Arduino file humming board server

#define TEMP_INTERVAL 1000 //every half a second update the temperature

#define TEMP1_PIN A0//temperature pin
#define TEMP2_PIN A1//temperature pin

#define SWITCH_PIN 7
#define LED_PIN 13
const int pins[3] = {9,10,11};//output pins
const char letters[3] = {'R','G','B'};//letters
int sensor = TEMP1_PIN;

unsigned long timeStamp = 0;
int getTemp();
void setup() {
  //outputs led
  //analogReference(INTERNAL);//1.1v reference
  for(int i = 0; i < 3; i++)
  {
    pinMode(pins[i],OUTPUT);
  }
  pinMode(LED_PIN,OUTPUT);
  //inputs:
  //pinMode(SWITCH_PIN,INPUT_PULLUP);
  pinMode(TEMP1_PIN,INPUT);
  pinMode(TEMP2_PIN,INPUT);
  Serial.begin(9600);
  timeStamp = millis();
}

void loop() {
  // put your main code here, to run repeatedly:
  static boolean state = false;

  if(Serial.available() > 0)
  {
    static char setting;
    static byte data;
    int flag = false;
    setting = Serial.read();//first color is sent, then pwm value as a number

    data = Serial.parseInt();
    data = data & 255;//just ignore all the bits of the bigger number
    //search the right pins for the color
    //if found, raise the flag and send back ack.
    //other wise, send negative ack, probably color mistake
    for(int i = 0; i < 3 && !flag; i++)
    {
      if(setting == letters[i])
      {
        analogWrite(pins[i],data);
        flag = true;
      }
    }
    if(!flag)//not rgb color set
    {
      if(setting == 't')
      {//change the current sensor
        switch(data)
        {
          case 1:
            sensor = TEMP1_PIN;
            digitalWrite(LED_PIN,LOW);
            break;
          case 2:
            digitalWrite(LED_PIN,HIGH);
            sensor = TEMP2_PIN;
            break;
        }
        //Serial.println(sensor);
      }
    }
    delay(20);

  }
  if(millis() - timeStamp >= TEMP_INTERVAL)
  {
    timeStamp = millis();
    //Serial.print("T");
    Serial.print(getTemp(sensor));
  }
}


int getTemp(int tempSensor)
{
  int reading = analogRead(tempSensor);
  //return reading / 9.31;
  return (5 * reading * 100)/1024;
}