Can distance be set between nRF52840 and APP? For example, set 5m and 10m through app. When the distance between nRF52840 and APP exceeds the set distance, app will remind you

[liuyanfeng]

Can distance be set between nRF52840 and APP? For example, set 5m and 10m through app. When the distance between nRF52840 and APP exceeds the set distance, app will remind you

What can I do to implement this feature? Let me know if anyone knows. Thank you

thanks

[Karl Ylvisaker]

Hello,

What can I do to implement this feature? Let me know if anyone knows. Thank you

Unfortunately this sort of accuracy is not really feasible to achieve with a BLE connection.
You could attempt to use the received signal strength indicator (RSSI) to gauge if the device is 'near', 'far', or 'gone', but you will not be able to achieve a higher accuracy than this most likely. This is because the RSSI depends on so many external factors other than the distance between the devices, such as line-of-sight, multipath, environment noise, etc. There are already a number of posts here on the forum discussing the possibility to do distance measuring using RSSI that you should look through for a better understanding of why this likely will not work.

Best regards,
Karl

[liuyanfeng]

OK ,thanks a lot

[Karl Ylvisaker]

No problem at all, I am happy to help! :) 

Please do not hesitate to open another ticket if you should encounter any issues or questions in the future.

Best regards,
Karl