IR Sensor + Multi-LED

Multicolor LED + IR sensor from Jessica Floeh on Vimeo.

Click below for the code:

// Analog pin settings
int sharpIR = 2;    // connected to the analog pin 2, analog gnd, analog 5v

// Digital pin settings
int redLED = 9;   // full-color LED connected to digital pins 9, 10 and 11
int blueLED = 10;  //   (Connect cathode to analog 3v3)
int greenLED = 11;

// Values
int sharpVal = 0;   // the variable to store the input from the sharp IR sensor
int redVal = 0;   // the variable to store the value of red LED
int greenVal = 0;  // the variable to store the value of green LED
int blueVal = 0;  // the variable to store the value of blue LED

// Variables for comparing values between loops
int i = 0;            // Loop counter
int wait = (1000);    // Delay between most recent IR adjustment and output

int sens         = 3; // Sensitivity threshold, to prevent small changes in
                      // pot values from triggering false reporting
// FLAGS
int PRINT = 1; // Set to 1 to output values

void setup()
{
  pinMode(redLED, OUTPUT);   // sets the digital pins as output
  pinMode(blueLED, OUTPUT);   
  pinMode(greenLED, OUTPUT);
  Serial.begin(9600);     // Open serial communication for reporting
}

void loop()
{
  i += 1; // Count loop

  sharpVal = analogRead(sharpIR);  // read input pins, convert to 0-255 scale

  if (sharpVal< 341)
  {
    sharpVal= (sharpVal* 3) / 4; //normalize to 0-255
    redVal= 255-sharpVal;
    greenVal= sharpVal;
    blueVal= 1; //blue off
  } //end of if
  else if (sharpVal< 682)
  {
    sharpVal= ((sharpVal-341)*3) / 4; //normalize to 0-255
    redVal= 1; //red off
    greenVal= 255-sharpVal;
    blueVal= sharpVal;
  } //end of else if
  else
  {
    sharpVal= ((sharpVal-682)*3)/ 4; //normalize to 0-255
    redVal= sharpVal;
    greenVal= 1; //green off
    blueVal= 255-sharpVal;
  } //end of else

  analogWrite(redLED, redVal);    // Send the new value to LEDs
  analogWrite(blueLED, blueVal);
  analogWrite(greenLED, greenVal);

  if (i % wait == 0)                // If enough time has passed...
  {   
    if (sharpVal > sens )   // If old and new values differ
                                                  // above sensitivity threshold
    {
      if (PRINT)                    // ...and if the PRINT flag is set...
      {
        Serial.print("The value of Infrared Sensor is: ");        // ...then print the values.
        Serial.print(sharpVal);         

        PRINT = 0;
      }
    }
    else
    {
      PRINT = 1;  // Re-set the flag   
    }

  }
}