/* 

FUN WITH IR, SMOOTHING, MAPPING AND COLOR!!!!

smoothing and mapping used to blend between R,G, and B using
a tri-color LED (or three different LEDs).

- joe saavedra, cecilia elguero, kirsten halterman

*/
  
#define NUMREADINGS 30

int readings[NUMREADINGS];                // the readings from the analog input
int index = 0;                            // the index of the current reading
int total = 0;                            // the running total
int average = 0;                          // the average

int inputPin = 0;						  // SHARP IR SENSOR

int ledPinR = 11;						  // VARIOUS LEGS FOR TRI COLOR LED
int ledPinG = 10;						  // COULD ALSO BE 3 DIFFERENT LEDs
int ledPinB = 9;

void setup()
{
  Serial.begin(9600);                     // initialize serial communication with computer
  for (int i = 0; i < NUMREADINGS; i++)
    readings[i] = 0;                      // initialize all the readings to 0
}

void loop()
{
  total -= readings[index];               // subtract the last reading
  readings[index] = analogRead(inputPin); // read from the sensor
  total += readings[index];               // add the reading to the total
  index = (index + 1);                    // advance to the next index

  if (index >= NUMREADINGS){               // if we're at the end of the array...
    index = 0;                  // ...wrap around to the beginning
  }
  
  average = total / NUMREADINGS;          // calculate the average
  
  if (average < 6){                        // anything lower than 6, is now ZERO so LED goes OFF
    average = 0;
  }
  
  Serial.println(average);                // send it to the computer (as ASCII digits)
  
 // Divide the sensor's range into >>perceptually<< correct proportions among each LED pin
 // mapping is used to scale each range (which is different) to 0 - 255
 
  if (var < 50){						  
    analogWrite(ledPinR, map(average,0,50,0,255));  // off --> red
    analogWrite(ledPinG, 0);
    analogWrite(ledPinB, 0);}
  if (var >= 50 && var <= 150){						// red --> green
    analogWrite(ledPinR, map(average,50,150,255,0));
    analogWrite(ledPinG, map(average,50,150,0,255));
    analogWrite(ledPinB, 0);}
  if (var > 150){									// green --> blue
    analogWrite(ledPinR, 0);						
    analogWrite(ledPinG, map(average,150,600,255,0));
    analogWrite(ledPinB, map(average,150,600,0,255));}
}