char data=0;
int led=13;
void setup() {
  Serial.begin(9600);
  pinMode(13, OUTPUT);
  // put your setup code here, to run once:

}

void loop() {
  if(Serial.available()>0);{
    data=Serial.read();
    Serial.print(data);
    Serial.print("\n");
  if(data=='1')
    digitalWrite(led, HIGH);
    
  else if(data=='0')
    digitalWrite(led, LOW);
}
}
  // put your main code here, to run repeatedly: