const int Device1=28;
const int Device2=27;
const int Device3=26;
byte mybyte;

void setup()
{
  Serial.begin(9600);
  pinMode(Device1,OUTPUT);
  pinMode(Device2,OUTPUT);
  pinMode(Device3,OUTPUT);
  
}

void loop()
{
  if(Serial.available()>0)
  {
    mybyte=Serial.read();
    
  }

  switch(mybyte)
  {
    case 1:
    digitalWrite(Device1,HIGH);
    break;

    case 2:
    digitalWrite(Device1,LOW);
    break;

    case 3:
    digitalWrite(Device2,HIGH);
    break;

    case 4:
    digitalWrite(Device2,LOW);
    break;

    case 5:
    digitalWrite(Device3,HIGH);
    break;

    case 6:
    digitalWrite(Device3,LOW);
    break;

   
    default:
    break;
  }
}