🔌 ESP32 Smart LED Control System via MQTT

🌡️ Overview

This project uses an ESP32 to monitor temperature via an NTC thermistor and control a relay-connected LED in two operating modes:

🔁 Auto Mode

• Relay (and LED) turns ON if the temperature exceeds a defined threshold.
• Relay turns OFF when the temperature drops below the threshold.

🎮 Manual Mode

• Relay can be turned ON/OFF remotely using MQTT commands from a PC or another MQTT client.

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🔧 Setup

📱 ESP32 (MicroPython)

1. Copy esp32_code/main.py to your ESP32.
2. Connect hardware:
   • NTC Thermistor + 10kΩ resistor as a voltage divider → GPIO34
   • Relay Module control pin → GPIO2
   • LED connected between NO–COM on the relay
3. Run the code on ESP32.
4. Open Serial Monitor to verify:
   • ✅ Wi-Fi connection
   • ✅ MQTT broker connectivity

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💻 PC (Python MQTT Controller)

1. Install required library:

   pip install paho-mqtt