Arduinocode

Blink LED

const int ledPin = 13;
const int timeInterval = 100;

void sendDOT()
{
  digitalWrite(ledPin, HIGH); 
  delay(timeInterval);  
  digitalWrite(ledPin, LOW); 
  delay(timeInterval);  
}
void sendDASH()
{
  digitalWrite(ledPin, HIGH); 
  delay(timeInterval * 3);  
  digitalWrite(ledPin, LOW); 
  delay(timeInterval);  
}

void setup() {
  pinMode(ledPin,OUTPUT);
}

void loop(){
 sendDOT();
 sendDASH();

}

Morse example

char* morse[] = {
".-",  // A
"--",  // B
"..-", // C
".-.", // D
"-.-", // F
".--", 
".-..", 
".-.-", 
".--.", 
"-..-", 
};

char word[] = "ABCD";

void setup(){
  Serial.begin(9600);

}

void loop() {
  int wordlen = strlen(word);

  for(int i=0; i<wordlen; i++) { 
    int index = word[i] - 65;
    send_morsecode(index);
  }

}

void send_morsecode(int index) {
   char * morsecode = morse[index];
   int length = strlen(morsecode);

   for(int i=0; i<length; i++) {
     send_bit( morsecode[i] ); 
   }
}

void send_bit(char b) {
 Serial.print(b);

  if(b == '.') {
  digitalWrite(13, HIGH);
  delay(100);
  digitalWrite(13, LOW);
  delay(100);
 } else if( b=='-') {
  digitalWrite(13, HIGH);
  delay(500);
  digitalWrite(13, LOW);
  delay(100);
 }
}

Joost's code

/*
 * Exercise: show "Hackerspace Brussels" in Morse code on the led on pin 13.
 *
 * 
 */

static const char *bhs = "hackerspace brussels";

static const int dotMark = 1;
static const int dashMark = 3;
static const int intraCharGap = 1;
static const int betweenLettersGap = 3;
static const int betweenWordsGap = 7;

static const int wordsPerMinute = 33; // 33;
static const int charsPerMinute = wordsPerMinute * 5;
static const int unitTimeMs = (600*1000)/charsPerMinute;

static const char *codeTable[] = {
  ".-",   // A
  "-...", // B
  "-.-.", // C
  "-..",  // D
  ".",    // E
  "..-.", // F
  "--.",  // G
  "....", // H
  "..",   // I
  ".---", // J
  "-.-",  // K
  ".-..", // L
  "--",   // M
  "-.",   // N
  "---",  // O
  ".--.", // P
  "--.-", // Q
  ".-.",  // R
  "...",  // S
  "-",    // T
  "..-",  // U
  "...-", // V
  ".--",  // W
  "-..-", // X
  "-.--", // Y
  "--..", // Z

};

static const int ledPin = 13;   // LED connected to digital pin 13

void setup()                    // run once, when the sketch starts
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
}

static inline void doGap(int gapSize) {
  digitalWrite(ledPin, LOW);
  delay(unitTimeMs * gapSize);
}

static inline void doMark(int markSize) {
  digitalWrite(ledPin, HIGH);
  delay(unitTimeMs * markSize);
}

static inline void doSpace() {
  doGap(betweenWordsGap);
}

static inline void doChar(char c) {
  c &= (0xFF-0x20); // capitalize
  if (c == 0) {
    doSpace();
    return;
  }
  c -= 'A';
  const char * code = codeTable[c];
  while (*code != 0) {
    if (*code == '-') { doMark(dashMark); }
    else { doMark(dotMark); }
    ++code;
    // make sure we don't set an intraChar gap at the end of the char
    if (*code != 0) {
      doGap(intraCharGap);
    }
  }
  doGap(betweenLettersGap);
}

static inline void doTxt(const char *txt) {
  while(*txt != 0) {
    doChar (*txt);
    ++txt;
  }
  doSpace();
  doSpace();
}

void loop()                     // run over and over again
{
  doTxt(bhs);
}

Joost's version (serial)

/*
 * Exercise: show "Hackerspace Brussels" in Morse code on the led on pin 13.
 * Modification that uses the serial port.
 * 
 */

static const char *bhs = "hackerspace brussels";

static const int dotMark = 1;
static const int dashMark = 3;
static const int intraCharGap = 1;
static const int betweenLettersGap = 3;
static const int betweenWordsGap = 7;

static const int wordsPerMinute = 33; // 33;
static const int charsPerMinute = wordsPerMinute * 5;
static const int unitTimeMs = (1200*1000)/charsPerMinute;

static const char *codeTable[] = {
  ".-",   // A
  "-...", // B
  "-.-.", // C
  "-..",  // D
  ".",    // E
  "..-.", // F
  "--.",  // G
  "....", // H
  "..",   // I
  ".---", // J
  "-.-",  // K
  ".-..", // L
  "--",   // M
  "-.",   // N
  "---",  // O
  ".--.", // P
  "--.-", // Q
  ".-.",  // R
  "...",  // S
  "-",    // T
  "..-",  // U
  "...-", // V
  ".--",  // W
  "-..-", // X
  "-.--", // Y
  "--..", // Z

};

static const int ledPin = 13;   // LED connected to digital pin 13

void setup()                    // run once, when the sketch starts
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
  Serial.begin(9600);
}

static inline void doGap(int gapSize) {
  digitalWrite(ledPin, LOW);
  delay(unitTimeMs * gapSize);
}

static inline void doMark(int markSize) {
  digitalWrite(ledPin, HIGH);
  delay(unitTimeMs * markSize);
}

static inline void doSpace() {
  doGap(betweenWordsGap);
}

static inline void doChar(char c) {
  c &= (0xFF-0x20); // capitalize
  if (c == 0) {
    doSpace();
    return;
  }
  c -= 'A';

  // make sure we ignore non-alpha chars
  if (c > 25) return;

  const char * code = codeTable[c];
  while (*code != 0) {
    if (*code == '-') { doMark(dashMark); }
    else { doMark(dotMark); }
    ++code;
    // make sure we don't set an intraChar gap at the end of the char
    if (*code != 0) {
      doGap(intraCharGap);
    }
  }
  doGap(betweenLettersGap);
}

static inline void doTxt(const char *txt) {
  while(*txt != 0) {
    doChar (*txt);
    ++txt;
  }
  doSpace();
  doSpace();
}

void loop()                     // run over and over again
{
  if (Serial.available()) {
    char c = Serial.read();
    doChar(c);
    Serial.print(c, BYTE);
  }
}

int ledPin = 13;                // LED connected to digital pin 13

void setup()                    // run once, when the sketch starts
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
}

void loop()                     // run over and over again
{
  for(int foobar=0; foobar < 256; foobar++ )
  {
   analogWrite(ledPin, foobar);  
   analogWrite(3, foobar);  
   delay(10);                
  }
 }