#include <LiquidCrystal_I2C.h>  

const int trigPin   = 13; 
const int echoPin   = 12; 
const int ledPin1   = 2; 
const int ledPin2   = 3;
const int ledPin3   = 4;
const int slidePin  = 5;

LiquidCrystal_I2C lcd (0x27, 16, 2);



void setup() {
  // put your setup code here, to run once:

  void kondisi_laser();

pinMode(trigPin , OUTPUT);      
  pinMode(echoPin , INPUT);         
  pinMode(ledPin1  , OUTPUT); 
  pinMode(ledPin2  , OUTPUT); 
  pinMode(ledPin3  , OUTPUT);        
  pinMode(slidePin, INPUT_PULLUP);

  lcd.init();                 
  lcd.backlight();         
  lcd.setCursor(0,0);        
  lcd.print("METERAN LASER"); 

  digitalWrite(trigPin, LOW);
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, LOW);
  digitalWrite(ledPin3, LOW);
  delay(3000);


}

void loop() {

  int membacaPinSlide = digitalRead(slidePin); 
 
  if (membacaPinSlide != 0){
    lcd.setCursor(0,1); 
    lcd.clear();
    lcd.print("LED Merah");     
    digitalWrite(ledPin1, HIGH);  
    digitalWrite(ledPin2, LOW); 
    digitalWrite(ledPin3, LOW);
    delay(1000);
    lcd.clear();
 lcd.print("LED Kuning");
 digitalWrite(ledPin1, LOW);  
    digitalWrite(ledPin2, HIGH); 
    digitalWrite(ledPin3, LOW);
    delay(1000);
    lcd.clear();
    lcd.print("LED Hijau");
 digitalWrite(ledPin1, LOW);  
    digitalWrite(ledPin2, LOW); 
    digitalWrite(ledPin3, HIGH);
    delay(1000);
    digitalWrite(ledPin3, LOW);
    
  }
  else{
digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);


  long durasi = pulseIn(echoPin, HIGH);

  float distance = durasi/58.0;

 lcd.clear ();
  lcd.setCursor(0,0);
  lcd.print("Jarak : ");
  lcd.print(distance);
  lcd.print("cm");
  delay(1000);


  }
}