//Flood Monitoring & Early warning system ~ IOT (Group-5)
//<LiquidCrystal.h> is the library for using the LCD 16x2
#include <LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);  // Create an instance of the LiquidCrystal library
const int in = 8;                         // This is the ECHO pin of The Ultrasonic sensor HC-SR04
const int out = 9;                        // This is the TRIG pin of the ultrasonic Sensor HC-SR04
// Define pin numbers for various components
const int green = 10;
const int orange = 11;
const int red = 12;
const int buzz = 13;
void setup()
{
  Serial.begin(9600);
  lcd.begin(16, 2);
  // Set pin modes for various components
  pinMode(in, INPUT);
  pinMode(out, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(orange, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(buzz, OUTPUT);
  // Display a startup message on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Flood Monitoring");
  lcd.setCursor(0, 1);
  lcd.print("Alert!!");
  // Wait for 5 seconds and then clear the LCD
  delay(5000);
  lcd.clear();
}
void loop()
{
  // Read distance from the ultrasonic sensor (HC-SR04)
  long dur;
  long dist;
  long per;
  digitalWrite(out, LOW);
  delayMicroseconds(2);
  digitalWrite(out, HIGH);
  delayMicroseconds(10);
  digitalWrite(out, LOW);
  dur = pulseIn(in, HIGH);
  dist = (dur * 0.034) / 2;
  // Map the distance value to a percentage value
  per = map(dist, 10.5, 2, 0, 100);
  // Ensure that the percentage value is within bounds
  if (per < 0)
  {
    per = 0;
  }
  if (per > 100)
  {
    per = 100;
  }
  // Print water level data to serial
  Serial.print("Water Level:");
  Serial.println(String(per));
  lcd.setCursor(0, 0);
  lcd.print("Water Level:");
  lcd.print(String(per));
  lcd.print("%  ");
  // Check water level and set alert levels
  if (dist <= 3)
  {
    lcd.setCursor(0, 1);
    lcd.print("Red Alert!   ");
    digitalWrite(red, HIGH);
    digitalWrite(green, LOW);
    digitalWrite(orange, LOW);
    digitalWrite(buzz, HIGH);
    delay(2000);
    digitalWrite(buzz, LOW);
    delay(2000);
    digitalWrite(buzz, HIGH);
    delay(2000);
    digitalWrite(buzz, LOW);
    delay(2000);
  }
  else if (dist <= 10)
  {
    lcd.setCursor(0, 1);
    lcd.print("Orange Alert!  ");
    digitalWrite(orange, HIGH);
    digitalWrite(red, LOW);
    digitalWrite(green, LOW);
    digitalWrite(buzz, HIGH);
    delay(3000);
    digitalWrite(buzz, LOW);
    delay(3000);
  }
  else
  {
    lcd.setCursor(0, 1);
    lcd.print("Green Alert!  ");
    digitalWrite(green, HIGH);
    digitalWrite(orange, LOW);
    digitalWrite(red, LOW);
    digitalWrite(buzz, LOW);
  }
}