wifi detection to avoid interferance

[Larry Harmon]

Is it possible to use an nrf51822 to detect Wi-Fi channels / frequencies in use for the purpose of avoiding them?

[Øyvind Karlsen]

Hi,

Yes, to a certain degree. The nRF5 series can sample indicent power at the antenna port by using the RSSI module.

If using BLE this is already implemented, the channel map for BLE is aligned so that it is the least likely to receive interference from WiFi (the main source of interference in the 2.4 GHz band), and it also implements frequency hopping when a channel is too bad to get data through.

Best regards,

Øyvind

[Larry Harmon]

Thanks!

We are not using BLE, just direct radio control. I wrote a simple test which reads the RSSI 1000 times on each frequency from 2.401 thru 2.482. I seem to be getting reasonable results, but I'm curious how BLE samples RSSI values. Does it scan all frequencies? Does it take multiple RSSI samples per frequencies? How oftes?