#define TRIGGER_PIN 3    // Ultrasonic Sensor trigger pin (D3)
#define ECHO_PIN 2       // Ultrasonic Sensor echo pin (D2)
#define DHT_PIN 4        // DHT22 Sensor signal pin (D4)
#define BUZZER_PIN 6     // Buzzer pin (D6)
#define LED1_PIN 0       // LED1 pin (D0)
#define LED2_PIN 1       // LED2 pin (D1)
#define LED3_PIN 7       // LED3 pin (D7)
#define WATER_QUALITY_PIN A0 // Water quality sensor analog pin

#define MAX_DISTANCE 200     // Maximum distance to measure (in cm)
#define MIN_WATER_LEVEL 10   // Minimum water level threshold (in cm)
#define MAX_WATER_LEVEL 50   // Maximum water level threshold (in cm)
#define TEMPERATURE_THRESHOLD 25.0 // Temperature threshold (in Celsius)
#define HUMIDITY_THRESHOLD 60.0    // Humidity threshold (in %)
#define WATER_QUALITY_THRESHOLD 400 // Water quality threshold (adjust as needed)

#include <DHT.h>

DHT dht(DHT_PIN, DHT22); // DHT22 sensor instance

void setup() {
  Serial.begin(9600);
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED1_PIN, OUTPUT);
  pinMode(LED2_PIN, OUTPUT);
  pinMode(LED3_PIN, OUTPUT);
  dht.begin();
}

void loop() {
  // Read distance from ultrasonic sensor
  long duration, cm;
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  cm = duration / 58; // Convert echo time to distance in cm

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

  // Read analog value from water quality sensor
  int waterQualityValue = analogRead(WATER_QUALITY_PIN);

  // Check if readings are valid
  if (cm > 0 && temperature >= 0 && humidity >= 0) {
    // Check water level
    if (cm >= MIN_WATER_LEVEL && cm <= MAX_WATER_LEVEL) {
      // Water level within acceptable range
      digitalWrite(LED1_PIN, HIGH); // Turn on LED1
      digitalWrite(BUZZER_PIN, LOW); // Turn off buzzer
    } else {
      // Water level below minimum or above maximum threshold
      digitalWrite(LED1_PIN, LOW); // Turn off LED1
      digitalWrite(BUZZER_PIN, HIGH); // Turn on buzzer
    }

    // Check temperature
    if (temperature >= TEMPERATURE_THRESHOLD) {
      // Temperature above threshold
      digitalWrite(LED2_PIN, HIGH); // Turn on LED2
    } else {
      // Temperature below threshold
      digitalWrite(LED2_PIN, LOW); // Turn off LED2
    }

    // Check humidity
    if (humidity >= HUMIDITY_THRESHOLD) {
      // Humidity above threshold
      digitalWrite(LED3_PIN, HIGH); // Turn on LED3
    } else {
      // Humidity below threshold
      digitalWrite(LED3_PIN, LOW); // Turn off LED3
    }

    // Check water quality
    if (waterQualityValue >= WATER_QUALITY_THRESHOLD) {
      // Water quality above threshold
      Serial.println("Water quality is good");
      // Add corresponding actions here
    } else {
      // Water quality below threshold
      Serial.println("Water quality is poor");
      // Add corresponding actions here
    }

    // Print readings to Serial Monitor
    Serial.print("Distance: ");
    Serial.print(cm);
    Serial.print(" cm, Temperature: ");
    Serial.print(temperature);
    Serial.print(" °C, Humidity: ");
    Serial.print(humidity);
    Serial.print("%, Water Quality: ");
    Serial.println(waterQualityValue);
  } else {
    // Invalid readings, print error message
    Serial.println("Error: Invalid readings");
  }

  delay(1000); // Delay before next reading
}