> For the complete documentation index, see [llms.txt](https://docs.acecentre.org.uk/products/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.acecentre.org.uk/products/relaykeys/installation/supported-boards/adafruit-itsybitsy-nrf52840.md).

# Adafruit Itsybitsy nRF52840

![](/files/kxfP52CzBYQaoUwGweGf)

Either use the drag and drop UF2 method or more steps involved - Arduino uploading method.\
\
For the UF2 method

* Download the UF2 file for the itsybitsy *board in the current release*
* Double click that reset button. You will then get a USB drive on your computer. Drag and drop the UF2 file to the root of that drive.
* It SHOULD disconnect from your pC if successful – but as I say the loghts should change colour to Green
* More details see the steps [here](https://learn.adafruit.com/adafruit-metro-m0-express/uf2-bootloader-details#entering-bootloader-mode-2929745)

Or the Arduino uploading method.

* Check the setup of your [Arduino IDE](https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/arduino-bsp-setup) (remember we're using the nRF52840 board!)
* Upload the [sketch](https://github.com/AceCentre/RelayKeys/blob/master/arduino/arduino_nRF52840/arduino_nRF52840.ino) to your feather.
* Run the server side code
* Done!


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.acecentre.org.uk/products/relaykeys/installation/supported-boards/adafruit-itsybitsy-nrf52840.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.