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Some questions when choosing a development board that supports Bluetooth direction finding.

shuang

Hi, I am Shuang. I am now working on the Bluetooth direction finding function, but I have some problems, and I hope I can get your help.

  1. I have experimented with Bluetooth direction finding using nrf52840dk_nrf52840, but the example fails to pass. Specifically, it returned a -134 error code when updating the CTE parameter. On the introduction page of the nRF52840, it claims to support Bluetooth 5.2. My question is, is it possible that Bluetooth 5.1 direction finding is not implemented in this chip?
  2. On the nRF52811 introduction page, it explicitly states that the nRF52811 supports Bluetooth direction finding and that the recommended development tool for the nRF52811 is the nRF52840dk. Another Q&A post also describes nRF52811. However, the nRF52840dk does not support Bluetooth direction finding. My question is, if I use the nRF52811 chip for Bluetooth direction finding development, what development tool should I use?
  3. In the official samples, it looks like nrf52833dk_nrf52833, nrf52833dk_nrf52820, and nrf5340dk_nrf5340 support Bluetooth direction finding. I want to know if the acquired IQ samples contain frequency and phase information. In other words, what board should I buy if I want to get IQ packets?
  4. I noticed that some sales channels sell not only the nRF5340dk but also the nRF5340 Preview Dev Kit. I am curious what the difference is between the nRF5340pdk and the nRF5340dk.

Thank you so much for taking the time to read this entire post, and I sincerely hope I can enlist your assistance!

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    Hi Shuang,

    I have experimented with Bluetooth direction finding using nrf52840dk_nrf52840, but the example fails to pass. Specifically, it returned a -134 error code when updating the CTE parameter. On the introduction page of the nRF52840, it claims to support Bluetooth 5.2. My question is, is it possible that Bluetooth 5.1 direction finding is not implemented in this chip?

    As you may have seen in the introduction page of nrf52811 SoC, the nrf52840dk_nrf52840 does not support the Bluetooth 5.1 direction finding.

    On the nRF52811 introduction page, it explicitly states that the nRF52811 supports Bluetooth direction finding and that the recommended development tool for the nRF52811 is the nRF52840dk. Another Q&A post also describes nRF52811. However, the nRF52840dk does not support Bluetooth direction finding. My question is, if I use the nRF52811 chip for Bluetooth direction finding development, what development tool should I use?

    You can use the nrf52811 on the nrf52840dk, but only for transmission (tag). It would be better to use the nrf52833.

    In the official samples, it looks like nrf52833dk_nrf52833, nrf52833dk_nrf52820, and nrf5340dk_nrf5340 support Bluetooth direction finding. I want to know if the acquired IQ samples contain frequency and phase information. In other words, what board should I buy if I want to get IQ packets?

    The nrf52811 can obtain the IQ packets, but it's not able to process the IQ-data. Refer here.

    I noticed that some sales channels sell not only the nRF5340dk but also the nRF5340 Preview Dev Kit. I am curious what the difference is between the nRF5340pdk and the nRF5340dk.

    The PDK is a Preview DK and is like a beta version before releasing the DK and is recommended for developers who wish to experiment. It can behave a bit different and may have a few bugs / errors which are rectified in the DK.

    Kind Regards,

    Priyanka

  • 0 in reply to Priyanka

    Firstly, thank you for your detailed answer.

    Priyanka said:
    The nrf52811 can obtain the IQ packets, but it's not able to process the IQ-data. Refer here.

    What about nrf52833dk_nrf52833 and nrf5340dk_nrf5340? Can they obtain the IQ packets and process the IQ-data?

  • +1 in reply to shuang

    Hi Shuang,

    Yes, both the nrf5340 as well as nrf52833 are capable of direction finding as well as to obtain the IQ data, and they also have the capacity to process the IQ data, but the algorithm is not provided by us.

    The nrf52811 is used for the transmission and the nrf52833 is recommended for looking at the transmitter side. As for direction finding in general, the nrf52833 DK or the nrf5340 DK is recommended. 

    Kind Regards,

    Priyanka

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  • +1 in reply to shuang

    Hi Shuang,

    Yes, both the nrf5340 as well as nrf52833 are capable of direction finding as well as to obtain the IQ data, and they also have the capacity to process the IQ data, but the algorithm is not provided by us.

    The nrf52811 is used for the transmission and the nrf52833 is recommended for looking at the transmitter side. As for direction finding in general, the nrf52833 DK or the nrf5340 DK is recommended. 

    Kind Regards,

    Priyanka

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