Initial commit

## Example files for the title:  

# Getting Started with Arduino 3rd Edition, by Massimo Banzi

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// Blinking LED

const int LED = 13; // LED connected to

                    // digital pin 13

void setup()

{

  pinMode(LED, OUTPUT);    // sets the digital

                           // pin as output

}

void loop()

{

  digitalWrite(LED, HIGH);   // turns the LED on

  delay(1000);               // waits for a second

  digitalWrite(LED, LOW);    // turns the LED off

  delay(1000);               // waits for a second

}

// Turn on LED while the button is pressed

const int LED = 13;   // the pin for the LED

const int BUTTON = 7; // the input pin where the

                      // pushbutton is connected

int val = 0;          // val will be used to store the state

                      // of the input pin

void setup() {

  pinMode(LED, OUTPUT);   // tell Arduino LED is an output

  pinMode(BUTTON, INPUT); // and BUTTON is an input

}

void loop(){

  val = digitalRead(BUTTON); // read input value and store it

  // check whether the input is HIGH (button pressed)

  if (val == HIGH) {

    digitalWrite(LED, HIGH); // turn LED ON

  } else {

    digitalWrite(LED, LOW);

  }

}

// Turn on LED when the button is pressed and keep it on after it is released

const int LED = 13;   // the pin for the LED

const int BUTTON = 7; // the input pin where the

                      // pushbutton is connected

int val = 0;    // val will be used to store the state

                // of the input pin

int state = 0;  // 0 = LED off while 1 = LED on

void setup() {

  pinMode(LED, OUTPUT);   // tell Arduino LED is an output

  pinMode(BUTTON, INPUT); // and BUTTON is an input

}

void loop() {

  val = digitalRead(BUTTON); // read input value and store it

  // check if the input is HIGH (button pressed)

  // and change the state

  if (val == HIGH) {

    state = 1 - state;

  }

  if (state == 1) {

    digitalWrite(LED, HIGH); // turn LED ON

  } else {

    digitalWrite(LED, LOW);

  }

}

// New and improved button press formula!

const int LED = 13;   // the pin for the LED

const int BUTTON = 7; // the input pin where the

                      // pushbutton is connected

int val = 0;     // val will be used to store the state

                 // of the input pin

int old_val = 0; // this variable stores the previous

                 // value of "val"

int state = 0;   // 0 = LED off and 1 = LED on

void setup() {

  pinMode(LED, OUTPUT);   // tell Arduino LED is an output

  pinMode(BUTTON, INPUT); // and BUTTON is an input

}

void loop(){

  val = digitalRead(BUTTON); // read input value and store it

                             // yum, fresh

 // check if there was a transition

 if ((val == HIGH) && (old_val == LOW)){

   state = 1 - state;

 }

 old_val = val;  // val is now old, let's store it

 if (state == 1) {

   digitalWrite(LED, HIGH); // turn LED ON

 } else {

   digitalWrite(LED, LOW);

 }

}