int ledpin = 3;
int state = 0;

void setup() {
  Serial.begin(9600);
  pinMode(ledpin, OUTPUT);
  Serial.println("Vpisi znak");
}

void loop() {
  if (Serial.available() >= 6) { 
    char input[6];
    Serial.readBytes(input, 6); //
    if (strcmp(input, "777111") == 0) {
      Serial.println("LED prižgan");
      digitalWrite(ledpin, HIGH);
      state = 0; 
      
    }
    else if (strcmp(input, "777222") == 0) {
      Serial.println("LED ugasnjen");
      digitalWrite(ledpin, LOW);
    }
    else if (strcmp(input, "777333") == 0) {
      if (state == 0) {
        Serial.println("LED utripa");
        state = 1;
      }
    }
    else if (strcmp(input, "777444") == 0) {
      Serial.println("LED utripne 10-krat");
      for (int i = 0; i < 10; i++) {
        utripanje();
      }
    }
    else {
      Serial.println("Napaka, ponovni vnos");
    }
  }

  if (state == 1) {
    utripanje();
  }
}

void utripanje() {
  digitalWrite(ledpin, HIGH);
  delay(200);
  digitalWrite(ledpin, LOW);
  delay(200);
}