void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
Serial.println();
pinMode(2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
if(Serial.available()>0){
int data=Serial.read();
if(data!='\n'){
Serial.print("User Input:");
Serial.println(data);
if(data=='5'){
digitalWrite(2, HIGH);
}
}
if(data=='8'){
digitalWrite(2, LOW);
}
}
}