ESP32-WiFiManager-HTTPS-Client

ESP32 project that automatically manages WiFi connections and sends sensor data to a server via HTTPS.

Features

• Auto WiFi Management: Connects using saved credentials or opens a captive portal for setup
• HTTPS Data Transmission: Securely sends JSON data to your server with API key authentication
• Dual Data Streams: Sends both environmental data (temperature, humidity) and water quality data (pH, dissolved oxygen, etc.)
• Retry Logic: Automatically retries failed connections with exponential backoff
• Reset Function: Press EN button to clear saved WiFi credentials

How it Works

1. WiFi Setup: On first boot, creates "ESP32_AP" hotspot for WiFi configuration
2. Auto Connect: Remembers WiFi settings and connects automatically on subsequent boots
3. Data Collection: Reads sensor values (currently hardcoded for testing)
4. HTTPS POST: Sends data to two endpoints: /env_data and /pond_data
5. Error Handling: Retries failed connections up to 4 times with increasing delays

Configuration

Update these values in the code:

const char* server = "your-server.example.com";
const char* apiKey = "YOUR_API_KEY";

Use Cases

• Environmental Monitoring: Temperature, humidity, pressure sensing
• Water Quality Monitoring: pH, dissolved oxygen, TDS measurement for ponds/aquariums
• IoT Data Logger: Any application requiring secure data transmission to a server
• Remote Monitoring: Monitor sensors from anywhere with internet connection

JSON Data Format

Environmental Data:

{
  "api_key": "YOUR_API_KEY",
  "sensor": "SHT20",
  "Temperature": 22.3,
  "Humidity": 55.2,
  "Pressure": 0
}

Water Quality Data:

{
  "api_key": "YOUR_API_KEY",
  "nitrogen": 0.0,
  "ammonia": 0.0,
  "do": 7.2,
  "waterPH": 7.1,
  "waterTemp": 26.4
}

Installation

1. Install required libraries: WiFiManager and ArduinoJson
2. Update server URL and API key in the code
3. Upload to ESP32
4. Connect to "ESP32_AP" hotspot and configure WiFi

Screenshots

Libraries Used

• WiFiManager - For easy WiFi configuration
• ArduinoJson - For JSON data formatting
• WiFiClientSecure - For HTTPS connections