Push Button Switch

/**

* @file: switch sensor example

* @date: 3/29/2011

*

* @DESCRIPTION

* reads a digital input and prints results.

* needs a contact switch

*/

int buttonState =0;

//--- Function: Setup ()

void setup()

{

    pinMode(buttonPin, INPUT);

    Serial.begin(9600);

    delay(25);

}

//--- Function: loop ()

void loop()

{

    // Reads a digital input on pin 2

    buttonState = digitalRead(buttonPin);

    //prints the result to the serial monitor

    Serial.println(buttonState, DEC);

    if (buttonState == HIGH)

    else

        Serial.println("not pressed");

}