/*
* 3 Potentiometer AnalogInput
*
* Pot 1: Controls Fade of all 3 lights
* Pot 2: Controls Blonk Rate of all 3 lights
* Pot 3: Cycles through which lights are on!
*
* by Michael Manoochehri
* Based on one pot dims, the other pot changes the blinking rate found here:
* http://www.arduino.cc/en/Tutorial/AnalogInput
*/

// 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 = 0; // Set to 1 to output values
int DEBUG = 0; // 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) / 4;  // read input pins, convert to 0-255 scale
Serial.print("A: ");
Serial.println(aVal);

// Reads Potentiometer 2, for Blink Rate

bVal = analogRead(bIn) / 12;
Serial.print("B: ");
Serial.println(bVal);

// Reads Potentiometer 3, for color toggle
cVal = analogRead(cIn);
Serial.print("C: ");
Serial.println(cVal);

// This long series of if /else if's decides which colors to display

// Yes, there was probably a more elegant way to code this...

if (cVal >= 0 && cVal <= 125)
{
analogWrite(aOut, aVal);    // Send new values to LEDs
analogWrite(bOut, 0);
analogWrite(cOut, 0);
Serial.println("Only LED A!");
}
else if (cVal > 125 && cVal <= 250)
{
analogWrite(aOut, 0);    // Send new values to LEDs
analogWrite(bOut, aVal);
analogWrite(cOut, 0);
Serial.println("Only LED B!");
}
else if (cVal > 250 && cVal <= 375)
{
analogWrite(aOut, 0);    // Send new values to LEDs
analogWrite(bOut, 0);
analogWrite(cOut, aVal);
Serial.println("Only LED C!");
}
else if (cVal > 375 && cVal <= 500)
{
analogWrite(aOut, aVal);    // Send new values to LEDs
analogWrite(bOut, aVal);
analogWrite(cOut, 0);
Serial.println("Only LEDs A & B!");
}
else if (cVal > 500 && cVal <= 625)
{
analogWrite(aOut, aVal);    // Send new values to LEDs
analogWrite(bOut, 0);
analogWrite(cOut, aVal);
Serial.println("Only LEDs A & C!");
}
else if (cVal > 625 && cVal <= 750)
{
analogWrite(aOut, 0);    // Send new values to LEDs
analogWrite(bOut, aVal);
analogWrite(cOut, aVal);
Serial.println("Only LEDs C & B!");
}
else if (cVal > 750)
{
analogWrite(aOut, aVal);    // Send new values to LEDs
analogWrite(bOut, aVal);
analogWrite(cOut, aVal);
Serial.println("All LEDs!!");
}
else
{
analogWrite(aOut, 0);    // Send new values to LEDs
analogWrite(bOut, 0);
analogWrite(cOut, 0);
Serial.println("NO LEDs!");
}

delay(bVal);                  // stop the program for some time, meaning, LED is on for this time
analogWrite(aOut, 0);         // dim LED to completely dark (zero)
analogWrite(bOut, 0);         // dim LED to completely dark (zero)
analogWrite(cOut, 0);         // dim LED to completely dark (zero)
delay(bVal);                  // stop the program for some time, meaning, LED is OFF for this time

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");

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);
}
}
}