byte data;
const int ledPin = 16; 

void setup() { 
  Serial.begin(9600); //initialize serial COM at 9600 baudrate
  pinMode(ledPin, OUTPUT); //make the LED pin (13) as output
  digitalWrite (ledPin, LOW);
}
 
void loop() {
while (Serial.available()){
  data = Serial.read();
}

if (data == '1'){
digitalWrite (ledPin, HIGH);
}
else if (data == '0'){
digitalWrite (ledPin, LOW);
}
}