【第０７回】 とりあえずArduinoに書き込んでみる

// constants won't change. Used here to 

// set pin numbers:

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

// Variables will change:

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

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

// the follow variables is a long because the time, measured in miliseconds,

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

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);

  }

}