Audio between 2 nrf52840dk

[Epasta]

Hi all,

if i buy 2 nrf52840dk: Is possible create an audio connection like intercom between the two dk? Can I send my voice from "dev board 1" to "dev board 2"?! and when i send my voice, can i receive the voice of the "dev board 2"? i have seen that with nrf52840 the streaming video is possible, can I listen a2dp of my phone over bluetooth?

thanks best regards Enrico

[endnode]

Hi Enrico,

Be careful, A2DP is Bluetooth classic profile, it is not defined/applicable for Low Energy. There is no "audio" service or profile defined for LE yet but BT SIG is working on something for BT 5.0+. For the time being you ca achieve it with nRF5x devices but you need to defined and optimize the protocol yourself (in other words BLE link could give you necessary bandwidth but you need to make some effort to maintain it you need to understand the limitations such as noisy environment can cause glitches and significant degradation of the throughput = bad audio experience). There are many Q&S on this topic on this forum, you can get some hints there but as far as I know there is no open source implementation of audio streaming over BLE with nRF5x devices.

Cheers Jan

[ovrebekk]

Endnode is correct. While it is technically possible to stream audio over BLE, there are no standard profiles for it.

The only example implementing audio on the nRF52 series (from Nordic at least) is the nRFready Smart Remote 3 reference design, but this is voice quality audio only (for voice recognition purposes no more is needed).

Best regards