Radar based precipitation sensor using a 24 GHz radar sensor modul (IPM-170, RSM-1700, IPM-165 or CDM324) with a 57.6 dB low noise preamp and an ESP32 for signal processing and data transfer to a FHEM server.
Schematics and discussion can be found in the FHEM forum under the following link: https://forum.fhem.de/index.php/topic,73016.0.html