void setup() 
{
  Serial.begin(115200);
  pinMode(5,OUTPUT);
  pinMode(5,OUTPUT);
}

void loop() 
{
 int n = Serial.available();
 if (n > 0)
 {
   byte c   = Serial.read();
   if (c == '0')
   {
    digitalWrite(5,0);
    digitalWrite(6,0);
   }
   if (c == '1')
   {
    digitalWrite(5,1);
    digitalWrite(6,0);
   }
   if (c == '2')
   {
    digitalWrite(5,0);
    digitalWrite(6,1);
   } 
   if (c == '3')
   {
    analogWrite(5,200);
    digitalWrite(6,0);
   }
   if (c == '4')
   {
    analogWrite(5,300);
    digitalWrite(6,0);
   }
 }
 delay(100);
}