Hardware Configuration

Hardware Configuration

Wiring Connections

Power pins, SPI pins, RESET, and BUSY pins must be connected between host controller and LoRa module. If you want to use interrupt operation, you can connect one of DIO1, DIO2, or DIO3 pin. You also should connect TXEN and RXEN pins if your LoRa module have those pins.

The default SPI port is using bus id 0 and cs id 0. The default GPIO pins used for connecting to SX126x with Broadcom pin numbering are as follows.

Semtech SX126x	Raspberry Pi
VCC	3.3V
GND	GND
SCK	GPIO 11
MISO	GPIO 9
MOSI	GPIO 10
NSS	GPIO 8
RESET	GPIO 22
BUSY	GPIO 23
DIO1	-1 (unused)
TXEN	-1 (unused)
RXEN	-1 (unused)

SPI Port Configuration

To configure SPI port or SPI frequency call setSPI() method before begin() method.

# set to use SPI with bus id 0 and cs id 1 and speed 7.8 Mhz
LoRa.setSPI(0, 0, 7800000)
LoRa.begin()

I/O Pins Configuration

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

# set RESET->22, BUSY->23, DIO1->26, TXEN->5, RXEN->25
LoRa.setPins(22, 23, 26, 5, 25)
LoRa.begin()

Current Protection

RF IRQ Pin

DIO2 as Switch

DIO3 as TCXO Control

XTAL Capacitor

Voltage Regulator

Oscillator