void setup(){ Serial.begin(19200); //Set all the pins we need to output pins pinMode(2, OUTPUT); pinMode(5, OUTPUT); } void loop (){ if (Serial.available()) { char ser = Serial.read(); //read serial as a character switch (ser) { case '0': //Turn OFF PIN 2&5 digitalWrite(2, LOW); digitalWrite(5, LOW); break; case '1': //PIN2 ON digitalWrite(2, HIGH); break; case '2': //PIN2 OFF digitalWrite(2, LOW); break; case '3': //PIN5 ON digitalWrite(5, HIGH); break; case '4': //PIN5 OFF digitalWrite(5, LOW); break; case '5': //Turn ON PIN 2&5 digitalWrite(5, HIGH); digitalWrite(2, HIGH); break; } } }