Hardware Configuration

Wiring Connections

Power pins, SPI pins, and RESET pin must be connected between arduino and LoRa module. For SX126x series and LLCC68, a BUSY pin also must be connected. If you want to use interrupt operation, you can connect DIO0 for SX127x series and one of DIO1, DIO2, or DIO3 pin for SX126x series. You also should connect TXEN and RXEN pins if your LoRa module have those pins.

The default Arduino pins used for connecting to SX126x and SX127x are as follows.

Semtech SX126x	Semtech SX127x	Arduino
VCC	VCC	3.3V
GND	GND	GND
SCK	SCK	SCK
MISO	MISO	MISO
MOSI	MOSI	MOSI
NSS	NSS	10
RESET	RESET	9
BUSY		4
DIO1	DIO0	-1 (unused)
TXEN	TXEN	-1 (unused)
RXEN	RXEN	-1 (unused)

SPI Port Configuration

To change Arduino default SPI port or SPI frequency call setSPI() method before begin() method.

LoRa.setSPI(SPI2, F_CPU/2);
LoRa.begin();

I/O Pins Configuration

To configure I/O pins (NSS, RESET, BUSY, IRQ, TXEN, RXEN pin) call setPins() before begin() method.

// set NSS->10, RESET->9, BUSY->4, DIO1->2, TXEN->8, RXEN->7 for SX126x series
LoRa.setPins(10, 9, 2, 4, 8, 7);
// set NSS->10, RESET->9, DIO0->2, TXEN->8, RXEN->7 for SX127x series
LoRa.setPins(10, 9, 2, 8, 7);
LoRa.begin();