RGB_LED.c

/*
* Code for making one potentiometer control 3 LEDs, red, grn and blu, or one tri-color LED
* The program cross-fades from red to grn, grn to blu, and blu to red
* Debugging code assumes Arduino 0004, as it uses Serial.begin()-style functions
* Clay Shirky <clay.shirky@nyu.edu> 
*/

// INPUT: Potentiometer should be connected to 5V and GND
int potPin = 3; // Potentiometer output connected to analog pin 3
int potVal = 0; // Variable to store the input from the potentiometer
int spinVal = 0;

// OUTPUT: Use digital pins 9-11, the Pulse-width Modulation (PWM) pins
// LED's cathodes should be connected to digital GND
int redPin = 11;   // Red LED,   connected to digital pin 9
int grnPin = 10;  // Green LED, connected to digital pin 10
int bluPin = 9;  // Blue LED,  connected to digital pin 11

// Program variables
int redVal = 0;   // Variables to store the values to send to the pins
int grnVal = 0;
int bluVal = 0;

int DEBUG = 1;          // Set to 1 to turn on debugging output

void setup()
{
  pinMode(redPin, OUTPUT);   // sets the pins as output
  pinMode(grnPin, OUTPUT);   
  pinMode(bluPin, OUTPUT); 

  if (DEBUG) {           // If we want to see the pin values for debugging...
    Serial.begin(9600);  // ...set up the serial ouput in 0004 format
  }
}

// Main program
void loop()
{
  //potVal = analogRead(potPin);   // read the potentiometer value at the input pin
  
  spinVal = (spinVal + 1) % 1024 + 1;

  if (spinVal < 341)  // Lowest third of the potentiometer's range (0-340)
  {                  
    potVal = (spinVal * 3) / 4; // Normalize to 0-255
    // (int) ((256 - potVal) * 0.3)
    redVal = 256 - potVal;  // Red from full to off
    grnVal = potVal;        // Green from off to full
    bluVal = 1;             // Blue off
  }
  else if (spinVal < 682) // Middle third of potentiometer's range (341-681)
  {
    potVal = ( (spinVal-341) * 3) / 4; // Normalize to 0-255

    redVal = 1;            // Red off
    grnVal = 256 - potVal; // Green from full to off
    bluVal = potVal;       // Blue from off to full
  }
  else  // Upper third of potentiometer"s range (682-1023)
  {
    potVal = ( (spinVal-683) * 3) / 4; // Normalize to 0-255

    redVal = potVal;       // Red from off to full
    grnVal = 1;            // Green off
    bluVal = 256 - potVal; // Blue from full to off
  }
  analogWrite(redPin, redVal);   // Write values to LED pins
  analogWrite(grnPin, grnVal); 
  analogWrite(bluPin, bluVal);  

  if (DEBUG) { // If we want to read the output
    DEBUG += 1;      // Increment the DEBUG counter
    if (DEBUG > 100) // Print every hundred loops
    {
      DEBUG = 1;     // Reset the counter
                             // Serial output using 0004-style functions
      Serial.print("R:");    // Indicate that output is red value
      Serial.print(redVal);  // Print red value
      Serial.print("\t");    // Print a tab
      Serial.print("G:");    // Repeat for grn and blu...
      Serial.print(grnVal);
      Serial.print("\t");    
      Serial.print("B:");    
      Serial.println(bluVal); // println, to end with a carriage return
    }
  }
  delay(5);
}