Finding distance from RSSI value of Bluetooth Low Energy enabled device

Question

I am working on Bluetooth low energy concept project. I am getting the RSSI value between 1 and 100. As I move the tag the RSSI value increase as the peripheral moves away

Answer 1

There are quite a number of RSSI-based localization techniques like triangulation and fingerprinting. None of them are perfect. RSSI is affected by many factors like obstacles, multipath fading, antenna polarization and cross-body shielding.

The theoretical relationship between RSSI and distance is something like this:

RSSI[dbm] = −(10n log10(d) − A) 

where d is the distance and A is the offset which is the measured RSSI 1 meter point away from the BLE device.

Simply google for RSSI[dbm] = −(10n log10(d) − A) and you will find some sources about it.