#include <Wire.h>
#include <LiquidCrystal_I2C.h>

int lcdColumns = 20;
int lcdRows = 4;

LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);

void setup() {
  Wire.begin();
  Serial.begin(115200);
  Serial.println("\nI2C Scanner");
  lcd.init();
  lcd.backlight();
}
 
void loop() {
  byte error, address;
  int nDevices;

  //untuk menampilkan text pada lcd
  lcd.setCursor(0, 0);
  lcd.print("Selamat Datang");
  lcd.setCursor(0, 1);
  lcd.print("Kelas IoT & FPGA"); 
  lcd.setCursor(0, 2);
  lcd.print("Batch 4 - 2023");
  delay(1000);
  //menampilkan apakah alamat lcd ditemukan atau tidak
  Serial.println("Scanning...");
  nDevices = 0;
  for(address = 1; address < 127; address++ ) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0) {
      Serial.print("I2C device found at address 0x");
      if (address<16) {
        Serial.print("0");
      }
      Serial.println(address,HEX);
      nDevices++;
    }
    else if (error==4) {
      Serial.print("Unknow error at address 0x");
      if (address<16) {
        Serial.print("0");
      }
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0) {
    Serial.println("No I2C devices found\n");
  }
  else {
    Serial.println("done\n");
  }
  delay(5000);          
}