alt Hacker NewsLooks pretty cool, though kinda "cheating" by pulling from adsb.fi - though I think you'd need something a lot more powerful than an ESP32 to receive and decode ADS-B ;)
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I would actually expect the math to decode ads-b traffic is substantially less complex than, for example, a TLS connection.
Actually possible to receive and decode ADS-B on ESP32, but MLAT is failing (tried hard but not found a trick yet).
Biggest problem isn’t that it’s not powerful enough, but the USB port bandwidth don’t match most SDR.
Using some clever tricks you can receive parts of the message on a slower USB and be able to decode ADS-B
Something like this: https://github.com/CoolNamesAllTaken/adsbee
You could fit a pi zero and rtl in an enclosure not much larger than the one they’ve printed.
Using ADS-B and calling it a "radar" feels wrong to me.
(But is is a cool project)