#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27, 16, 2);
const int trigPin = 6;
const int echoPin = 7;
int buzzer=8;
long duration;
int jarakCm, jarakInch;
void setup() {
lcd.begin(12,2);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
}
void loop() {
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
jarakCm= duration*0.034/2;
jarakInch = duration*0.0133/2;
lcd.setCursor(0,0);
lcd.print("Jarak: ");
lcd.print(jarakCm);
lcd.print(" cm ");
delay(10);
lcd.setCursor(0,1);
lcd.print("Jarak: ");
lcd.print(jarakInch);
lcd.print(" inch ");
delay(10);
if(jarakCm <=5) {
tone(buzzer,1030);
delay(400);
noTone(8);
delay(100);
}
}