#define PASSWORD "1234"
#define USERNAME "ridwan"


void setup() 
{
  Serial.begin(9600);
  String user, pass;
 
  delay(1000);
  Serial.println("Silahkan Masukan Username dan Password");
  Serial.print("Username:");
  while (Serial.available());
  user Serial.readString();
  Serial.println(user);

  Serial.print("Password:");
  while (Serial.available());
  pass = Serial.readString();
  Serial.println(pass);

  if (user == USERNAME)
  {
    if (pass == PASSWORD)
    {
void loop() 
  String s;
  if (Serial.available())
  {
    s = Serial.readString();
    if (s == "220806\n") {
      Serial.println("Password benar ");
      digitalWrite(4, HIGH);
      }
      else 
      {
        Serial.println("Password salah ");
        digitalWrite(4, LOW);
    }
  }
}