ESP32 Sensor Data Logger with ThingSpeak

This project reads sensor data from BMP280 (pressure & temperature), SHT41 (temperature & humidity), and GUVA-S12SD (UV light sensor) connected to an ESP32, then uploads the data to ThingSpeak via WiFi.

Features

• Reads temperature, humidity, and pressure from BMP280 and SHT41 sensors
• Sends sensor data to ThingSpeak channel fields
• Automatically reconnects to WiFi if connection drops
• Configurable update interval (default 60 seconds)

Hardware Requirements

• ESP32 development board
• BMP280 sensor (I2C)
• SHT41 sensor (I2C)
• Connecting wires

Software Requirements

• Arduino IDE with ESP32 board support installed
• Libraries:
  • ThingSpeak
  • WiFi
  • BMP280 (your specific BMP280 library)
  • SHT41 (your specific SHT41 library)

Wiring

Sensor	ESP32 Pin
BMP280 SDA	GPIO 21 (SDA)
BMP280 SCL	GPIO 22 (SCL)
SHT41 SDA	GPIO 21 (SDA)
SHT41 SCL	GPIO 22 (SCL)

Note: BMP280 and SHT41 share I2C lines.

Configuration

Update the following variables in the code:

const char* ssid = "YOUR_SSID";                // Your WiFi network name
const char* password = "YOUR_PASSWORD";        // Your WiFi password

const char* writeAPIKey = "YOUR_WRITE_API_KEY"; // ThingSpeak Write API Key
unsigned long channelNumber = YOUR_CHANNEL_NUMBER; // ThingSpeak Channel Number