distance measurement with RSSI in nrf52 and android device.

[ved]

hello everyone.. i am using nrf52 PCA10040 board with custom application. in that i want to estimate distance between android device and PCA10040 board when connected. i am getting RSSI in my app. i want to read distance in app. i am using softdevice s132. can anyone show me way of how to do this or any example. thanks..

[FormerMember]

When using S132, you can use sd_ble_gap_rssi_get(..) to get the RSSI for the last connection event. Using sd_ble_gap_rssi_get(..) requires that you first have started RSSI reporting using sd_ble_gap_rssi_start(..).

sd_ble_gap_rssi_start(..) will initiate "continuous" RSSI update when the RSSI changes, through the event BLE_GAP_EVT_RSSI_CHANGED, see this message sequence chart.

[awneil]

There is no simple, straightforward formula to directly calculate distance from RSSI.

The best you can hope for is really just a very rough indication of "near" or "far".