td><td>5V OUT</td></tr><tr><td>2</td><td>DBG RX</td></tr><tr><td>3</td><td>DBG TX</td></tr><tr><td>4</td><td>TEL RX</td></tr><tr><td>5</td><td>TEL TX</td></tr><tr><td>6</td><td>GND</td></tr></tbody></table>

#### SPI0 Connector pinout - MOLEX 53261-0671

<table><thead><tr><th width="150">Pin</th><th>Name</th></tr></thead><tbody><tr><td>1</td><td>5V OUT</td></tr><tr><td>2</td><td>SPI0 SCLK</td></tr><tr><td>3</td><td>SPI0 MISO</td></tr><tr><td>4</td><td>SPI0 MOSI</td></tr><tr><td>5</td><td>SPI0 CS0</td></tr><tr><td>6</td><td>GND</td></tr></tbody></table>

**TEL (Telemetry) port:** TTL 3V3, Baudrate 57600

**DBG (Debug) port:** TTL 3V3, Baudrate 9600

### Front

Front side has an integrated fan. It is important to have a clear space to allow for air flow circulation in front of this side.

![](/files/-MTN5v8MSPOvS8sOUVSB)

### Right

* Mini HDMI input
* Micro SD card slot
* Camera status LEDs

![](/files/-MTN5v8NS8Gf5o8mMLAY)

### Rear

USB A connectors for peripherals connection, for instance:

* 4G / LTE modem
* Rockblock satellite communication system
* FLARM ADSB system

![](/files/-MToYpgnETBHbmkM71gr)

### Bottom

![](/files/-MTN5v8PKSL8H_9yBMZr)

## Ground Module

### Top

The top side has an a heatsink and mounting holes for an optional fan. It's important to have a clear space to allow for airflow circulation in front of this side.&#x20;

<figure><img src="/files/f1erIG70613wVJBfR14H" alt=""><figcaption></figcaption></figure>

### Left

<figure><img src="/files/CcEqQwnVUI1bzQe7Kgep" alt=""><figcaption></figcaption></figure>

### Front

SMA antenna connectors for antennas

Status LEDs:

* TX: blinking when packets are being transmitted
* RX: blinking when packets are being received
* CPU: module operating
* RSSI: signal quality

<figure><img src="/files/mIWUtmqUgytZP31DBgtG" alt=""><figcaption></figcaption></figure>

### Right

* Reset button
* Fan port

<figure><img src="/files/dEevlY9yf48mAImeiza7" alt=""><figcaption></figcaption></figure>

### Rear

* USB to connect to computer / tablet
* Ethernet port (RJ45)
* Power supply, 7-35V DC
* Serial port

<figure><img src="/files/GLiTwtrIlvYi9lsfVCCu" alt=""><figcaption></figcaption></figure>

### Bottom

<figure><img src="/files/UZ4FLMGeUbsx5QcRsJCE" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
Looking for CAD files? Here they are:
{% endhint %}

{% content-ref url="/pages/-MTQeiny65kIZfq2knvm" %}
[CAD Model](/avionics/smartlink/cad-model.md)
{% endcontent-ref %}