#1 2020-02-18 19:55:01

user11
Member
Registered: 2015-09-18
Posts: 10

ESP32 LoRa APRS

Unfortunately, e-mail system on the forum was not operational, hence could not restore forgotten password smile

Want to write couple of words about experiments with APRS over LoRa. Today LoRa modules are pretty cheap, around 3-4$ per piece, ESP32 dev board with WiFI and Bluetooth on board is around 4-5$. Bought couple of LoRa modules and built shields for ESP32, it has Bluetooth on board, so made it headless by implementing KISS over Bluetooth, so modem could be used with both APRSDroid and computer with ax25. The same code base could be used in client mode or as APRS iGate. With only 50-100 mW was able to reliably sent packet over 12 km distance. Decoding was possible down to -19.25 dB SNR. iGate appends signal report into APRS comment, it is quite useful, because it is possible to see exact signal levels in different points.

It is still experimental, sharing the code https://github.com/sh123/esp32_loraprs

Last edited by user11 (2020-03-10 19:50:22)

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#2 2020-03-05 08:24:26

markqvist
Administrator
Registered: 2014-12-01
Posts: 124

Re: ESP32 LoRa APRS

Well done, and interesting work, thanks for sharing! I’ve avoided ESP32s in my own hardware designs since they seem to generate a lot of HF and VHF noise. But it could probably be mitigated with some filtering.

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