How to measure the distance between the nRF52840 and a smartphone using the Nordic Distance Measurement library?

RE: How to measure the distance between the nRF52840 and a smartphone using the Nordic Distance Measurement library?

overclocker — Mon, 27 Mar 2023 10:27:35 GMT

Thank you for your answer.

As it is difficult to have another nRF52 in my use case, I will use RSSI, knowing that it is not accurate.

Thank you very much.

RE: How to measure the distance between the nRF52840 and a smartphone using the Nordic Distance Measurement library?

Kazi Afroza Sultana — Fri, 24 Mar 2023 13:43:02 GMT

RSSI is the simplest way of measuring between a phone and an nRF52 device. Even though it is not accurate. I am not aware of other better way, unless you have an nRF52 close to the phone, that uses the Distance measurement library to find the distance to the initial nRF52, and later to report the information to the phone.

RE: How to measure the distance between the nRF52840 and a smartphone using the Nordic Distance Measurement library?

overclocker — Mon, 20 Mar 2023 00:02:22 GMT

Thank you for your answer.
I have also reviewed the documents you provided.

I also understood that the Nordic Distance Measurement Library uses various factors to measure distances and that smartphones cannot be used.

Conversely, is there a better way to measure the distance between the nRF52840 and the smartphone?

RE: How to measure the distance between the nRF52840 and a smartphone using the Nordic Distance Measurement library?

Kazi Afroza Sultana — Sat, 18 Mar 2023 13:04:44 GMT

Hello,

Is it possible to use the Nordic Distance Measurement library in conjunction with a smartphone application such as Andorid or iPhone?

No, It is not possible. The Nordic Distance Toolbox (NDT) is a set of methods for measuring the distance between two of Nordic's SoCs. One device configured as reflector and another device as initiator, so it could not support one of them be smartphone. Using signal strength (RSSI) for estimating distance is the inherent disadvantage of the technology for getting precise distance measurements. Since there are so many factors such as reflections and physical blocking effect the signal strength of the signal, hence the calculation of distance.

Here is a slides of our distance measurement webinar you can look at https://devzone.nordicsemi.com/cfs file/__key/communityserver-discussions-components-files/4/Measuring_5F00_distance_5F00_with_5F00_Nordic_5F00_Distance_5F00_Toolbox_5F00_slides.pdf

Here is the documentation of using Distance Measurement Library: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/libraries/others/dm.html

Thanks.

Kazi