#define BLYNK_TEMPLATE_ID "TMPL6UugwFIUZ"
#define BLYNK_TEMPLATE_NAME "Flood Level Monitor"
#define BLYNK_AUTH_TOKEN "6Pd-BykyvudxFxeZgYKeEmRL5LfPkG1a"

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>


LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address for 16x2 LCD
const int triggerPin = 14; // Ultrasonic sensor trigger pin
const int echoPin = 12;   // Ultrasonic sensor echo pin
const int buzzerPin = 5;  // Buzzer pin

const int greenLED = 15;   // Green LED pin
const int yellowLED = 2;  // Yellow LED pin
const int redLED = 4;
const int LED = 18; 
const int floatSwitch = 13;    // Red LED pin

const int maxDistance = 400; 

BlynkTimer timer;

// Enter your Auth token
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Salman";
char pass[] = "1234salman";

long duration, distance;


void sendSensor() {
    if(distance < 50){
    Serial.print("Notification sent");
    Blynk.logEvent("water_level", "Flood detected");
    }
} 

void setup() {
  Serial.begin(1000);
  Blynk.begin(auth, ssid, pass);
  Wire.begin(21, 22);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("FLOOD MONITORING");
  lcd.setCursor(2, 1);
  lcd.print(" SYSTEM");
  delay(1000);
  lcd.clear();

  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  
  pinMode(greenLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  pinMode(LED, OUTPUT);
   timer.setInterval(2500L, sendSensor);
  
}

void ultrasonic() {
  
  // Trigger the ultrasonic sensor
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);

  // Measure the time it takes for the pulse to return
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in centimeters
  distance = (duration / 2) / 29.1;
  
  Serial.println(duration);
  Serial.println(distance);
  
  int blynkDistance = ((distance - maxDistance) * -1) / 3;
  if (distance <= maxDistance) {
    Blynk.virtualWrite(V0, blynkDistance);
  } else {
    Blynk.virtualWrite(V0, 0);
  }

  // Determine the water level description
  String waterLevel = "Unknown";

  if (distance < 100 && distance > 50) {
  Serial.println("Alert");
    waterLevel = "RED ALERT";
    digitalWrite(greenLED, LOW);
    digitalWrite(yellowLED, LOW);
    digitalWrite(redLED, HIGH);
    digitalWrite(buzzerPin, HIGH);
    tone(buzzerPin, 1000);
    delay(200);
    digitalWrite(buzzerPin, LOW);
    tone(buzzerPin, 500);
    delay(200);
  } 
  else if (distance < 50) {
    waterLevel = "DANGER ";
    Serial.println("Danger");
    digitalWrite(greenLED, LOW);
    digitalWrite(yellowLED, HIGH);
    digitalWrite(redLED, LOW);
    
    for (int i = 0; i < 3; i++) {  // Play the following sequence 3 times
      digitalWrite(buzzerPin, HIGH);
      tone(buzzerPin, 200);
      delay(200);
      digitalWrite(buzzerPin, LOW);
      tone(buzzerPin, 1000);
      delay(200);
      
      digitalWrite(buzzerPin, HIGH);
      tone(buzzerPin, 200);
      delay(200);
      digitalWrite(buzzerPin, LOW);
      tone(buzzerPin, 1000);
      delay(200);
    }

    digitalWrite(buzzerPin, HIGH);
    tone(buzzerPin, 200);
    delay(1000);
    digitalWrite(buzzerPin, LOW);
  }

    
  else if(distance > 100){
    waterLevel = "NORMAL";
    Serial.println("Normal");
    digitalWrite(greenLED, HIGH);
    digitalWrite(yellowLED, LOW);
    digitalWrite(redLED, LOW);
    digitalWrite(buzzerPin, LOW);
    noTone(buzzerPin);
    delay(1000);
    
  }

  // Display the water level and distance on the LCD with proper formatting
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("ALERT: ");
  lcd.print(waterLevel);
  lcd.setCursor(2, 1);
  lcd.print("LEVEL: ");
  lcd.print(distance);
  lcd.print(" cm");

}

void loop() {
  ultrasonic();
  Blynk.run(); // Run the Blynk library
  timer.run(); // Run the timer
}