Arduino code to control the intensity of an LED

serialLEDControl.ino

// control intensity of LED using serial communication

int incomingByte = 0;	// for incoming serial data
int outVal = 0; // for signal out
int pwmPin = 6; // white wire (pin 5 and 6 have pwm frequency ~1000 Hz, faster than pin 9)
int statusLED = 13;
int delaymsec = 100;

void setup() {
  Serial.begin(9600);	// opens serial port, sets data rate to 9600 bps
  // initialize pwm and dir pins as outputs.
  pinMode(pwmPin, OUTPUT);
  pinMode(statusLED, OUTPUT); // status LED
}

void loop() {
  // check for incoming serial data:
  if (Serial.available() > 0) {
    // read the incoming byte:
    incomingByte = int(Serial.read()) - 48;
  }
  if ((incomingByte >= 0) &&  (incomingByte <= 5)){
    if (incomingByte > 0) {digitalWrite(statusLED,HIGH);}
    else {digitalWrite(statusLED,LOW);}
    outVal = map(incomingByte, 0, 5, 0, 255);
    analogWrite(pwmPin, outVal);
    delay(delaymsec);
  }
}