Période 2

// constants won't change. Used here to set a pin number:

const int ledPin = LED_BUILTIN;  // the number of the LED pin

// Variables will change:

int ledState = LOW;  // ledState used to set the LED

// Generally, you should use "unsigned long" for variables that hold time

// The value will quickly become too large for an int to store

unsigned long previousMillis = 0;  // will store last time LED was updated

// constants won't change:

const long interval = 1000;  // interval at which to blink (milliseconds)

void setup() {

  // set the digital pin as output:

  pinMode(ledPin, OUTPUT);

}

void loop() {

  // here is where you'd put code that needs to be running all the time.

  // check to see if it's time to blink the LED; that is, if the difference

  // between the current time and last time you blinked the LED is bigger than

  // the interval at which you want to blink the LED.

  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {

    // save the last time you blinked the LED

    previousMillis = currentMillis;

    // if the LED is off turn it on and vice-versa:

    if (ledState == LOW) {

      ledState = HIGH;

    } else {

      ledState = LOW;

    }

    // set the LED with the ledState of the variable:

    digitalWrite(ledPin, ledState);

  }

}

// constants won't change. Used here to set a pin number:
const int ledPin = LED_BUILTIN;  // the number of the LED pin

// Variables will change:
int ledState = LOW;  // ledState used to set the LED

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;  // will store last time LED was updated

// constants won't change:
const long interval = 1000;  // interval at which to blink (milliseconds)

void setup() {
  // set the digital pin as output:
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // here is where you'd put code that needs to be running all the time.

  // check to see if it's time to blink the LED; that is, if the difference
  // between the current time and last time you blinked the LED is bigger than
  // the interval at which you want to blink the LED.
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW) {
      ledState = HIGH;
    } else {
      ledState = LOW;
    }

    // set the LED with the ledState of the variable:
    digitalWrite(ledPin, ledState);
  }
}

/*

  Debounce

*/

// constants won't change. They're used here to set pin numbers:

const int buttonPin = 3;  // the number of the pushbutton pin

const int ledPin = 13;    // the number of the LED pin

// Variables will change:

int ledState = HIGH;        // the current state of the output pin

int buttonState;            // the current reading from the input pin

int lastButtonState = LOW;  // the previous reading from the input pin

// the following variables are unsigned longs because the time, measured in

// milliseconds, will quickly become a bigger number than can be stored in an int.

unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled

unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

void setup() {

  pinMode(buttonPin, INPUT);

  pinMode(ledPin, OUTPUT);

  // set initial LED state

  digitalWrite(ledPin, ledState);

}

void loop() {

  // read the state of the switch into a local variable:

  int reading = digitalRead(buttonPin);

  // check to see if you just pressed the button

  // (i.e. the input went from LOW to HIGH), and you've waited long enough

  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:

  if (reading != lastButtonState) {

    // reset the debouncing timer

    lastDebounceTime = millis();

  }

  if ((millis() - lastDebounceTime) > debounceDelay) {

    // whatever the reading is at, it's been there for longer than the debounce

    // delay, so take it as the actual current state:

    // if the button state has changed:

    if (reading != buttonState) {

      buttonState = reading;

      // only toggle the LED if the new button state is HIGH

      if (buttonState == HIGH) {

        ledState = !ledState;

      }

    }

  }

  // set the LED:

  digitalWrite(ledPin, ledState);

  // save the reading. Next time through the loop, it'll be the lastButtonState:

  lastButtonState = reading;

}

/*
  Debounce

*/

// constants won't change. They're used here to set pin numbers:
const int buttonPin = 3;  // the number of the pushbutton pin
const int ledPin = 13;    // the number of the LED pin

// Variables will change:
int ledState = HIGH;        // the current state of the output pin
int buttonState;            // the current reading from the input pin
int lastButtonState = LOW;  // the previous reading from the input pin

// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);

  // set initial LED state
  digitalWrite(ledPin, ledState);
}

void loop() {
  // read the state of the switch into a local variable:
  int reading = digitalRead(buttonPin);

  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the LED if the new button state is HIGH
      if (buttonState == HIGH) {
        ledState = !ledState;
      }
    }
  }

  // set the LED:
  digitalWrite(ledPin, ledState);

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;
}

const byte ledPin = 13;

const byte interruptPin = 3;  // input pin that the interruption will be attached to

volatile byte state = LOW;  // variable that will be updated in the ISR

void setup() {

  pinMode(ledPin, OUTPUT);

  pinMode(interruptPin, INPUT);

  attachInterrupt(digitalPinToInterrupt(interruptPin), blink, CHANGE);

}

void loop() {

  digitalWrite(ledPin, state);

}

void blink() {

  state = !state;

}

const byte ledPin = 13;
const byte interruptPin = 3;  // input pin that the interruption will be attached to
volatile byte state = LOW;  // variable that will be updated in the ISR

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(interruptPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(interruptPin), blink, CHANGE);
}

void loop() {
  digitalWrite(ledPin, state);
}

void blink() {
  state = !state;
}