void setup() {
  // put your setup code here, to run once:
  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(7,OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available()){
    switch(Serial.read()){
      case '1':
        digitalWrite(7,HIGH);
      break;
      case '2':
        digitalWrite(7,LOW);
      break;
      case '3':
        digitalWrite(5,HIGH);
      break;
      case '4':
        digitalWrite(5,LOW);
      break;
      case '5':
        digitalWrite(6,HIGH);
      break;
      case '6':
        digitalWrite(6,LOW);
      break;
    }
  }
}