firmware/variants/heltec_wsl_v3/variant.h

#define I2C_SCL SCL
#define I2C_SDA SDA

#define LED_PIN LED

#define HAS_SCREEN 0

#define VEXT_ENABLE Vext // active low, powers the oled display and the lora antenna boost
#define BUTTON_PIN 0

#define BATTERY_PIN 1 // A battery voltage measurement pin, voltage divider connected here to measure battery voltage
#define ADC_CHANNEL ADC1_GPIO1_CHANNEL
#define ADC_ATTENUATION ADC_ATTEN_DB_2_5 // lower dB for high resistance voltage divider
#define ADC_MULTIPLIER 4.9

#define USE_SX1262

#define LORA_DIO0 -1 // a No connect on the SX1262 module
#define LORA_RESET 12
#define LORA_DIO1 14 // SX1262 IRQ
#define LORA_DIO2 13 // SX1262 BUSY
#define LORA_DIO3    // Not connected on PCB, but internally on the TTGO SX1262, if DIO3 is high the TXCO is enabled

#define RF95_SCK 9
#define RF95_MISO 11
#define RF95_MOSI 10
#define RF95_NSS 8

#define SX126X_CS RF95_NSS
#define SX126X_DIO1 LORA_DIO1
#define SX126X_BUSY LORA_DIO2
#define SX126X_RESET LORA_RESET

#define SX126X_DIO2_AS_RF_SWITCH
#define SX126X_DIO3_TCXO_VOLTAGE 1.8