//int incomingByte = 0;
int incomingByte = 121;

    void setup() {
            Serial.begin(300);     // opens serial port, sets data rate to 9600 bps
            pinMode(11, OUTPUT);
            pinMode(12, OUTPUT);
            pinMode(13, OUTPUT); // set up our leds
    }

    void loop() {

            // send data only when you receive data:
            if (Serial.available() > 0) {
                    // read the incoming byte:
                    incomingByte = Serial.read();

                    if (incomingByte < 0x80)
                    {
                        // less than 0x80
                        digitalWrite(13, HIGH);
                        digitalWrite(12, LOW);
                        digitalWrite(11, LOW);
                    }
                    else
                    {
                        // if equal to or more than 0x80
                        digitalWrite(12, HIGH);
                        digitalWrite(13, LOW);
                        digitalWrite(11, LOW);
                    }
            } else {
              // no data, panic
              digitalWrite(11, HIGH);
              digitalWrite(12, LOW);
              digitalWrite(13, LOW);
            }
    }