Documentation

1. In Arduino IDE -> Preferences, add this Boards Manager URL:
   https://resource.heltec.cn/download/package_heltec_esp32_index.json

2. Tools -> Board -> Boards Manager -> install "Heltec ESP32 Series Dev-boards"

3. Tools -> Board -> Heltec ESP32 Arduino -> "WiFi LoRa 32(V3)"

4. Tools -> Port -> (your CP2102 USB-C port)

5. Install the Heltec_ESP32 library via Library Manager.

// Heltec WiFi LoRa 32 V3 - OLED "Hello World"

#include <Wire.h>
#include <HT_SSD1306Wire.h>

SSD1306Wire display(0x3c, 500000, SDA_OLED, SCL_OLED, GEOMETRY_128_64, RST_OLED);

void setup() {
  pinMode(Vext, OUTPUT);
  digitalWrite(Vext, LOW);   // power on Vext rail
  delay(50);

  display.init();
  display.setFont(ArialMT_Plain_16);
  display.drawString(0, 0, "Hello,");
  display.drawString(0, 20, "ShillehTek!");
  display.drawString(0, 40, "WiFi LoRa V3");
  display.display();
}

void loop() {}

// Heltec WiFi LoRa 32 V3 - send and receive
// Library: RadioLib by jgromes

#include <RadioLib.h>

// SX1262 mapping for V3: NSS=8, DIO1=14, RST=12, BUSY=13
SX1262 lora = new Module(8, 14, 12, 13);

void setup() {
  Serial.begin(115200);
  int state = lora.begin(915.0);   // 868.0 in EU
  if (state != RADIOLIB_ERR_NONE) {
    Serial.printf("LoRa init failed: %d\n", state);
    while (true) delay(10);
  }
  Serial.println("LoRa ready");
}

void loop() {
  // TX:
  int s = lora.transmit("Hello from V3!");
  Serial.println(s == RADIOLIB_ERR_NONE ? "Sent OK" : "Send failed");

  // RX (blocking, 5s timeout):
  String msg;
  s = lora.receive(msg, 5000);
  if (s == RADIOLIB_ERR_NONE) {
    Serial.print("Got: "); Serial.println(msg);
  }
  delay(2000);
}

// Heltec V3 - connect to WiFi and print IP

#include <WiFi.h>

const char* ssid = "YOUR_SSID";
const char* pass = "YOUR_PASS";

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500); Serial.print(".");
  }
  Serial.println();
  Serial.print("IP: "); Serial.println(WiFi.localIP());
}

void loop() {}