#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

#define trigpin 4
#define echopin 2

int ledlow = 5;
int ledmiddle = 6;
int ledhigh = 7;
int buzzer = 8;
int relaybahaya = 9;

void setup ()
{
  Serial.begin (9600)
  lcd.begin(16, 2);
  pinMode(rigpin, OUTPUT);
  pinMode(echopin, OUTPUT);
    pinMode(ledlow, OUTPUT);
    pinMode(ledmiddle, OUTPUT);
    pinMode(ledhigh, OUTPUT);
    pinMode(buzzer, OUTPUT);
    pinMode(relaybahaya, OUTPUT);

  digitalWrite(ledlow, LOW) 
  digitalWrite(ledmiddle, LOW) 
  digitalWrite(ledhigh, LOW)
  digitalWrite(buzzer, LOW)
  digitalWrite(relaybahaya, LOW)

  delay(1000);
}

void loop()
{
  int duration, distance;
  digitalWrite(trigpin, HIGH);
delayMicroseconds(1000);
digitalWrite(trigpin, LOW);
duration = pulseIn(echopin,HIGH);
dictance = (duration / 2) /29.1;
Serial.println("cm");
Serial.println(distance);

lcd.setCursor(0,0);
  lcd.print("jara = ");
  lcd.print(distance);
  lcd.print("cm");

  if ( (distance >0) && (distance <= 10))
}