#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd (0x27, 16, 2);

float mengukur_jarak() {
digitalWrite(10, HIGH);
delayMicroseconds(10);
digitalWrite(10, LOW);

long duration = pulseIn(9, HIGH);
float distance = duration/58;

return distance;
}

void setup() {
 pinMode(13, OUTPUT);
 pinMode(12, OUTPUT);
 pinMode(11, OUTPUT);
 pinMode(10, OUTPUT);
 pinMode(9,INPUT);
 pinMode(8, OUTPUT);

lcd.init();
lcd.backlight();
lcd.setCursor(0,0);

}

void loop() {
 lcd.clear();
  digitalWrite(13, LOW);
  digitalWrite(12, LOW);
  digitalWrite(11, LOW);

  float jarak_terukur = mengukur_jarak();
  if (jarak_terukur < 50 && jarak_terukur >=2){
    lcd.setCursor(0,0);
    lcd.print("Jarak: ");
    lcd.print(jarak_terukur);
    lcd.print(" cm");
    delay(2000);
    digitalWrite(13, HIGH);
    digitalWrite(8, HIGH);
    delay(500);
    digitalWrite(13, LOW);
    digitalWrite(8, LOW);
  }
  else if (jarak_terukur < 150 && jarak_terukur >=51){
    lcd.setCursor(0,0);
    lcd.print("Jarak: ");
    lcd.print(jarak_terukur);
    lcd.print(" cm");
    delay(2000);
    digitalWrite(11, HIGH);
    delay(500);
    digitalWrite(11, LOW);
  }

  else if (jarak_terukur >=150){
    lcd.setCursor(0,0);
    lcd.print("Jarak: ");
    lcd.print(jarak_terukur);
    lcd.print(" cm");
    delay(2000);
    digitalWrite(12, HIGH);
    delay(500);
    digitalWrite(12, LOW);
  }

}