XIAO BLE SENSE: nrf52840 radio communication with nrf24L01+

XIAO BLE SENSE: nrf52840 radio communication with nrf24L01+

Establishing a communication layer using the RF24 API 

I recently received an XIAO BLE Sense board from based on the nrf52840 and have been playing around with it for a few days now. In that time I have been able to get audio recording working with my AutoAnalogAudio library, as well as establish basic radio communication with the nrf24l01+ modules. This thing is pretty sweet! It is very small, so I've been leaving it connected to the USB cable so I don't lose it, but its definitely a benefit.

One of the first things to know about this board is that it has a DFU functionality, so it switches ports while uploading, and goes back to the original port after uploading. This means that if you upload some code that crashes the device, you need to press the reset button twice quickly, and it will reaload into DFU mode on a different port, so you can re-upload some working code.

Secondly, if you get an error 'Property 'upload.tool.' is undefined' then you just need to select the correct upload port.

It also uses a USB-C connector, so make sure to have the correct cable handy.

Radio Communication:

To get radio communication working, I've written an Arduino library for the nrf52840 which can be found here: It can be installed just like any other Arduino library.

The library includes one example for now, gettingStarted. To get this example working with the Arduino example from the RF24 library, the following parameters need to be set in the RF24 example:

  1. Call radio.enableDynamicPayloads();
As of this writing, the library only supports reception, and there is no Auto-Ack functionality yet. This is just a preliminary draft of the API.

So far I am very intrigued with this device and its capabilities. Hopefully it isn't too much to get transmission and auto-ack working, but we will see I guess.


Jemal said...

Hello how are you, can you pls tell me how I can use your library "Audio streaming over NRF24L01+ radio link" I know you have mentioned here as an advanced feature but I'm new for arduino programming and I could really use your help on streaming audio content.

TMRh20 said...

I don't have the AutoAnalogAudio library working with the XIAO BLE Sense yet, it is in preliminary stages, but on AVR devices you can use the library to stream audio. It is simple to use and comes with examples.

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