Lab 2 - Peter Nguyen - Fading LEDs - Color Picker

Description: I played around with the fader code, and then modified the serial RGB code to increase brightness by 25 every time someone enters the r, g, or b keys. When it gets to 255, the values go back to 0. By entering z, you can zero all the values, blanking the origami balloon box.
I did the optional section as well, adding RGB values for entering y (yellow), o (orange), and p (purple).  
I could not use r, g, or b again-- so I coded 1 = 100% red, 2 = 100% green, and 3 = 100% blue. r, g, and b are used to increase brightness by 25 (leading up to 255). 
 
Components:
3 LEDs - Red, Green, Blue
3 220 Ohm Resistors
1 Arduino Uno
 
Code:
/*
 * Serial RGB LED
 * ---------------
 * Serial commands control the brightness of R,G,B LEDs .. AND MORE!

 * Created 18 October 2006
 * copyleft 2006 Tod E. Kurt <tod@todbot.com
 * http://todbot.com/

 * Modified 18 September 2013
 * Assignment 2 - Peter Nguyen

 */

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 colorValR = 255;
int colorValG = 255;
int colorValB = 255;

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

void setup() {
  pinMode(redPin,   OUTPUT);   // sets the pins as output
  pinMode(greenPin, OUTPUT);   
  pinMode(bluePin,  OUTPUT);
  Serial.begin(9600);
  analogWrite(redPin,   colorValR);   // set them all to highest brightness
  analogWrite(greenPin, colorValG);   // set them all to highest brightness
  analogWrite(bluePin,  colorValB);   // set them all to highest brightness
  Serial.println("enter color command (e.g. r, g, b, 1, 2, 3, o, y, p) :");  
}

void loop () {
  // clear the string
  memset(serInString, 0, 100);
  //read the serial port and create a string out of what you read
  readSerialString(serInString);
  colorCode = serInString[0];
 
   if( colorCode == 'r' || colorCode == 'g' || colorCode == 'b' || colorCode == 'o' || colorCode == 'y' || colorCode == 'p' || colorCode == 'z' || colorCode == '1' || colorCode == '2' || colorCode == '3' ) {
    
    //colorVal = atoi(serInString+1);
    //colorVal = colorVal + 25.5;
    
    //if (colorVal > 255) {
    //  colorVal = -25.5;
    //}

    if (colorValR >= 255) {
      colorValR = 0;
    }
    if (colorValG >= 255) {
      colorValG = 0;
    }
    if (colorValB >= 255) {
      colorValB = 0;
    }

    Serial.println();
    
    serInString[0] = 0;        // indicates we've used this string
 
    if(colorCode == 'r') {
      Serial.print("setting RED to ");
      Serial.print(colorValR);
      analogWrite(redPin, colorValR);
      colorValR = colorValR + 25;
    }
    else if(colorCode == 'g') {
      Serial.print("setting GREEN to ");
      Serial.print(colorValG);
      analogWrite(greenPin, colorValG);
      colorValG = colorValG + 25;
    }
    else if(colorCode == 'b') {
      Serial.print("setting BLUE to ");
      Serial.print(colorValB);
      analogWrite(bluePin, colorValB);
      colorValB = colorValB + 25;
    }

    else if(colorCode == 'o') {
      analogWrite(redPin,   255);   
      analogWrite(greenPin, 127);   
      analogWrite(bluePin,  0);   
      Serial.print("ORANGE");
    }
    else if(colorCode == 'y') {
      analogWrite(redPin,   255);   
      analogWrite(greenPin, 255);   
      analogWrite(bluePin,  0);   
      Serial.print("YELLOW");
    }
    else if(colorCode == 'p') {
      analogWrite(redPin,   143);   
      analogWrite(greenPin, 0);   
      analogWrite(bluePin,  255);   
      Serial.print("PURPLE");
   }
    else if(colorCode == 'z') {
      analogWrite(redPin,   0);   
      analogWrite(greenPin, 0);   
      analogWrite(bluePin,  0);   
      Serial.print("Clear All");
    }
    else if(colorCode == '1') {
      analogWrite(redPin,   255);   
      analogWrite(greenPin, 0);   
      analogWrite(bluePin,  0);   
      Serial.print("RED");
    }
    else if(colorCode == '2') {
      analogWrite(redPin,   0);   
      analogWrite(greenPin, 255);   
      analogWrite(bluePin,  0);   
      Serial.print("GREEN");
    }
    else if(colorCode == '3') {
      analogWrite(redPin,   0);   
      analogWrite(greenPin, 0);   
      analogWrite(bluePin,  255);   
      Serial.print("BLUE");
    }

  }
  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++;
  }
}