There's also Blitzortung.org which is a very interesting project.
They are receiving Sferics on the lower HF frequencies and tag them with GPS timestamps (with the PPS signal they are in the Nanoseconds precision range). A central server will then do the triangulation.
All with off-the-shelf hardware (STM32, etc.).
Their service is stable for many many years now.
(Offtopic: The STM32H7 ADC is great for many many things)
You can look at lightning in an SDR receiver, they look like horizontally oriented stretched droplets. Somewhere around 7kHz iirc.
I tried to detect lightning with a Bosch Sensortec COTS magnetometer - but failed.
Was a fun experiment: https://www.dm5tt.de/2025/07/26/thunderstorm-detector-with-m...
I’d like to ask to repeat this experiment but with a ferrite core next to the sensor (touching it). On the low spectrum (below a few MHz?) the magnetic component in the electromagnetic wave becomes dominant. Which is why receivers in shortwave radio and in e.g. DCF77 use a ferrite antenna. The ferrite’s length should be perpendicular to the line formed by the sensor and the location of the storm.
Edit: you’re reading at 400 Hz so you’ll read phenomena below 200 Hz
> The STM32H7 ADC is great for many many things
Is it any different from the ADC on other MCUs?
Whenever it thundered I used to love to take out my shortwave radio, tune into some empty frequency and be able to hear each individual lightning strike in realtime (even more realtime than the speed of sound would allow!)