int inByte;
void setup() {
  
  Serial.begin(9600);
  pinMode(6, OUTPUT);
  Serial.println("Ready");
}
void loop() {
  if(Serial.available()>0){
    inByte=Serial.read();
    if(inByte=='o'){
      digitalWrite(6, HIGH);
      Serial.println("LED is ON");    
    }
    if(inByte=='i'){
      digitalWrite(6, LOW);
      Serial.println("LED is OFF");    
    }
  }
}