//  Quick and basic sketch to demo the Power LED Shield
//  It assumes you have a Red, Green, Blue and White LED - one color each channel
//  But any combination of colors can be used on any channel

//  LED PWM output pins
#define RedPin 3
#define GrnPin 9
#define BluPin 10
#define WhtPin 11

//  Analog input pins for controlling the LEDs with potentiometers.
#define RedAdj 0
#define GrnAdj 1
#define BluAdj 2
#define WhtAdj 3

//  Uncomment this line to enable serial output of the LED values
//#define DEBUG

int Red;  // The state of the Red LED
int Grn;  // The state of the Green LED
int Blu;  // The state of the Blue LED
int Wht;  // The state of the White LED

void setup() {
//  Uncomment one or both of the following lines to change the PWM frequency.
//  See - http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1235060559/4#4 for more information.
//  The default is about 488Hz.

//  TCCR1B = TCCR1B & 0b11111000 | 0x02;  // Sets the PWM freq to about 3900 Hz on pins 3 and 11
//  TCCR2B = TCCR2B & 0b11111000 | 0x02;  // Sets the PWM freq to about 3900 Hz on pins 9 and 10

// Enable the serial console if DEBUG is defined above
#ifdef DEBUG
  Serial.begin(9600);
#endif

// Sets the LED control pins to outputs
  pinMode(RedPin, OUTPUT);
  pinMode(GrnPin, OUTPUT);
  pinMode(BluPin, OUTPUT);
  pinMode(WhtPin, OUTPUT);
}

//  This is a function that sets the LED brightness values when called below
void WriteLEDArray() {
  analogWrite(RedPin, Red);
  analogWrite(GrnPin, Grn);
  analogWrite(BluPin, Blu);
  analogWrite(WhtPin, Wht);
}

void loop() {
//  Produces random brightness values
//  Red = random(255);
//  Grn = random(255);
//  Blu = random(255);
//  Wht = random(255);

// or

//  Full brightness on all LEDs
//  Good for checking white balance and adjusting manual brightness
//  Red = 255;
//  Grn = 255;
//  Blu = 255;
//  Wht = 255;

// or

//  Controls the LEDs from input at the analog pins
//  The analog inputs range from 0-1023, but the PWM outputs range from 0-255.
//  So we use the map() function to scale the values.
//  Need a potentiometer on each of the 4 analog pins
  Red = map(analogRead(RedAdj),0,1023,0,255);
  Grn = map(analogRead(GrnAdj),0,1023,0,255);
  Blu = map(analogRead(BluAdj),0,1023,0,255);
  Wht = map(analogRead(WhtAdj),0,1023,0,255);

//  Call the function to set the LED values
  WriteLEDArray();
  
//  Write the LED values to the serial console if DEBUG is defined above
#ifdef DEBUG
  Serial.print(Red);
  Serial.print("\t");
  Serial.print(Grn);
  Serial.print("\t");
  Serial.print(Blu);
  Serial.print("\t");
  Serial.println(Wht);
#endif

//  Wait a second before doing it all again
  delay(1000);
}