RGBF - LED Diffuser with Fade

/*
 * Serial RGB LED -- Modified by Shaun Giudici
 * ---------------
 * Serial commands control the brightness of R,G,B LEDs
*
 * Script will count the occurrances of R's G's and B's
 * Each occurance will count for 20% brightness
 *
 * Script will also count nmuber of F's
 * More F's == More Speed
 *
 * For example the command "rrrgbfff" will set red led to 60%, green led to 20% and blue led to 20% at medium speed
 *
 */

char serInString[100];  // array that will hold the different bytes of the string. 100=100characters;
                        // -> you must state how long the array will be else it won't work properly

char colorCode;
int colorVal;

int redPin   =11;   // Red LED,   connected to digital pin 9
int greenPin = 10;  // Green LED, connected to digital pin 10
int bluePin  = 9;  // Blue LED,  connected to digital pin 11

int r =0;
int g =0;
int b =0;
int f =0;  // Start with fading off
int fadeVals[3];
int fadeSpeed = 10;      // default fade speed
int fadeDirection = 0;   // 0 means fade out

void setup() {
  pinMode(redPin,   OUTPUT);   // sets the pins as output
  pinMode(greenPin, OUTPUT);   
  pinMode(bluePin,  OUTPUT);
  Serial.begin(9600);
  analogWrite(redPin,   127);   // set them all to mid brightness
  analogWrite(greenPin, 127);   // set them all to mid brightness
  analogWrite(bluePin,  127);   // set them all to mid brightness
  Serial.println("Each R, G, or B gets you 20% LED brightness");  
  Serial.println("Enter F's to change fade speed");  
}

void loop () {
  // clear the string
  memset(serInString, 0, 100);
  //read the serial port and create a string out of what you read
  readSerialString(serInString);
 
  if (serInString[0] != 0) {
    r=0;
    g=0;
    b=0;
    f=0;
    for (int i=0; i<100; i++) {
       if(serInString[i] == 'r' || serInString[i] == 'R') {
          r++;
       }
       else if(serInString[i] == 'g' || serInString[i] == 'G') {
          g++;
       }
       else if(serInString[i] == 'b' || serInString[i] == 'B') {
          b++;
       }
       else if(serInString[i] == 'f' || serInString[i] == 'F') {
          f++;
       }
    }
    r=255*r/5;
    g=255*g/5;
    b=255*b/5;
    if(r>255){r=255;}
    if(g>255){g=255;}
    if(b>255){b=255;}
    Serial.print("setting RGB to (");
    Serial.print(r);
    Serial.print(", ");
    Serial.print(g);
    Serial.print(", ");
    Serial.print(b);
    Serial.print(")");
    Serial.println();
    analogWrite(redPin, r);
    analogWrite(greenPin, g);
    analogWrite(bluePin, b);
 
    // set fading
    fadeSpeed = 200/f;
    fadeVals[0] = r;
    fadeVals[1] = g;
    fadeVals[2] = b;
  }
 
  if (f>0) {
    Serial.print(fadeVals[0]);
    Serial.print(" ");
    Serial.print(fadeVals[1]);
    Serial.print(" ");
    Serial.print(fadeVals[2]);
    Serial.println();
    if (!fadeDirection) {
      if (fadeVals[0] > 0) {fadeVals[0]--; }
      if (fadeVals[1] > 0) {fadeVals[1]--; }
      if (fadeVals[2] > 0) {fadeVals[2]--; }
      if (fadeVals[0] == 0 && fadeVals[1] == 0 && fadeVals[2] == 0) { fadeDirection = 1; }
    } else {
      if (fadeVals[0] < r) {fadeVals[0]++; }
      if (fadeVals[1] < g) {fadeVals[1]++; }
      if (fadeVals[2] < b) {fadeVals[2]++; }
      if (fadeVals[0] == r && fadeVals[1] == g && fadeVals[2] == b) { fadeDirection = 0; }
    }
    analogWrite(redPin,   fadeVals[0]);   // Write current values to LED pins
    analogWrite(greenPin, fadeVals[1]);
    analogWrite(bluePin,  fadeVals[2]);  
    delay(fadeSpeed);
  } else {
    delay(100);  // wait a bit, for serial data
  }
}

//read a string from the serial and store it in an array
//you must supply the array variable
void readSerialString (char *strArray) {
  int i = 0;
  if(!Serial.available()) {
    return;
  }
  while (Serial.available()) {
    strArray[i] = Serial.read();
    i++;
  }
}