#include "DHT.h"           //Library of DHT             |
#define DHTPIN 2           //Pin 2 for DHT Sensor       |
#define DHTTYPE DHT22      //Type of Sensor             |
DHT dht(DHTPIN, DHTTYPE);  //                           |
//------------------------------------------------------

#define trigPin 12  //Pin 12 for the Trig Pin of Ultrasonic
#define echoPin 13  //Pin 13 for the Trig Pin of Ultrasonic
int duration, distance;

const int buzzer = 9; //Pin 9 for the Buzzer



void setup() {

  //This is for the Buzzer
  pinMode(buzzer, OUTPUT);

  // This is for the Serial Monitor
  Serial.begin(9600); 

  pinMode(trigPin, OUTPUT);  //define ultrasonic trig pin as output pin
  pinMode(echoPin, INPUT);   //define ultrasonic echo as input pin
  delay(100);

  //This is for the DHT22 
  dht.begin();
}


void loop() {

// Code for DHT22

  delay(1000);

  // Reading temperature or humidity takes about 250 milliseconds!
  float h = dht.readHumidity();
  // Read temperature as Celsius 
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));


  //Code for ultra sonic
  digitalWrite(trigPin, HIGH);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;


  if (distance >= 101 && distance <= 199) {
    Serial.print("distance= ");
    Serial.print(distance);
    Serial.print('\n');
    Serial.println("Water Level is within 1-99 centimeters");
    Serial.println("----------------------------------------------");
    delay(1000);
  } else if (distance >= 200 && distance <= 299) {
    Serial.print("distance= ");
    Serial.print(distance);
    Serial.print('\n');
    Serial.println("Water Level is within 100-199 centimeters");
    Serial.println("----------------------------------------------");
    delay(1000);
  } else if (distance >= 300 && distance <= 399) {
    Serial.print("distance= ");
    Serial.print(distance);
    Serial.print('\n');
    Serial.println("Water Level is within 200-299 centimeters");
    Serial.println("----------------------------------------------");
    delay(1000);
  } else {
    Serial.print("distance= ");
    Serial.print(distance);
    Serial.print('\n');
    Serial.println("Flood Detected");
    Serial.println("Buzzer Sound......");
    Serial.println("----------------------------------------------");
    delay(1000);

    //for the Buzzer
    tone(buzzer, 1000); // Send 1KHz sound signal...
    delay(1000);        // ...for 1 sec
    noTone(buzzer);     // Stop sound...
    delay(1000);        // ...for 1sec
  }
}