...a simple LED controller

gistfile1.txt

/*
  Button
 
 Turns on and off a light emitting diode(LED) connected to digital  
 pin 13, when pressing a pushbutton attached to pin 2. 
 
 
 The circuit:
 * LED attached from pin 13 to ground 
 * pushbutton attached to pin 2 from +5V
 * 10K resistor attached to pin 2 from ground
 
 * Note: on most Arduinos there is already an LED on the board
 attached to pin 13.
 
 
 created 2005
 by DojoDave <http://www.0j0.org>
 modified 30 Aug 2011
 by Tom Igoe
 
 This example code is in the public domain.
 
 http://www.arduino.cc/en/Tutorial/Button
 */

// constants won't change. They're used here to 
// set pin numbers:
const int buttonPin = 2;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin
const int _2ndledPin =  12;      // the number of the LED pin

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);     
  pinMode(_2ndledPin, OUTPUT); 
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT_PULLUP); 
}

void loop(){
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
//  digitalWrite(ledPin, LOW);
  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == LOW) {     
    // turn LED on:    
    digitalWrite(ledPin, HIGH);  
    digitalWrite(_2ndledPin, HIGH);
  } 
  else {
    // turn LED off:
    digitalWrite(ledPin, LOW); 
    digitalWrite(_2ndledPin, LOW);
  }
}