char input;

void setup() {
  // put your setup code here, to run once:
  pinMode(12, OUTPUT);
  Serial.begin(9600);
  Serial.println("LED Control via Serial Monitor");
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available()){
    input=Serial.read();
  }
  if (input=='1'){
    digitalWrite(12,HIGH);
  }
  if (input=='0'){
    digitalWrite(12,LOW);
  }
}