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Reply To: Ra-02 (SX1278) module driven with a 5V Nano, it heats up and won't join

Translated from Türkçe by AI ·

Ayşe caught it, that’s the real issue. There are two things.Frequency: The Ra-02 is a 433 MHz module. On Hermetry the frequency plan is determined by the gateway, so if your friends’ gateway is on 868, the device also needs to be EU868. The join request sent on 433 is not heard by anyone, which is why the frames log is empty. Even if you fix the level shifting, you won’t join with this module.Voltage: As Büşra said, there’s no driving at 5V. I would do it this way: an 868 MHz SX1276 module (the RFM95W 868 version is common) and a 3.3V board. An ESP32 works, and so does a 3.3V Pro Mini. That way you don’t need a level converter. If it’s something battery-powered like a soil moisture sensor, the Pro Mini draws less current.On the Hermetry side, add the device as Class A, OTAA. In LMIC, select the EU868 region (CFG_eu868 in lmic_project_config.h), and pay attention to the byte order of DevEUI and AppEUI: LMIC wants LSB, AppKey wants MSB. Everyone gets stuck there on the first try.Regions and channels are here: Bölgeler ve frekans planları

Accepted solution♥ 7