/*
 * blink4.pde
 *
 * Intro-Arduino (Lab 2) first DIY program.
 * Flash the leftmost (4) LEDs in sequence, pausing
 * DELAYTIME_BETWEEN milliseconds between individual LEDs,
 * followed by a delay of DELAYTIME_AFTER after the last,
 * repeating forever.
 *
 * Written by Eric B. Wertz for ME106.
 * Last modified by Eric B. Wertz on January 13, 2011.
 * Version 1.02
 */
#define DELAYTIME_BETWEEN 100  // 100 msec (0.1s)
#define DELAYTIME_AFTER   400  // 400 msec (0.4s)

#define PIN_LED0    11
#define PIN_LED1     9
#define PIN_LED2     6
#define PIN_LED3     3
#define PIN_BUTTON0 12
#define PIN_BUTTON1  8
#define PIN_BUTTON2  7
#define PIN_BUTTON3  4

// set of LEDs to use, and number of array elements
const byte ledPins[]    = { PIN_LED0, PIN_LED1, PIN_LED2, PIN_LED3 };
const byte numberOfLeds = sizeof(ledPins)/sizeof(byte);

void setup()
{
  byte i;

  for (i=0; i < numberOfLeds; i++)
    pinMode(ledPins[i], OUTPUT);

  pinMode(PIN_BUTTON0, INPUT);
  digitalWrite(PIN_BUTTON0, HIGH); // enable internal pullup resistor
}
 
/*
 * Flash the LEDs specified in the array in sequence, pausing at the
 * end only if Button0 (active-low) is pressed.
 */
void loop()
{
  byte i;

  for (i=0; i < numberOfLeds; i++) {
    digitalWrite(ledPins[i], HIGH);
    delay(DELAYTIME_BETWEEN);
    digitalWrite(ledPins[i], LOW);
    delay(DELAYTIME_BETWEEN);
  }

  while (digitalRead(PIN_BUTTON0) == LOW)
    ;

  delay(DELAYTIME_AFTER);
}