3 Potentiometers

To start, I connected 3 potentiometers to read input from Analog pins 0-2. Initially, I used the provided "Coffee-cup Color Mixer" code to test. The prewritten code enabled me to adjust the brightness of each LED individually.

I then modified the code to change the role of each potentiometer, so that one potentiometer controlled the rate of blinking and another controlled the brightness of all 3 LEDs. The third potentiometer adjusted which LED of the 3 was the one blinking. 

/*

* Code adapted from "Coffee-cup" Color Mixer:

* Code for mixing and reporting PWM-mediated color

* Assumes Arduino 0004 or higher, as it uses Serial.begin()-style communication 

*/

// Analog pin settings

int aIn = 0;    // Potentiometers connected to analog pins 0, 1, and 2

int bIn = 1;    //   (Connect power to 5V and ground to analog ground)

int cIn = 2;  

// Digital pin settings

int aOut = 9;   // LEDs connected to digital pins 9, 10 and 11

int bOut = 10;  //   (Connect cathodes to digital ground)

int cOut = 11;  

// Values

int aVal = 0;   // Variables to store the input from the potentiometers

int bVal = 0;  

int cVal = 0;  

// Variables for comparing values between loops

int i = 0;            // Loop counter

int wait = (1000);    // Delay between most recent pot adjustment and output

int checkSum     = 0; // Aggregate pot values

int prevCheckSum = 0;

int sens         = 3; // Sensitivity theshold, to prevent small changes in 

                      // pot values from triggering false reporting

// FLAGS

int PRINT = true; // Set to 1 to output values

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

void setup()

{

  pinMode(aOut, OUTPUT);   // sets the digital pins as output

  pinMode(bOut, OUTPUT);   

  pinMode(cOut, OUTPUT); 

  Serial.begin(9600);     // Open serial communication for reporting

}

void loop()

{

  i += 1; // Count loop

  aVal = analogRead(aIn)*2;  // Controls rate of blinking

  bVal = analogRead(bIn)/4; //Controls overall brightness of all 3 LEDs  

  cVal = analogRead(cIn);   // Controls which LED is blinking

  if (cVal < 255){

  analogWrite(aOut, 255); // Only Red

  delay(aVal);

  analogWrite(aOut, bVal/16);

  analogWrite(bOut, bVal/8);

  analogWrite(cOut, bVal/8);

  }

  else if (cVal < 509){ //

  analogWrite(bOut, 255);

  delay(aVal);

  analogWrite(bOut, bVal/16);

  analogWrite(aOut, bVal/8);

  analogWrite(cOut, bVal/8);

  }

  else{

  analogWrite(cOut, 255);

  delay(aVal);

  analogWrite(cOut, bVal/16);

  analogWrite(aOut, bVal/8);

  analogWrite(bOut, bVal/8);

  }

  Serial.print(aVal/1000);

  Serial.print('\n');

  if (i % wait == 0)                // If enough time has passed...

  {    

    checkSum = aVal+bVal+cVal;      // ...add up the 3 values.

    if ( abs(checkSum - prevCheckSum) > sens )   // If old and new values differ 

                                                  // above sensitivity threshold

    {

      if (PRINT)                    // ...and if the PRINT flag is set...

      {

        Serial.print("A: ");        // ...then print the values.

        Serial.print(aVal);         

        Serial.print("\t"); 

        Serial.print("B: ");        

        Serial.print(bVal);

        Serial.print("\t");

        Serial.print("C: ");                

        Serial.println(cVal); 

        PRINT = 0;

      }

    }  

    else

    {

      PRINT = 1;  // Re-set the flag   

    } 

    prevCheckSum = checkSum;  // Update the values

    if (DEBUG)   // If we want debugging output as well...

    {

      Serial.print(checkSum);

      Serial.print("<=>");

      Serial.print(prevCheckSum);

      Serial.print("\tPrint: ");

      Serial.println(PRINT);

    }

  }

}