This guide will instruct you to create a DIY LoRaWAN node using ESP32, RFM95 module and RadioLib.

  • The guide is applicable to all ESP32 variant and RFM95 module with minor difference.
  • The guide uses ESP32 Dev Module and RFM95 for 915/923Mhz.
  • The node will support LoRaWAN 1.1.0, Class A and uplink/downlink feature. LoRaWAN 1.0.x is still backward supported. Class B and C are not supported yet.
  • Product link: ESP32 and RFM95. AIThinker Ra01/02/01h is supported too.
  • Source code: From Easy LoRaWAN.

ESP32 Dev Module:

HopeRF RFM95

AI-Thinker ra01/02/01h

Step 1: To wire LoRa module to ESP32 as below

  •  LORA_SS              25 // Must have pull up resistor
  •  LORA_SCK           18 // Default SCK for VSPI in ESP32
  •  LORA_MOSI         23 // Default MOSI for VSPI in ESP32
  •  LORA_MISO         19 // Default MISO for VSPI in ESP32
  •  LORA_DIO0          26
  •  LORA_DIO1          35
  •  LORA_DIO2          34
  •  LORA_RESET       27

Step 2: Install softwares and libraries

  • To install Arduino IDE at here
  • To add Arduino support for ESP32: here
  • To install UART driver: Check section B2 here

Step 3: To import RadioLib library

Step 4: To download source code at the top of the guide

Step 5: To modify GPIOs  to fit your board wiring in config.h

  • To use SX1276 for EU868, US915, AU915, AS923, AS923_2, AS923_3 and AS923_4
  • To use Sx1278 for CN470

Step 6: To change your JOIN_EUI, APP_KEY, NWK_KEY and Region

Step 7: Upload the code to the node

Step 8: To configure your gateways and LoRaWAN server

Step 9: After step 8, you can see the node sending uplink data to server and receiving downlink data from the server.

Enjoy.

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