The RFM95W-915S2 Development board is a PCB that contains a RFM95W LoRa transceiver, a U.FL connector for the external antenna, a decoupling capacitor and a group of headers connected to the different pins of the transceiver. The transceiver can be used as a sender or a receiver.

This log describes the initial tests that were performed using the RFM95W-915S2 Development board.

Wiring for the Tests

The webpage randomnerdtutorials.com has an amazing tutorial named ESP32 with LoRa using Arduino IDE – Getting Started, that tutorial contains detailed information about how to use the RFM95 with an ESP32 (the same microcontroller that was selected for our designs). I used the same firmware and connections provided by the tutorial. 

The test requires 2 transceivers, one of them will be used as a sender and the other as a receiver. In this case, one of the transceivers is the  RFM95W-915S2 Development board and the other one is the RFM95W transceiver from Adafruit.

The connections are the following:

Firmware

The firmware can be found in the following Github repository. The repository contains a folder named /Firmware/ that contains the project for the transceiver as a receiver and a sender.  

Both of the RFM95W Boards were used as a sender and receiver, the result was successful in both cases. During the test, one of the transceivers sends the package "hello counter", where the counter is a number that goes from 0 to 32767. The other transceiver receives the package and prints the message through serial.

Requisites:

1. ESP32 Add-on in Arduino IDE
2. LoRa Library

Results visualized in the serial monitor from the receiver circuit:

For more information about the firmware visit the original tutorial for the RFM95W.