Arduino SOS (Work in Progress)

sos.c

/**
 * SOS for a single LED
 *
 * @author Nathan Hyde
 * @version 2016-08-31
 */

//  Define the Pins
int LED=13; // use the arduino's built-in led on pin 13

int DOT_DELAY = 100; // short delay ms
int DASH_DELAY = 300; // long delay ms
int PAUSE_DELAY = 500; // character delay in ms

void setup() {
   pinMode(LED, OUTPUT);  // set the LED pin to an output
}

void loop() {
  SOS(LED);
}

/**
 * Flashes a single LED for the sequence of dots and dashes representing S-O-S
 *
 * @param led - The LED to adjust
 */
void SOS(int led) {
  S(led);
  O(led);
  S(led);
  delay(PAUSE_DELAY);
}

/**
 * Flashes an LED on and off for DOT_DELAY ms.
 *
 * @param led - The LED to adjust
 */
void Dot(int led) {
  LedOnOff(led, DOT_DELAY);
}

/**
 * Flashes an LED on and off for DASH_DELAY ms.
 *
 * @param led - The LED to adjust
 */
void Dash(int led) {
  LedOnOff(led, DASH_DELAY);
}

/**
 * Flashes an LED on and off for the given delay.
 *
 * @param led - The LED to adjust
 * @param delay_ms - Number of miliseconds to wait between turning the LED on and off.
 */
void LedOnOff(int led, int delay_ms) {
  LedOff(led);
  delay(delay_ms);
  digitalWrite(led, HIGH);
  delay(delay_ms);
}

void LedOff(int led) {
  digitalWrite(led, LOW);
}

void S(int led) {
  for(int i=0; i < 3; i++) {
    Dot(led);
  }
  LedOff(led);
}

void O(int led) {
  for(int i=0; i < 3; i++) {
    Dash(led);
  }
  LedOff(led);
}