A firmware for the Heltec Wifi LoRa32 V3 and LilyGo TTGO LoRa32 V2.1_1.6 boards (433MHz version only). Its purpose is receiving meteorological radiosondes. To be used in conjunction with your phone and the Trova La Sonda app for Android. Be sure to select "Bluetooth Low Energy" to connect to the device.
Absolutely. A donation to a charity would be much appreciated as a way to say thanks. I especially recommend the Landmine Relief Fund.
Definitely. See the code on github.
We all stand on the shoulders of giants. Part of the decoding code is taken from sondedump, the RS decoders and the rdz_ttgo_sonde firmware. This page was made possible by esp-web-tools.
As of today (April 11, 2026) it has undergone quite some testing, mostly by me. But beware if you rely solely on this solution to locate sondes in the wild...
| Model | Tested in the lab | Tested in the wild |
|---|---|---|
| Vaisala RS41 | yes | yes |
| Vaisala RS41+AUX | yes | yes |
| Meteomodem M10 | yes | no |
| Meteomodem M20 | yes | yes |
| Graw DFM-09 | yes | no |
| Graw DFM-17 | yes | no |
Connect your board to your PC with an USB cable and click this button: