> For the complete documentation index, see [llms.txt](https://docs.petoi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.petoi.com/~/changes/MnaoHQ6wOvffal3XIPZR/arduino-ide/serial-monitor.md).

# Serial Monitor

### Connect the USB Adapter

Connect the USB adapter to the mainboard and select the correct serial port. Please refer to the [Connect NyBoard section](https://docs.petoi.com/communication-modules/usb-downloader-ch340c#connect-nyboard) in the USB Uploader Module for specific steps.

![](/files/HzLGPoEbbiAkP6ySVyut)

You can choose the "Serial Monitor" in "Tools" menu bar, or click the ![](/files/rFegvOusKIAfaewQ5pHB) button to open the serial monitor window:

![](/files/3qVD0VPFEtSelxddsD66) ![](/files/NfoeNDc4SxSFe0pPUCuq)

Open up the serial monitor and set up the baud rate. With NyBoard V1\_\*, set  "**No line ending**" and the baud rate to **115200** in the serial monitor. 

![](/files/HqQm5fVMgFHfBfpSG7WR)

### Connect Bluetooth uploader (optional)

For specific steps, please refer to the [Connect NyBoard section](https://docs.petoi.com/communication-modules/dual-mode-bluetooth#connection-with-nyboard) in the Dual-Mode Bluetooth Module.

Then you can select it under **Tools->Port** of Arduino IDE, and use it in the same way as the USB adapter. 

{% hint style="warning" %}
On Mac, the Bluetooth may lose connection after several uploads. In that case, delete the connection and reconnect to resume the functionality.
{% endhint %}

{% hint style="warning" %}
The Bluetooth dongle is not included in the kit sold by Seeed Studio or its partners. Please write to <support@petoi.com> for more information.&#x20;
{% endhint %}

With the USB adapter / Bluetooth module connecting NyBoard and Arduino IDE, you have the ultimate interface - **Serial Monitor** to communicate with NyBoard and change every byte on it(via sending the serial commands based on the [serial protocol](https://app.gitbook.com/o/-M-_eWZUjFA4usjshHcZ/s/-MQ6a951Q6Jn1Zzt5Ajr-887967055/~/changes/DHad2hALnPq88oSLEuF1/serial-protocol)).


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