const int trigPin1 = 13;
const int echoPin1 = 12;
#define redled 18
#define yellowled 19
#define greenled 5
#define BUZZER 2
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27, 16, 2);
unsigned long startMillis;
unsigned long currentMillis;
const unsigned long period = 10000;
long duration1;
int distance1;
void setup()
{
  pinMode(trigPin1, OUTPUT);
  pinMode(echoPin1, INPUT);
  pinMode(redled, OUTPUT);
  pinMode(greenled, OUTPUT);
  pinMode(yellowled, OUTPUT);
  digitalWrite(redled, LOW);
  digitalWrite(greenled, LOW);
  digitalWrite(yellowled, LOW); 
  lcd.init();
  Serial.begin(115200);
  lcd.backlight();
}
void loop()
{
  lcd.setCursor(2, 0) ;
  lcd.print("SMART  FLOOD");
  lcd.setCursor(0, 1) ;
  lcd.print("DETECTION SYSTEM");
  delay(5000);
  lcd.clear();
  delay(300);
  digitalWrite(trigPin1, HIGH);
  digitalWrite(trigPin1, LOW);
  duration1 = pulseIn(echoPin1, HIGH);
  distance1 = duration1 * 0.034 / 2;
  Serial.println(distance1);
  if (distance1 <= 50)
  {
    digitalWrite(18, HIGH);
    digitalWrite(19, LOW);
    digitalWrite(5, LOW);
    delay(200);
    tone(BUZZER, 3000);
    lcd.clear();
    lcd.setCursor(4, 0) ;
    lcd.print("HIGH RISK");
    delay(3000);
    noTone(BUZZER);
    digitalWrite(18, LOW);
    digitalWrite(19, LOW);
    digitalWrite(5, LOW);
    delay(1000);
    
  }
  if (distance1 >= 51 && distance1 <= 80 )
  {
    digitalWrite(19, HIGH);
    digitalWrite(18, LOW);
    digitalWrite(5, LOW);
    tone(BUZZER, 1200);
    lcd.setCursor(2, 0) ;
    lcd.print("MEDIUM RISK");
    delay(3000);
    lcd.clear();
    noTone(BUZZER);
    digitalWrite(19, LOW);
    digitalWrite(18, LOW);
    digitalWrite(5, LOW);
    delay(1000);
    
   
    
  }
  else
  {
    digitalWrite(5, HIGH);
     digitalWrite(18, LOW);
    digitalWrite(19, LOW);
    noTone(BUZZER);
    lcd.clear();
    lcd.setCursor(4, 0) ;
    lcd.print("NO  RISK");
    delay(5000);
    lcd.clear();
    delay(1000);
  }
  
}