BLE senseing Bluetooth and dBi and using dbi level for functional condition setting

RE: BLE senseing Bluetooth and dBi and using dbi level for functional condition setting

Sigurd — Thu, 20 Oct 2016 07:46:20 GMT

When the dB is ≈ -64dB the distance between the devices is about 30 cm. So when the dB is -63 or less, indicating <30cm distance, pairing is allowed.

RE: BLE senseing Bluetooth and dBi and using dbi level for functional condition setting

Gillgen1 — Wed, 19 Oct 2016 18:23:28 GMT

Is the -64dB RSSI threshold on RX packet a minimum of <30 cm or a maximum radius or diameter as these are both different.

RE: BLE senseing Bluetooth and dBi and using dbi level for functional condition setting

Sigurd — Fri, 14 Oct 2016 13:06:28 GMT

You will have to use RSSI. In the SoftDevice you have functions like sd_ble_gap_rssi_get(), sd_ble_gap_rssi_start() and sd_ble_gap_rssi_stop() to measure the RSSI. You can read more about these functions here.

RSSI is used in e.g. the "Close Proximity Pairing" functionality in the Gazell library, where the host and device need to be in close proximity to each other to allow pairing. Here a -64dB RSSI threshold on the RX packet power is used to indicate if the device is within <30 cm.