Task 32 - outputting the button result to the SM

/*
* Project: button_task_32
* Author: Jane-Maree Howard
* Date: Monday 22/03/2010
* Platform: Arduino 18
* Purpose: To send the result of the 'button' operation.
* to the Serial Monitor

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
modified 17 Jun 2009
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

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

void setup()
{
// initialize the LED pin 13 as an output:
pinMode(ledPin, OUTPUT);
// initialize the pushbutton pin 2 as an input:
pinMode(buttonPin, INPUT);
/* We'll send the button state & the LED state
to the Serial monitor */
Serial.begin(9600); // baud rate 9600 should be set on the SM
}//end setup()

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(ledPin, HIGH);
Serial.println("Button pressed - LED on");
}// if..
else
{
// turn LED off:
digitalWrite(ledPin, LOW);
Serial.println("--LED off");
}//..else..
}//end loop()