int LED = 13;
int count = 0;

void setup(){
  
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
}

void loop(){
  count++;
  Serial.write(count);
  if((count % 2) == 1){ 
    digitalWrite(LED, HIGH);
  }else{
    digitalWrite(LED, LOW);
  }
  delay(1000);
}