4 ms·
The $5 nrf52840 should be sufficient, it can scan 114 channels (from 2400-2514 MHz) several times per second, measuring the approximate RSSI.
by 1e1a 9mo ago
The $5 nrf52840 should be sufficient, it can scan 114 channels (from 2400-2514 MHz) several times per second, measuring the approximate RSSI.
- bethekidyouwant 9mo agoYou could not use that as an SDR to make a waterfall which is required in this case
- 1e1a 9mo agoYou do not need a full SDR to make a waterfall. The nrf52840 can function as a coarse spectrum analyzer, because it lets you tune to any frequency within its range, and then measure the approximate received signal strength over a period of time[0]. I have tested this myself, and it works pretty well. The only downside compared to an SDR is that it can only listen to one frequency at a time, so it will sometimes miss short signals. [0] https://docs.nordicsemi.com/bundle/ps_nrf52840/page/radio.html#ariaid-title9 https://docs.nordicsemi.com/bundle/ps_nrf52840/page/radio.ht...
- bethekidyouwant 9mo agoI know it can switch frequencies, but I predict it wouldn’t make a very pleasing visualization if the updates are slow, but maybe you are right it would look fine for this implementation which is already far off from a waterfall