🌿 Smart Greenhouse on Arduino

📋 Description

This project is a smart greenhouse system based on the Arduino Mega platform.
It integrates multiple features: RFID and keypad access control, automatic lighting, climate control, irrigation, and IR remote management.

It’s designed for learning and experimenting with RFID, EEPROM, servo motors, DHT sensors, photoresistors, and more.

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⚙️ Features

• 🔐 Access Control:

  • Up to 10 RFID cards stored in EEPROM
  • 4-digit PIN code input via 4x4 keypad
  • Internal unlock button

• 🌞 Smart Light and Sun Tracking:

  • 3 photoresistors detect light intensity
  • Servo motor rotates the panel toward the light
  • LED lighting turns on automatically in low light

• 🌡️ Climate Monitoring:

  • Temperature and humidity detection using DHT11
  • Fan automatically turns on when temperature exceeds threshold

• 💧 Auto Watering:

  • Analog water level sensor
  • Pump activates if water level is below threshold

• 🎮 IR Remote Control:

  • Adjust temperature and water thresholds
  • Display infrared signal response

• 📟 LCD Interface:

  • 16x2 LCD displays temperature, humidity, water level, and door state

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🔌 Hardware Components

Component	Purpose
Arduino Mega	Main microcontroller
MFRC522	RFID card reader
DHT11	Temperature and humidity sensor
LCD 16x2	Displays system info
IR Receiver	Accepts signals from remote
4x4 Keypad	Enters PIN code
SG90 Servo (x2)	For door lock and solar panel tracking
Photoresistors (x3)	Detect ambient light
Relay Module	Controls door lock
Buzzer	Sound indication
EEPROM	Stores RFID cards

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📟 LCD Display Output

• H: Humidity (%)
• T: Temperature (°C)
• D: Door status (Open or Lock)
• WL: Water level (0–100 range)

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🧠 Code Structure

• lock() / unlock()
  Lock and unlock the door via servo motor

• indicate(type)
  LED + buzzer indication for SUCCESS, DECLINE, SAVED, or DELETED

• saveOrDeleteTag()
  Adds or deletes an RFID tag to/from EEPROM

• compareUIDs()
  Compares two RFID UIDs byte-by-byte

• foundTag()
  Checks if the scanned RFID exists in EEPROM

• loop()
  Main logic for automatic control of light, water, ventilation, and access

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📦 Required Libraries

• Servo.h
• SPI.h
• MFRC522.h
• EEPROM.h
• LiquidCrystal.h
• Wire.h
• dht11.h
• GyverHacks.h
• IRremote.h
• Keypad.h

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🛠️ Possible Improvements

• 📱 Add ESP8266 or ESP32 for Wi-Fi-based monitoring and control
• 📊 Send real-time data to a server or mobile app (e.g., Telegram bot)
• 📈 Log historical temperature/humidity graphs
• 🔔 Add notifications for abnormal conditions (e.g., high temp or low water)