/*
  Arrays and Button (Christmas Tree)
  
  The circuit:
  - 5 LEDs from pins 8 through 12 to ground, with 100 Ohms resistors
  - pushbutton attached to pin 6 from +5V
  - 10K resistor attached to pin 6 from ground
  
  This example code is in the public domain.
  http://www.arduino.cc/en/Tutorial/Button
  http://www.arduino.cc/en/Tutorial/Array
*/

int timer = 300; // The higher the number, the slower the timing.
int ledPins[] = {
  12,11,10,9,8}; // an array of pin numbers to which LEDs are attached
int pinCount = 5; // the number of pins (i.e. the length of the array)

int buttonPin = 6; // the number of the pushbutton pin
int buttonState = 0; // variable for reading the pushbutton status

void setup() {
  // the array elements are numbered from 0 to (pinCount - 1).
  // use a for loop to initialize each pin as an output:
  for (int thisPin = 0; thisPin < pinCount; thisPin++) {
    pinMode(ledPins[thisPin], OUTPUT);
  }
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
 
   // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
    // turn LED on:
     digitalWrite(12, HIGH);digitalWrite(11, HIGH);
     digitalWrite(10, HIGH);digitalWrite(9, HIGH);
     digitalWrite(8, HIGH);
     delay(timer*10);
    
  } else {
    // turn LED off:
    // loop from the lowest pin to the highest:
  for (int thisPin = 0; thisPin < pinCount; thisPin++) {
    // turn the pin on:
    digitalWrite(ledPins[thisPin], HIGH);
    delay(timer);
    // turn the pin off:
    digitalWrite(ledPins[thisPin], LOW);
  }
  // loop from the highest pin to the lowest:
  for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) {
    // turn the pin on:
    digitalWrite(ledPins[thisPin], HIGH);
    delay(timer);
    // turn the pin off:
    digitalWrite(ledPins[thisPin], LOW);
  }
  }
}