#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 LED pins
#define RED_LED_PIN 5         // Red LED for low moisture
#define YELLOW_LED_PIN 6      // Yellow LED for moderate moisture
#define GREEN_LED_PIN 7       // Green LED for high 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 LED and buzzer pins
  pinMode(RED_LED_PIN, OUTPUT);
  pinMode(YELLOW_LED_PIN, OUTPUT);
  pinMode(GREEN_LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

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.print("Soil Moisture: ");
  Serial.print(soilMoisture);
  Serial.print("\tLight Level: ");
  Serial.print(lightLevel);
  Serial.print("\tTemperature: ");
  Serial.print(temperature);
  Serial.print("°C\tHumidity: ");
  Serial.print(humidity);
  Serial.println("%");

  // Detect day or night using LDR
  bool isDaytime = lightLevel > 300;  // Example threshold for detecting daytime

  // Adjust soil moisture threshold based on temperature
  bool isSoilMoistureGood;
  if (temperature > 30) {  // Adjust threshold in high temperature
    isSoilMoistureGood = soilMoisture > 400;
  } else {
    isSoilMoistureGood = soilMoisture > 300;  // Normal threshold
  }

  // Determine healthy temperature and humidity ranges
  bool isTemperatureGood = temperature >= 18 && temperature <= 25;
  bool isHumidityGood = humidity >= 40 && humidity <= 70;

  // Soil moisture range conditions with LED alerts
  if (soilMoisture < 300) {  // Low moisture (dry soil)
    digitalWrite(RED_LED_PIN, HIGH);   // Turn on Red LED
    digitalWrite(YELLOW_LED_PIN, LOW); // Turn off Yellow LED
    digitalWrite(GREEN_LED_PIN, LOW);  // Turn off Green LED
    Serial.println("Soil is dry! (Low moisture)");
  } else if (soilMoisture >= 300 && soilMoisture <= 700) {  // Moderate moisture
    digitalWrite(RED_LED_PIN, LOW);    // Turn off Red LED
    digitalWrite(YELLOW_LED_PIN, HIGH);// Turn on Yellow LED
    digitalWrite(GREEN_LED_PIN, LOW);  // Turn off Green LED
    Serial.println("Soil is moist! (Moderate moisture)");
  } else {  // High moisture (well-watered)
    digitalWrite(RED_LED_PIN, LOW);    // Turn off Red LED
    digitalWrite(YELLOW_LED_PIN, LOW); // Turn off Yellow LED
    digitalWrite(GREEN_LED_PIN, HIGH); // Turn on Green LED
    Serial.println("Soil is well-watered! (High moisture)");
  }

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

    // Environment-specific alerts
    if (!isSoilMoistureGood && humidity < 40) {
      Serial.println("Soil moisture is low and humidity is low; consider watering.");
      digitalWrite(BUZZER_PIN, HIGH);  // Buzzer alert for low moisture and humidity
    } else if (!isSoilMoistureGood) {
      Serial.println("Soil is dry, but humidity is high; monitor closely.");
      digitalWrite(BUZZER_PIN, LOW);   // No buzzer alert if only moisture is low but humidity is high
    }
    
    if (!isTemperatureGood) {
      Serial.println("Temperature is outside the healthy range!");
      if (isDaytime) digitalWrite(BUZZER_PIN, HIGH);  // Only alert during daytime
    }
    
    if (!isHumidityGood) {
      Serial.println("Humidity is outside the healthy range!");
      if (isDaytime) digitalWrite(BUZZER_PIN, HIGH);  // Only alert during daytime
    }
  }

  // Heat wave alert
  if (temperature > 35) {
    Serial.println("Heat wave alert! Temperature is extremely high.");
    digitalWrite(BUZZER_PIN, HIGH);  // Buzzer alert for heat wave
  }

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