WdKA basic arduino workshop Part 2: Light and Switch

useless_switch_sketch.ino

/************************************************************/
/* Sample useless machine code                              */
/* WdKA basic arduino workshop                              */
/*                                                          */
/* Part 2: Light and Switch                                 */
/* Simon de Bakker <simon@simbits.nl>                       */
/************************************************************/

/* pin definitions (what is connected to which arduino pin) */
#define LED_PIN          12
#define SWITCH_PIN       8

void setup() {
  /* set the directions of each pin */
  pinMode(LED_PIN, OUTPUT);
  pinMode(SWITCH_PIN, INPUT);
  
  /* just a small routine to let us know setup is finished */
  /* turn on our LED */
  digitalWrite(LED_PIN, HIGH);
  /* wait half a second */
  delay(500);
  /* turn our LED off again */
  digitalWrite(LED_PIN, LOW);
}

void loop() {
  /* check if the switch is toggled */
  if ( digitalRead(SWITCH_PIN) == HIGH ) {
    /* A local variable to hold the amount of ms to wait */
    int wait_ms;

    /* turn the LED on */
    digitalWrite(LED_PIN, HIGH);
  
    /* put a random value between 200 and 2000 in wait_ms */
    wait_ms = random(10, 500);
    /* wait for the amount of ms stored in wait_ms */
    delay(wait_ms);
  
    /* turn the LED off */
    digitalWrite(LED_PIN, LOW);
    
    wait_ms = random(10, 500);
    delay(wait_ms);
  }
}