Environmental Monitoring System

This project is a real-time IoT-based Environmental Monitoring System using ESP32 microcontrollers, which measures and transmits sensor data including:

• Temperature and Humidity (DHT22)
• Pressure (BMP280)
• Current and Voltage (ACS712)
• Air Quality/Gas Concentration (MQ135)

Core Components

• ESP32 Slave: Collects sensor data and sends it via MODBUS RTU protocol.
• ESP32 Master: Receives the data and publishes it using MQTT protocol to a Node.js server.
• Node.js Server: Stores data into MongoDB using Mongoose, and communicates via the HiveMQ broker.
• DWIN Touch Display: Displays data using DGUS GUI interface, built with HTML/CSS and JavaScript.

Technologies Used

• Arduino IDE with ESP32
• MODBUS RTU Protocol
• MQTT Protocol (HiveMQ broker)
• Node.js + Express + Mongoose
• MongoDB
• DGUS Software for DWIN display

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For detailed design, setup, and explanation:

• 📄 See Project_Report.pdf
• 🖼️ See Project_Poster.pdf
• 💻 Final code is available in:
  • Final_Master.ino
  • Final_Slave.ino