ESP32 OLED Weather Clock

#include <WiFi.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_BME280.h>
#include <time.h>

#define I2C_SDA 21
#define I2C_SCL 22
#define OLED_ADDRESS 0x3C
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

const char* ssid = "YOUR_WIFI";
const char* password = "YOUR_PASSWORD";

// NTP supplies UTC. Set these values for your local time zone.
const long GMT_OFFSET_SEC = 0;
const int DAYLIGHT_OFFSET_SEC = 0;

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
Adafruit_BME280 bme;
bool bmeReady = false;

void showMessage(const char* line1, const char* line2) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println(line1);
  display.println(line2);
  display.display();
}

bool beginBME280() {
  if (bme.begin(0x76)) return true;
  if (bme.begin(0x77)) return true;
  return false;
}

void setup() {
  Serial.begin(115200);
  Wire.begin(I2C_SDA, I2C_SCL);

  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDRESS)) {
    Serial.println("SSD1306 not found. Check address, power, SDA, and SCL.");
    while (true) delay(1000);
  }

  showMessage("OLED Weather Clock", "Connecting WiFi...");

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(300);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("WiFi connected: ");
  Serial.println(WiFi.localIP());

  configTime(GMT_OFFSET_SEC, DAYLIGHT_OFFSET_SEC, "pool.ntp.org", "time.nist.gov");

  bmeReady = beginBME280();
  Serial.println(bmeReady ? "BME280 ready" : "BME280 not found");
  showMessage("Clock ready", bmeReady ? "BME280 ready" : "Check BME280");
  delay(1200);
}

void loop() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    Serial.println("Waiting for NTP time...");
    showMessage("NTP sync", "Waiting...");
    delay(1000);
    return;
  }

  char timeText[6];
  char dateText[18];
  strftime(timeText, sizeof(timeText), "%H:%M", &timeinfo);
  strftime(dateText, sizeof(dateText), "%a %d %b", &timeinfo);

  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(2);
  display.setCursor(0, 0);
  display.println(timeText);

  display.setTextSize(1);
  display.setCursor(0, 22);
  display.println(dateText);

  if (bmeReady) {
    display.print("Temp: ");
    display.print(bme.readTemperature(), 1);
    display.println(" C");
    display.print("Hum:  ");
    display.print(bme.readHumidity(), 0);
    display.println(" %");
    display.print("Pres: ");
    display.print(bme.readPressure() / 100.0F, 0);
    display.println(" hPa");
  } else {
    display.println("BME280 not found");
    display.println("Clock only mode");
  }

  display.display();
  delay(2000);
}