An Arduino-based weather display project using ESP32, CO₂ sensor (MH-Z19B), BME280, and a graphic LCD. Also fetches real-time from NTP or HTTPS API (timeapi.io) and shows current time, date, and weekday.
- 🕒 Real-time clock via NTP or HTTPS API
- 🌡️ BME280 for temperature and humidity
- 🫁 MH-Z19B for indoor CO₂ monitoring
- 🖥️ U8g2 graphics display (128x64 LCD)
- 📊 Historical graphs for temperature, humidity, and CO₂
- 📦 Wi-Fi support for internet time sync
⚠️ Alerts on high CO₂ levels with RGB feedback
- ESP32 DevKit v1
- BME280
- MH-Z19B
- LCD 128x64 (ST7565 via SPI)
- 2x push buttons
- RGB LED (optional)
- [email protected]: https://github.com/GyverLibs/GyverBME280
- [email protected]: https://github.com/olikraus/u8g2
- [email protected]: https://github.com/GyverLibs/EncButton
- [email protected]: https://github.com/nara256/mhz19_uart
- [email protected]: https://github.com/GyverLibs/GRGB
- [email protected]: https://github.com/bblanchon/ArduinoJson
| Component | ESP32 Pin |
|---|---|
| BME280 | SDA: 21, SCL: 22 |
| MH-Z19B | RX: 17, TX: 16 |
| LCD (SPI) | SCL: 18, SI: 23, CS: 5, RS: 15, RSE: 4 |
| Buttons | 34, 35 |
| Backlight | 13 |
⚠️ MH-Z19 sensor connections are logically swapped in code (TX == 17, RX == 16)!
const char* ssid = "YourNetwork";
const char* password = "YourPassword";
const char* timeZone = "CET-1CEST,M3.5.0/2,M10.5.0/3"; // Belgrade
const char* rootCACert = R"rawliteral(
-----BEGIN CERTIFICATE-----
... your CA certificate here ...
-----END CERTIFICATE-----
)rawliteral";
⚠️ Don’t forget to add secrets.h to your .gitignore.
Button 1: Change screen
Button 2: Manual data update
Button 3: (optional) Future use
- 📊 Main screen: time, date, indoor temp/humidity
- 🌤 Weather forecast (optional)
- 📈 Graphs: CO₂, Temp, Humidity (24h)