// Interactive Timer/Fader 01
//
// A delay-free timer for a single LED that fades in and out
// and cascades 6 faders. 
// Added a switch to reset and added a poteniometer to 
// change the timing.

// Timer variables
long timer1 = 0; long timer2 = 0; long timer3 = 0;
long timer4 = 0; long timer5 = 0; long timer6 = 0;
int offset = 10;              // Change this for faster or slower fades                     
// Pin variables
int pwm1 = 11; int pwm2 = 10; int pwm3 = 9;
int pwm4 = 6;  int pwm5 = 5;  int pwm6 = 3;
// Direction variable
int upDown1 = 1; int upDown2 = 1; int upDown3 = 1; 
int upDown4 = 1; int upDown5 = 1; int upDown6 = 1; 
// pwm value holding variable
int val1 = 1; int val2 = 1; int val3 = 1; 
int val4 = 1; int val5 = 1; int val6 = 1; 
// flag variables
boolean flag1 = 0; boolean flag2 = 0; boolean flag3 = 0;
boolean flag4 = 0; boolean flag5 = 0; 
boolean constantOn = 0;		// Variable to tell loop() light cycle to keep
							// repeating
//Setup
void setup() {                  // The standard stuff...
    Serial.begin(9600);         // Setup the serial communications so we can debug
    timer1 = millis();
    // Set the pin for the digital switch to INPUT
    pinMode(12,INPUT);    
    // Set pinModes for PWMs
    pinMode(pwm1,OUTPUT); pinMode(pwm2,OUTPUT); pinMode(pwm3,OUTPUT); 
    pinMode(pwm4,OUTPUT); pinMode(pwm5,OUTPUT); pinMode(pwm6,OUTPUT); 
}

// Das Loop...
void loop() {
  // Timer
  if( (timer1 + offset) < millis() ) { 
     doFade1();           
     timer1 = millis();
  }
  // DIGITAL SWITCH
  if(!digitalRead(12))   { 
    constantOn = 0;			// This keeps the loop from replaying the light cycle
    resetFade(); 			// This does the light cycle, but only once, because
  }							// constantOn is off.
  // ANALOG SWITCH 
  if(analogRead(1)>1000) { 
    constantOn = 1; 
  }
  // EXPERIMENT WITH DIFFERENT SENSORS
  // Use one of the following senors to modify the
  // value of "offset", and thereby make the LED's
  // flash faster or slower
  // POTENTIOMETER
  // This pot has a range from ~650 to 1023. 
  // Serial.println(analogRead(2));[
  // Change that to a range from 0 to 50 or so
  // then set offset to change the fade timer
  //    offset = (analogRead(2) - 650)/10;
  // PHOTORESISTOR
  // This photoresistor has a range from ~10 to ~225.
  // Serial.println(analogRead(4));
  // Change that range to 1 to 10 or so
  //   offset = analogRead(4)/20;
}

// Reset Fade Function
void resetFade() {
  Serial.println("Resetting fade...");
  // pwm value variables
  val1 = 1; val2 = 1; val3 = 1; 
  val4 = 1; val5 = 1; val6 = 1; 
  // Direction variables
  upDown1 = 1; upDown2 = 1; upDown3 = 1; 
  upDown4 = 1; upDown5 = 1; upDown6 = 1; 
  // flag variables
  flag1 = 0; flag2 = 0; flag3 = 0;
  flag4 = 0; flag5 = 0; 
}

// Fade function
void doFade1() {
  if(val1 >= 70) { upDown1 = -1; }  
  if(val1 <= 0)  { upDown1 = 0;  } 
  if(val1 == 30) { flag1 = 1;    } 
  val1 = val1 + (upDown1);    
  analogWrite(pwm1, val1);   
  if(flag1) {
    if(val2 >= 70) { upDown2 = -1; }  
    if(val2 <= 0)  { upDown2 = 0;  } 
    if(val2 == 30) { flag2 = 1;    } 
    val2 = val2 + (upDown2);
    analogWrite(pwm2, val2);
  }
  if(flag2) {
    if(val3 >= 70) { upDown3 = -1; }  
    if(val3 <= 0)  { upDown3 = 0;  } 
    if(val3 == 30) { flag3 = 1;    } 
    val3 = val3 + (upDown3);
    analogWrite(pwm3, val3);
  }
  if(flag3) {
    if(val4 >= 70) { upDown4 = -1; }  
    if(val4 <= 0)  { upDown4 = 0;  } 
    if(val4 == 30) { flag4 = 1;    } 
    val4 = val4 + (upDown4);
    analogWrite(pwm4, val4);
  }
  if(flag4) {
    if(val5 >= 70) { upDown5 = -1; }  
    if(val5 <= 0)  { upDown5 = 0;  } 
    if(val5 == 30) { flag5 = 1;    } 
    val5 = val5 + (upDown5);
    analogWrite(pwm5, val5);
  }
  if(flag5) {
    if(val6 >= 70) { upDown6 = -1; }  
    if(val6 <= 0)  { 
      upDown6 = 0;  
      if(constantOn){		// if constantOn is true (set by the analog switch)
        resetFade();		// then reset the fade and cycle the lights until
      }						// constantOn is false.
    } 
    val6 = val6 + (upDown6);
    analogWrite(pwm6, val6);
  }
}