[Catbert59]

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)

[a2128]

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!)

[CheeseFromLidl]

You can look at lightning in an SDR receiver, they look like horizontally oriented stretched droplets. Somewhere around 7kHz iirc.

[joezydeco]

Blitzortung is a little long in the tooth. Great tech, but the mapping doesn't let you get any detail. Lightningmaps.org scrapes the feed but will sometimes just completely stop functioning and never come back.

[yonatan8070]

> The STM32H7 ADC is great for many many things

Is it any different from the ADC on other MCUs?

[Catbert59]

Not really. Just very good ones.

I also work a lot with ESP32s. Their ADCs (non-linearity, and with the integrated calibration you loose resolution) don't make too much fun.