/*
  Creates flame effect by flickering digital ports 2, 3, 4


*/

#define NUMLEDS 3

// digital pin numbers of the LEDs
const int ledPins[NUMLEDS] = {1,2,3};
// time that the LEDs are on and off
const long timeOn[NUMLEDS] = {200, 73, 80};           // milliseconds
const long timeOff[NUMLEDS] = {40, 41, 5};           // milliseconds


int ledStates[NUMLEDS];

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long currentMillis = 0;
unsigned long previousMillis[NUMLEDS];       // will store last time LED was updated


void setup() {
  // set the digital pins as output:
  for (int i=0; i<NUMLEDS; i++) {
   pinMode(ledPins[i], OUTPUT);
   ledStates[i] = LOW;
   previousMillis[i] = 0;
  }
}

void loop() {
  // here is where you'd put code that needs to be running all the time.

  // check to see if it's time to blink the LED; that is, if the difference
  // between the current time and last time you blinked the LED is bigger than
  // the interval at which you want to blink the LED.
  currentMillis = millis();

  for (int i=0; i<NUMLEDS; i++) {
    updLED (i);
  }

}

// Check if LED state should be changed and if so change it
void updLED(int ledNum) {
  // If currently off
  if (ledStates[ledNum] == LOW) {
    if (currentMillis - previousMillis[ledNum] >= timeOff[ledNum]) {
      // save the last time you blinked the LED
      previousMillis[ledNum] = currentMillis;
      // Turn on
      
      ledStates[ledNum] = HIGH;
    }
  }
  else {
    if (currentMillis - previousMillis[ledNum] >= timeOff[ledNum]) {
      // save the last time you blinked the LED
      previousMillis[ledNum] = currentMillis;
      // Turn on
      ledStates[ledNum] = LOW;
    }    


    // set the LED with the ledState of the variable
    digitalWrite(ledPins[ledNum], ledStates[ledNum]);
  }
}