#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16,2);
#define ECHO_PIN 2
#define TRIG_PIN 3
#define ledMerah 11
#define ledKuning 12
#define ledHijau 13

void setup(){
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(ledMerah, OUTPUT);
  pinMode(ledKuning, OUTPUT);
  pinMode(ledHijau, OUTPUT);
}

float readDistanceCM(){
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration=pulseIn(ECHO_PIN, HIGH);
  return duration *0.034/2;
}

void loop(){
  float distance=readDistanceCM();
  Serial.print("Measured Distance: ");
  Serial.print(readDistanceCM());
  Serial.print(" cm");

  if(distance>=100){
    digitalWrite(ledHijau, HIGH);
    digitalWrite(ledMerah, LOW);
    digitalWrite(ledKuning, LOW);
    lcd.setCursor(0,0);
    lcd.print("Jarak air:");
    lcd.print(readDistanceCM());
    lcd.print("                       ");
    lcd.setCursor(0,1);
    lcd.print("           AMAN");
    lcd.print("                     ");
  }
  else if((distance>=50) && (distance<100)){
    digitalWrite(ledKuning, HIGH);
    digitalWrite(ledMerah, LOW);
    digitalWrite(ledHijau, LOW);
    lcd.setCursor(0,0);
    lcd.print(readDistanceCM());
    lcd.print("                       ");
    lcd.setCursor(3,1);
    lcd.print("Hati-hati Banjir");
    lcd.print("                     ");
  }
  else if(distance<50){
    digitalWrite(ledMerah, HIGH);
    digitalWrite(ledKuning, LOW);
    digitalWrite(ledHijau, LOW);
    lcd.setCursor(0,0);
    lcd.print(readDistanceCM());
    lcd.print("                       ");
    lcd.setCursor(1,1);
    lcd.print("Bahaya Banjir");
    lcd.print("                       ");  
    delay(1000);
    lcd.setCursor(1,1);
    lcd.print("Segera Evakuasi");
    delay(1000);
    lcd.print("                       ");
  }
}