#include <Wire.h>
#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C lcd(0x27, 16, 1);
int trig= 11;
int echo= 12;
int speaker = 10; 
long durasi, 
jarak;
void setup() {
pinMode(trig, OUTPUT); 
pinMode(echo, INPUT); 
pinMode(speaker,OUTPUT);
lcd.begin (16, 2);
lcd.setCursor(1, 0); 
lcd.print("SINAR COMPUTER");
lcd.setCursor(3,1); 
lcd.print("Ultrasonic");
delay(3000); 
Serial.begin(9600);
  // put your setup code here, to run once:
}

void loop() {
lcd.clear(); 
lcd.setCursor(1,0);
lcd.print("Jarak:"); 
lcd.print("jarak"); 
lcd.print("cm"); 
lcd.setCursor(2,1);
digitalWrite(trig, LOW); 
delayMicroseconds(8);
digitalWrite(trig, HIGH); 
delayMicroseconds(8); 
digitalWrite(trig,LOW);
delayMicroseconds(8);
durasi= pulseIn(echo, 
HIGH); jarak= (durasi/2) / 29.1;
 Serial.println(jarak); 
delay(5);
if ( jarak < 100 ) {
lcd.print(" Awas nabrak "); 
digitalWrite(speaker,HIGH);
delay(500);
} else if (jarak > 20 ){ 
lcd.print(" jarak aman "); 
digitalWrite(speaker, LOW);
tone(speaker,600,300);
delay(500);

}
delay(1000);
// lcd.clear();
}

  
  // put your main code here, to run repeat