#define ECHO_PIN 2
#define TRIG_PIN 15
#define ledred 5
#define ledoranye 18
#define ledgreen 25
#define ledblue 12
#define buzz 14
#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C lcd (0x27,20,4);

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(ledred, OUTPUT);
  pinMode(ledoranye, OUTPUT);
  pinMode(ledgreen, OUTPUT);
  pinMode(buzz, OUTPUT);
 
}


void loop() {
  lcd.setBacklight(HIGH);
  delay(100);
  lcd.setBacklight(LOW); 
  delay(100); 
  lcd.setBacklight(HIGH); 
  delay(100); 
  lcd.setBacklight(LOW); 
  delay(100); 
  lcd.setBacklight(HIGH); 
  delay(100);

  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;
  
 Serial.print("jarak: ");
 Serial.println(distance);

 delay(1000);

if (distance>301){
  Serial.print("Zona Aman....");
  digitalWrite(ledgreen, HIGH);
  delay(600);
  digitalWrite(ledgreen, LOW);
  delay(600);
  digitalWrite(ledgreen, HIGH);
  delay(600);
  digitalWrite(ledgreen, LOW);
  digitalWrite(ledoranye, LOW);
  digitalWrite(ledred, LOW);
  digitalWrite(ledblue, LOW);

  lcd.init(); 
  lcd.backlight(); 
  lcd.setCursor(0,0); 
  lcd.print("Zona Aman");
  lcd.init(); 
  lcd.backlight(); 
  lcd.setCursor(0,1);
  lcd.print ("jarak: ");
  lcd.println(distance); 
    
}
else if (distance>300 && distance <=201){
  Serial.print("Zona Bahaya!");
  digitalWrite(ledgreen, LOW);
  digitalWrite(ledred, LOW);
  digitalWrite(ledblue, LOW);
  digitalWrite(ledoranye, HIGH);
  delay(600);
  digitalWrite(ledoranye, LOW);
  delay(600);
  digitalWrite(ledoranye, HIGH);
  delay(600);
  digitalWrite(ledoranye, LOW);
  lcd.init(); 
  lcd.backlight(); 
  lcd.setCursor(0,0); 
  lcd.print("Hati hati woi");
  lcd.init(); 
  lcd.backlight(); 
  lcd.setCursor(0,1);
  lcd.print ("jarak: ");
  lcd.println(distance); 
}
else if (distance>200 && distance <=101){
  Serial.print("Zona Ba");
  digitalWrite(ledgreen, LOW);
  digitalWrite(ledred, LOW);
  digitalWrite(ledblue, LOW);
  digitalWrite(ledblue, HIGH);
  delay(600);
  digitalWrite(ledblue, LOW);
  delay(600);
  digitalWrite(ledblue, HIGH);
  delay(600);
  digitalWrite(ledblue, LOW);
  lcd.init(); 
  lcd.backlight(); 
  lcd.setCursor(0,0); 
  lcd.print("BAHAYA!!");
  lcd.init(); 
  lcd.backlight(); 
  lcd.setCursor(0,1);
  lcd.print ("jarak: ");
  lcd.println(distance); 
}
else if (distance <=100){
  Serial.print("Zona Danger, Alarm Bunyi!!!");
  digitalWrite(ledoranye, LOW);
  digitalWrite(ledgreen, LOW);
  digitalWrite(ledred, HIGH);
  digitalWrite(ledblue, LOW);
  delay(600);
  digitalWrite(ledred, HIGH);
  delay(600);
  digitalWrite(ledred, LOW);
  delay(600);
  digitalWrite(ledred, HIGH);
  tone(buzz, 1000);
  lcd.init(); 
  lcd.backlight(); 
  lcd.setCursor(0,0); 
  lcd.print("ZONA BAHAYA !!");
  lcd.init(); 
  lcd.backlight(); 
  lcd.setCursor(0,1);
  lcd.print ("jarak: ");
  lcd.println(distance); 

}
}