Arduino gnampSOS

/*
  gnampSOS

  Using for example a vibration motor from a mobile phone in conjunction with an
  arduino running this basic sketch, a person in distress can summon
  help. Uses digital pins 13 and GND.

  The motor (or whatever) repeatedly relays an SOS signal in Morse code:-

  "... - - - ..."

  This could be effected by eg. placing the motor module against metal piping
  (ala 'prisoner telegraph').

  Dominic McGough 26th February 2012

 */

void setup() {
  // initialize the digital pin as an output.
  // Pin 13 has an LED connected on most Arduino boards:
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);   // turn the motor/whatever on
  delay(200);              // leave it on to make the first 'dot' of 'S'
  digitalWrite(13, LOW);    // turn the motor/whatever off
  delay(70);              // the first pause between dots
  digitalWrite(13, HIGH);   // turn the motor/whatever on
  delay(200);              // leave it on to make the second 'dot' of 'S'
  digitalWrite(13, LOW);    // turn the motor/whatever off
  delay(70);                // the second pause between dots
  digitalWrite(13, HIGH);   // turn the motor/whatever on
  delay(200);              // leave it on to make the third 'dot' of 'S'
  digitalWrite(13, LOW);    // turn the motor/whatever off
  delay(400);                // the pause between letters

  digitalWrite(13, HIGH);   // turn the motor/whatever on
  delay(315);              // leave it on to make the first 'dash' of 'O'
  digitalWrite(13, LOW);    // turn the motor/whatever off
  delay(200);              // the first pause between dashes
  digitalWrite(13, HIGH);   // turn the motor/whatever on
  delay(315);              // leave it on to make the second 'dash' of 'O'
  digitalWrite(13, LOW);    // turn the motor/whatever off
  delay(200);                // the second pause between dashes
  digitalWrite(13, HIGH);   // turn the motor/whatever on
  delay(315);              // leave it on to make the third 'dash' of 'O'
  digitalWrite(13, LOW);    // turn the motor/whatever off
  delay(400);                // the pause between letters

  digitalWrite(13, HIGH);   // turn the motor/whatever on
  delay(200);              // leave it on to make the first 'dot' of 'S'
  digitalWrite(13, LOW);    // turn the motor/whatever off
  delay(70);              // the first pause between dots
  digitalWrite(13, HIGH);   // turn the motor/whatever on
  delay(200);              // leave it on to make the second 'dot' of 'S'
  digitalWrite(13, LOW);    // turn the motor/whatever off
  delay(70);                // the second pause between dots
  digitalWrite(13, HIGH);   // turn the motor/whatever on
  delay(200);              // leave it on to make the third 'dot' of 'S'
  digitalWrite(13, LOW);    // turn the motor/whatever off
  delay(2000);              // a 2 second pause between 'SOS's
}