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Reads temperature and humidity with DHT22, shows live data on OLED, and uploads to ThingSpeak or Blynk dashboard over WiFi for remote monitoring and graphing.
Specifications
| Microcontroller | ESP32 DevKit v1 |
| Sensor | DHT22 (±0.5°C accuracy, ±2% RH) |
| Display | OLED 0.96" SSD1306 (I2C) |
| Connectivity | WiFi 802.11 b/g/n |
| Dashboard | ThingSpeak (free) or Blynk 2.0 (free tier) |