t#include <LiquidCrystal_I2C.h> //untuk memanggil library lcd i2c
LiquidCrystal_I2C lcd(0x27, 16, 2); //deklarasikan bahwa kita menggunakan lcd jenis 16x2
void setup()
{
lcd.init(); //perintah untuk mengaktifkan lcd i2c
lcd.backlight(); //untuk menyalakan lampu pada lcd i2c
lcd.setCursor(0, 0); //untuk meletakan karakter di kolom pertama baris pertama
lcd.print("Selamat Datang"); //untuk menampilkan tulisan di lcd i2c
lcd.setCursor(0,1); //untuk meletakan karakter di kolom pertama baris kedua
lcd.print("Kelas XI SIJA 1"); //untuk menampilkan tulisan di lcd i2c
}
void loop()
const int trigPin = 5;
const int echoPin = 18;
//define sound speed in cm/uS
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701
long duration;
float distanceCm;
float distanceInch;
void setup() {
 Serial.begin(115200); // Starts the serial communication
 pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
 pinMode(echoPin, INPUT); // Sets the echoPin as an Input
}
void loop() {
 // Clears the trigPin
 digitalWrite(trigPin, LOW);
 delayMicroseconds(2);
 // Sets the trigPin on HIGH state for 10 micro seconds
 digitalWrite(trigPin, HIGH);
 delayMicroseconds(10);
 digitalWrite(trigPin, LOW);
 
 // Reads the echoPin, returns the sound wave travel time in microseconds
 duration = pulseIn(echoPin, HIGH);
 
 // Calculate the distance
 distanceCm = duration * SOUND_SPEED/2;
 
 // Convert to inches
 distanceInch = distanceCm * CM_TO_INCH;
 
 // Prints the distance in the Serial Monitor
 Serial.print("Distance (cm): ");
 Serial.println(distanceCm);
 Serial.print("Distance (inch): ");
 Serial.println(distanceInch);
 
 delay(1000);
}