Sparkfun Inventor's Kit Circ-14

/*     ---------------------------------------------------------

 *     |  Experimentation Kit for Arduino Example Code         |

 *     |  CIRC-14 .: Fancy Sensing :. (Soft Potentiometer)     |

 *     ---------------------------------------------------------

 *

 *    Will fade an RGB LED from Red-Green-Blue in relation to the

 *    soft pot value

 *

 */


// LED leads connected to PWM pins

const int RED_LED_PIN = 9;    //Red LED Pin

const int GREEN_LED_PIN = 10; //Green LED Pin

const int BLUE_LED_PIN = 11;  //Blue LED Pin





void setup() {

  //no need for any code here

}

   

void loop() {

  int sensorValue = analogRead(0);   //read the Soft Pot


  int redValue = constrain(map(sensorValue, 0, 512, 255, 0),0,255); //calculate the red Value (255-0 over the range 0-512)

  int greenValue = constrain(map(sensorValue, 0, 512, 0, 255),0,255)-constrain(map(sensorValue, 512, 1023, 0, 255),0,255);  //calculate the green value (0-255 over 0-512 & 255-0 over 512-1023)

  int blueValue = constrain(map(sensorValue, 512, 1023, 0, 255),0,255); //calculate the blue value 0-255 over 512-1023


  // Display the requested color

  analogWrite(RED_LED_PIN, redValue);

  analogWrite(GREEN_LED_PIN, greenValue);

  analogWrite(BLUE_LED_PIN, blueValue);

} "http://ardx.org/HSB
To convert from RGB to HSB all that is required is some slightly complicated math. Visit http://ardx.org/CODE14MB based on www.kasperkamperman.com's original code: http://ardx.org/KASP

Faux buttons:
 Define a range of values corresponding to a discrete button.
if(analogRead(0) > minValue && 
analogRead(0) < maxValue) {
buttonAction()
}

Then cover the soft pot with a drawn/printed button pattern."