#include <DHT.h>

// Define sensor pins
#define SOIL_MOISTURE_PIN A0  // Soil moisture sensor analog pin
#define LDR_PIN A1            // LDR analog pin
#define DHT_PIN 2             // DHT22 data pin
#define BUZZER_PIN 3          // Buzzer digital pin
#define RED_LED_PIN 5         // Red LED for low soil moisture
#define BLUE_LED_PIN 6        // Blue LED for moderate soil moisture
#define GREEN_LED_PIN 7       // Green LED for good soil moisture

// Initialize DHT sensor
#define DHTTYPE DHT22         // DHT 22 (AM2302)
DHT dht(DHT_PIN, DHTTYPE);

void setup() {
  // Initialize Serial Monitor
  Serial.begin(9600);

  // Initialize DHT sensor
  dht.begin();

  // Initialize buzzer and LED pins
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(BLUE_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);

  // Start with all LEDs and buzzer off
  digitalWrite(RED_LED_PIN, LOW);
  digitalWrite(BLUE_LED_PIN, LOW);
  digitalWrite(GREEN_LED_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);

  Serial.println("Smart Plant Monitoring System Initialized");
}

void loop() {
  // Read soil moisture sensor data
  int soilMoisture = analogRead(SOIL_MOISTURE_PIN);

  // Read light sensor (LDR) data
  int lightLevel = analogRead(LDR_PIN);

  // Read temperature and humidity from DHT22 sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Display sensor readings on Serial Monitor
  Serial.println("==============================");
  Serial.print("Soil Moisture: ");
  Serial.println(soilMoisture);
  Serial.print("Light Level: ");
  Serial.println(lightLevel);
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println("%");

  // Healthy Plant Conditions
  bool isSoilMoistureGood = (soilMoisture > 300 && soilMoisture <= 700);
  bool isTemperatureGood = (temperature >= 18 && temperature <= 25); // Ideal plant temperature
  bool isHumidityGood = (humidity >= 40 && humidity <= 70);          // Ideal humidity range

  // Determine soil moisture levels and LED indicators
  if (soilMoisture < 300) { // Dry soil
    digitalWrite(RED_LED_PIN, HIGH);
    digitalWrite(BLUE_LED_PIN, LOW);
    digitalWrite(GREEN_LED_PIN, LOW);
    Serial.println("Soil is dry! (Low moisture)");
  } else if (soilMoisture > 300 && soilMoisture <= 700) { // Moderate moisture
    digitalWrite(RED_LED_PIN, LOW);
    digitalWrite(BLUE_LED_PIN, HIGH);
    digitalWrite(GREEN_LED_PIN, LOW);
    Serial.println("Soil is moist! (Moderate moisture)");
  } else { // Well-watered soil
    digitalWrite(RED_LED_PIN, LOW);
    digitalWrite(BLUE_LED_PIN, LOW);
    digitalWrite(GREEN_LED_PIN, HIGH);
    Serial.println("Soil is well-watered! (High moisture)");
  }

  // Check overall plant health and buzzer alert
  if (isSoilMoistureGood && isTemperatureGood && isHumidityGood) {
    Serial.println("The plant environment is healthy.");
    digitalWrite(BUZZER_PIN, LOW); // Turn off buzzer
  } else {
    Serial.println("Warning: The plant environment needs attention!");

    if (!isSoilMoistureGood) {
      Serial.println("- Soil moisture is not optimal.");
      digitalWrite(BUZZER_PIN, HIGH); // Turn on buzzer
    }
    if (!isTemperatureGood) {
      Serial.println("- Temperature is outside the healthy range.");
      digitalWrite(BUZZER_PIN, HIGH); // Turn on buzzer
    }
    if (!isHumidityGood) {
      Serial.println("- Humidity is outside the healthy range.");
      digitalWrite(BUZZER_PIN, HIGH); // Turn on buzzer
    }
  }

  delay(2000); // Wait 2 seconds before the next reading
}