> For the complete documentation index, see [llms.txt](https://lessons.mistyrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lessons.mistyrobotics.com/python-elements/misty-python-api/arduino-backpack.md).

# Arduino Backpack

Here you can find API calls to to set up communication between Misty, the Arduino backpack and any additional sensory hardware.

### GetSerialSensorValues <a href="#getserialsensorvalues" id="getserialsensorvalues"></a>

Obtains a list of the most recent messages Misty has received through the universal asynchronous receiver-transmitter (UART) serial port on her back. This list of messages clears each time the system reboots.

{% hint style="success" %}
misty.get\_serial\_sensor\_values()
{% endhint %}

### WriteSerial <a href="#writeserial" id="writeserial"></a>

Sends data to Misty's universal asynchronous receiver-transmitter (UART) serial port. Use this command to send data from Misty to an external device connected to the port.

Misty can also receive data through the UART serial port. To use this data you must subscribe to [`SerialMessage`](https://docs.mistyrobotics.com/misty-ii/robot/sensor-data/#serialmessage) events.

**Example code**

{% hint style="success" %}

```python
misty.write_serial("your-data")
```

{% endhint %}

**Parameters**

```python
misty.write_serial(self, message : str = None)
```

* `message` (string): The message or command to be sent through the serial port. This string is transmitted exactly as provided to any device connected to Misty's serial interface.