DFRobot Gravity LoRaWAN Node Module EU868 (SX1262)

Connect the module's PH2.0 connector to your Arduino using the included cable, linking the UART TX/RX pins to a software serial port (e.g., pins 10 & 11). Power the module from the Arduino's 3.3V or 5V pin, ensuring common ground. Use the DFRobot Gravity library or Generic SX1262 libraries to send AT commands over serial for LoRaWAN configuration, setting parameters like DevEUI, AppEUI, and AppKey for network joining.

In LoRa point-to-point mode, the module communicates directly with another LoRa device using configured frequency, spreading factor, and bandwidth, ideal for simple peer-to-peer links. LoRaWAN mode connects the module to a LoRaWAN gateway and network server (like TTN), handling secure join procedures, adaptive data rate (ADR), and MAC commands. Switch modes via AT commands; LoRaWAN is for scalable network deployments, while point-to-point is for direct device communication.

The SX1262 chip offers low receive current (~5 mA) and configurable transmit current. For battery life, utilize the module's deep sleep modes via AT commands, waking only for scheduled transmissions. Optimize LoRa parameters: use the highest spreading factor and lowest bandwidth acceptable for your range needs to minimize on-air time. Power the module from a 3.3V source and ensure your host MCU also enters sleep, waking via timer or interrupt to trigger a sensor reading and brief LoRa transmission.

The hardware is locked to the EU868 frequency band (863-870 MHz); using it in other regions like US915 or AS923 may violate local radio regulations. For legal operation outside Europe, you must source a module variant certified for that specific region's ISM band. Configuration for different channels within EU868 is done via AT commands (e.g., AT+CH) to set the frequency, but the fundamental RF hardware is designed for the EU spectrum.