Auto-Keyer for Radio "Fox Hunting"

Attach an amateur radio to this and the radio will regularly identify itself so others can use their direction finding skills and locate it.

Jun 14, 2019

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24067 views

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11 respects

amateur radio

ham radio

Devices & Components

Arduino Uno Rev3

Capacitor 100 nF

Capacitor 100 µF

Jumper wires (generic)

Toggle Switch, Toggle

Relay (generic)

External handset/mic plug for your amateur radio

LED (generic)

Hardware & Tools

Solder Wire, Lead Free

Amateur Radio

Soldering iron (generic)

Project description

Code

Fox Hunting Radio Keyer

arduino

The Arduino that keys up the radio to transmit and sends the Morse code to identify itself.

1/*By Nelson Farrier
2  Key up radio and send tone
3  Keys up Baofeng  UV-3R radio by turning on and off the relay, then ID's and and sends a 5 second  tone.
4 */
5      
6// Pin 12 is connected to a relay.
7// Pin 13 is connected  to a tone circuit.
8
9//   modified from: Mike Myers (http://mikemyers.me)  @netnutmike
10//   Let's Make It Episode 6 (http://tech-zen.tv/index.php/shows/let-s-make-it/episodes/59-sensor-fun-with-arduino-1-massive-failure-but-4-successes-let-s-make-it-episode-6)
11//   define the morse code for the alphabet and numbers
12
13char* letters[] = {
14  ".-",     // A
15  "-...",   // B
16  "-.-.",   // C
17  "-..",    //  D
18  ".",      // E
19  "..-.",   // F
20  "--.",    // G
21  "....",   // H
22  "..",     // I
23  ".---",   // J
24  "-.-",    // K
25  ".-..",   // L
26  "--",     // M
27  "-.",     // N
28  "---",    // O
29  ".--.",   // P
30  "--.-",   // Q
31  ".-.",    // R
32  "...",    // S
33  "-",      // T
34  "..-",    // U
35  "...-",   // V
36  ".--",    // W
37  "-..-",   // X
38  "-.--",   // Y
39  "--.."    // Z
40};
41
42char*  numbers[] = {
43  "-----",   // 0
44  ".----",   // 1
45  "..---",   //  2
46  "...--",   // 3
47  "....-",   // 4
48  ".....",   // 5
49  "-....",   // 6
50  "--...",   // 7
51  "---..",   // 8
52  "----."    // 9   ---  end of 1st segment of borrowed code from Mike Myers
53};
54
55int relay = 12;
56int  TonePin = 13; 
57int frequency = 1000; // frequency of tone
58
59int dotDelay  = 70;      // duration of the dot in morse code, this is also the time between the  dots and dashes
60int charDelay = 500;    // duration of the wait between letters  for Farsnworth method
61int wordDelay = 1100;   // duration of the wait between  words for Farsnworth method
62int cycleDelay = 15000;  // HALF the duration because  the largest value is 16383
63
64// the setup routine runs once when you press  reset:
65void setup() {                
66  // initialize the digital pin as an  output.
67  pinMode(12, OUTPUT);     
68  pinMode(13, OUTPUT);     
69  delay(2000);  // initial delay after powering on
70}
71
72// the loop routine runs over and  over again forever:
73void loop() {
74  digitalWrite(relay, HIGH);   // turn the  relay on (HIGH is the voltage level)
75  delay(1000);                 // wait for  a second
76  
77  SendText("NF7Z FOX");  
78
79  delay(1000);                 //  wait for a second
80
81  tone(TonePin, frequency);    // send 7 sec tone
82  delay(7000);
83  noTone(TonePin);
84  
85  delay(10000);                 // 10 seconds transmit  w/o tone
86
87  digitalWrite(relay, LOW);    // turn the relay off by making the  voltage LOW
88
89  delay(cycleDelay);           // wait for cycle time (because  the largest value is 16383)
90  delay(cycleDelay);           // wait for cycle  time
91}
92
93//=================================================================
94//
95//  modified from: Mike Myers (http://mikemyers.me)  @netnutmike
96// Function: morseCodeSequence
97//
98//  Input: Character Array of Dots and Dashes to be sent
99//
100// Description:
101//      This function takes as input an array or "." and "-" and
102//      calls  dotOrDash for each item in the array.
103//
104//      At the end of the sequence,  there is a delay of 3 times 
105//      the dot duration.
106//=================================================================
107
108void  morseCodeSequence(char* sequence)
109{
110   int i = 0;
111
112   // Loop for each  element in the array
113   while (sequence[i] != NULL)  
114   {
115      dotOrDash(sequence[i]);     // Send out the dot or dash
116       i++;                        // Increment  to the next element in the array
117   }
118   delay(charDelay);            // gap  between letters
119}
120//=================================================================
121//
122//  Function: SendText
123//
124// Input: Character Array of text in English
125//
126//  Description:
127//      This function takes text as input and sends Morse code for  each letter.
128//      There then is a pause after each letter.
129//
130//=================================================================
131
132void  SendText(char* MorseCodeLetters)
133{
134   int i = 0;
135   char ch;
136
137   //  Loop for each element in the array
138   while (MorseCodeLetters[i] != NULL)  
139   {
140    ch = MorseCodeLetters[i];
141    // Is it lowercase letter?
142    if  (ch >= 'a' && ch <= 'z')
143    {
144      morseCodeSequence(letters[ch - 'a']);
145    }
146    else if (ch >= 'A' && ch <= 'Z')    // Uppercase Letter
147    {
148      morseCodeSequence(letters[ch - 'A']);
149    }
150    else if (ch >= '0' &&  ch <= '9')    // Number
151    {
152      morseCodeSequence(numbers[ch - '0']);
153    }
154    else if (ch == ' ')                // Space (wait for 4 times dotDelay
155    {
156     delay(wordDelay);      // gap between words  
157    }
158    else  {
159    }
160    i++;         // Increment to the next element in the array
161   }
162   delay(charDelay);            // gap between letters
163}
164
165//=================================================================
166//
167//  Function: dorOrDash
168//
169// modified from: Mike Myers (http://mikemyers.me)  @netnutmike
170// Input: Character that should be either a dot or a dash
171//
172//  Description:
173//      This function first turns on the output then looks to see  
174//      if the character is a "." and if so delays the dotDelay.
175//      
176//      If the character is not a "." then the routine assumes it
177//      is  a "-" and keep the output high for 3 times the length of
178//      dotDelay.  This could be improved by making sure the 
179//      character is a "-" but  for most cases it would not matter.
180//
181//      After the delay time the pin  is taken low turning off the 
182//      tone.
183//
184//      Then it delays for  one dotDelay time so the dots and dashes
185//      do not run together.
186//=================================================================
187
188void  dotOrDash(char dotOrDash)
189{
190  tone(TonePin, frequency);
191  if (dotOrDash  == '.')
192  {
193    delay(dotDelay);           
194  }
195  else // must be a  -
196  {
197    delay(dotDelay * 3);           
198  }
199  noTone(TonePin);
200  delay(dotDelay); // gap between flashes
201}
202

/*By Nelson Farrier
  Key up radio and send tone
  Keys up Baofeng  UV-3R radio by turning on and off the relay, then ID's and and sends a 5 second  tone.
 */
      
// Pin 12 is connected to a relay.
// Pin 13 is connected  to a tone circuit.

//   modified from: Mike Myers (http://mikemyers.me)  @netnutmike
//   Let's Make It Episode 6 (http://tech-zen.tv/index.php/shows/let-s-make-it/episodes/59-sensor-fun-with-arduino-1-massive-failure-but-4-successes-let-s-make-it-episode-6)
//   define the morse code for the alphabet and numbers

char* letters[] = {
  ".-",     // 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
};

char*  numbers[] = {
  "-----",   // 0
  ".----",   // 1
  "..---",   //  2
  "...--",   // 3
  "....-",   // 4
  ".....",   // 5
  "-....",   // 6
  "--...",   // 7
  "---..",   // 8
  "----."    // 9   ---  end of 1st segment of borrowed code from Mike Myers
};

int relay = 12;
int  TonePin = 13; 
int frequency = 1000; // frequency of tone

int dotDelay  = 70;      // duration of the dot in morse code, this is also the time between the  dots and dashes
int charDelay = 500;    // duration of the wait between letters  for Farsnworth method
int wordDelay = 1100;   // duration of the wait between  words for Farsnworth method
int cycleDelay = 15000;  // HALF the duration because  the largest value is 16383

// the setup routine runs once when you press  reset:
void setup() {                
  // initialize the digital pin as an  output.
  pinMode(12, OUTPUT);     
  pinMode(13, OUTPUT);     
  delay(2000);  // initial delay after powering on
}

// the loop routine runs over and  over again forever:
void loop() {
  digitalWrite(relay, HIGH);   // turn the  relay on (HIGH is the voltage level)
  delay(1000);                 // wait for  a second
  
  SendText("NF7Z FOX");  

  delay(1000);                 //  wait for a second

  tone(TonePin, frequency);    // send 7 sec tone
  delay(7000);
  noTone(TonePin);
  
  delay(10000);                 // 10 seconds transmit  w/o tone

  digitalWrite(relay, LOW);    // turn the relay off by making the  voltage LOW

  delay(cycleDelay);           // wait for cycle time (because  the largest value is 16383)
  delay(cycleDelay);           // wait for cycle  time
}

//=================================================================
//
//  modified from: Mike Myers (http://mikemyers.me)  @netnutmike
// Function: morseCodeSequence
//
//  Input: Character Array of Dots and Dashes to be sent
//
// Description:
//      This function takes as input an array or "." and "-" and
//      calls  dotOrDash for each item in the array.
//
//      At the end of the sequence,  there is a delay of 3 times 
//      the dot duration.
//=================================================================

void  morseCodeSequence(char* sequence)
{
   int i = 0;

   // Loop for each  element in the array
   while (sequence[i] != NULL)  
   {
      dotOrDash(sequence[i]);     // Send out the dot or dash
       i++;                        // Increment  to the next element in the array
   }
   delay(charDelay);            // gap  between letters
}
//=================================================================
//
//  Function: SendText
//
// Input: Character Array of text in English
//
//  Description:
//      This function takes text as input and sends Morse code for  each letter.
//      There then is a pause after each letter.
//
//=================================================================

void  SendText(char* MorseCodeLetters)
{
   int i = 0;
   char ch;

   //  Loop for each element in the array
   while (MorseCodeLetters[i] != NULL)  
   {
    ch = MorseCodeLetters[i];
    // Is it lowercase letter?
    if  (ch >= 'a' && ch <= 'z')
    {
      morseCodeSequence(letters[ch - 'a']);
    }
    else if (ch >= 'A' && ch <= 'Z')    // Uppercase Letter
    {
      morseCodeSequence(letters[ch - 'A']);
    }
    else if (ch >= '0' &&  ch <= '9')    // Number
    {
      morseCodeSequence(numbers[ch - '0']);
    }
    else if (ch == ' ')                // Space (wait for 4 times dotDelay
    {
     delay(wordDelay);      // gap between words  
    }
    else  {
    }
    i++;         // Increment to the next element in the array
   }
   delay(charDelay);            // gap between letters
}

//=================================================================
//
//  Function: dorOrDash
//
// modified from: Mike Myers (http://mikemyers.me)  @netnutmike
// Input: Character that should be either a dot or a dash
//
//  Description:
//      This function first turns on the output then looks to see  
//      if the character is a "." and if so delays the dotDelay.
//      
//      If the character is not a "." then the routine assumes it
//      is  a "-" and keep the output high for 3 times the length of
//      dotDelay.  This could be improved by making sure the 
//      character is a "-" but  for most cases it would not matter.
//
//      After the delay time the pin  is taken low turning off the 
//      tone.
//
//      Then it delays for  one dotDelay time so the dots and dashes
//      do not run together.
//=================================================================

void  dotOrDash(char dotOrDash)
{
  tone(TonePin, frequency);
  if (dotOrDash  == '.')
  {
    delay(dotDelay);           
  }
  else // must be a  -
  {
    delay(dotDelay * 3);           
  }
  noTone(TonePin);
  delay(dotDelay); // gap between flashes
}

Fox Hunting Radio Keyer

arduino

The Arduino that keys up the radio to transmit and sends the Morse code to identify itself.

1/*By Nelson Farrier
2  Key up radio and send tone
3  Keys up Baofeng
4  UV-3R radio by turning on and off the relay, then ID's and and sends a 5 second
5  tone.
6 */
7      
8// Pin 12 is connected to a relay.
9// Pin 13 is connected
10  to a tone circuit.
11
12//   modified from: Mike Myers (http://mikemyers.me)  @netnutmike
13//
14   Let's Make It Episode 6 (http://tech-zen.tv/index.php/shows/let-s-make-it/episodes/59-sensor-fun-with-arduino-1-massive-failure-but-4-successes-let-s-make-it-episode-6)
15//
16   define the morse code for the alphabet and numbers
17
18char* letters[] = {
19
20  ".-",     // A
21  "-...",   // B
22  "-.-.",   // C
23  "-..",    //
24  D
25  ".",      // E
26  "..-.",   // F
27  "--.",    // G
28  "....",
29   // H
30  "..",     // I
31  ".---",   // J
32  "-.-",    // K
33  ".-..",
34   // L
35  "--",     // M
36  "-.",     // N
37  "---",    // O
38  ".--.",
39   // P
40  "--.-",   // Q
41  ".-.",    // R
42  "...",    // S
43  "-",
44      // T
45  "..-",    // U
46  "...-",   // V
47  ".--",    // W
48
49  "-..-",   // X
50  "-.--",   // Y
51  "--.."    // Z
52};
53
54char*
55  numbers[] = {
56  "-----",   // 0
57  ".----",   // 1
58  "..---",   //
59  2
60  "...--",   // 3
61  "....-",   // 4
62  ".....",   // 5
63  "-....",
64   // 6
65  "--...",   // 7
66  "---..",   // 8
67  "----."    // 9   ---
68  end of 1st segment of borrowed code from Mike Myers
69};
70
71int relay = 12;
72int
73  TonePin = 13; 
74int frequency = 1000; // frequency of tone
75
76int dotDelay
77  = 70;      // duration of the dot in morse code, this is also the time between the
78  dots and dashes
79int charDelay = 500;    // duration of the wait between letters
80  for Farsnworth method
81int wordDelay = 1100;   // duration of the wait between
82  words for Farsnworth method
83int cycleDelay = 15000;  // HALF the duration because
84  the largest value is 16383
85
86// the setup routine runs once when you press
87  reset:
88void setup() {                
89  // initialize the digital pin as an
90  output.
91  pinMode(12, OUTPUT);     
92  pinMode(13, OUTPUT);     
93  delay(2000);
94  // initial delay after powering on
95}
96
97// the loop routine runs over and
98  over again forever:
99void loop() {
100  digitalWrite(relay, HIGH);   // turn the
101  relay on (HIGH is the voltage level)
102  delay(1000);                 // wait for
103  a second
104  
105  SendText("NF7Z FOX");  
106
107  delay(1000);                 //
108  wait for a second
109
110  tone(TonePin, frequency);    // send 7 sec tone
111  delay(7000);
112
113  noTone(TonePin);
114  
115  delay(10000);                 // 10 seconds transmit
116  w/o tone
117
118  digitalWrite(relay, LOW);    // turn the relay off by making the
119  voltage LOW
120
121  delay(cycleDelay);           // wait for cycle time (because
122  the largest value is 16383)
123  delay(cycleDelay);           // wait for cycle
124  time
125}
126
127//=================================================================
128//
129//
130  modified from: Mike Myers (http://mikemyers.me)  @netnutmike
131// Function: morseCodeSequence
132//
133//
134  Input: Character Array of Dots and Dashes to be sent
135//
136// Description:
137//
138      This function takes as input an array or "." and "-" and
139//      calls
140  dotOrDash for each item in the array.
141//
142//      At the end of the sequence,
143  there is a delay of 3 times 
144//      the dot duration.
145//=================================================================
146
147void
148  morseCodeSequence(char* sequence)
149{
150   int i = 0;
151
152   // Loop for each
153  element in the array
154   while (sequence[i] != NULL)  
155   {
156      dotOrDash(sequence[i]);
157     // Send out the dot or dash
158       i++;                        // Increment
159  to the next element in the array
160   }
161   delay(charDelay);            // gap
162  between letters
163}
164//=================================================================
165//
166//
167  Function: SendText
168//
169// Input: Character Array of text in English
170//
171//
172  Description:
173//      This function takes text as input and sends Morse code for
174  each letter.
175//      There then is a pause after each letter.
176//
177//=================================================================
178
179void
180  SendText(char* MorseCodeLetters)
181{
182   int i = 0;
183   char ch;
184
185   //
186  Loop for each element in the array
187   while (MorseCodeLetters[i] != NULL)  
188
189   {
190    ch = MorseCodeLetters[i];
191    // Is it lowercase letter?
192    if
193  (ch >= 'a' && ch <= 'z')
194    {
195      morseCodeSequence(letters[ch - 'a']);
196
197    }
198    else if (ch >= 'A' && ch <= 'Z')    // Uppercase Letter
199    {
200
201      morseCodeSequence(letters[ch - 'A']);
202    }
203    else if (ch >= '0' &&
204  ch <= '9')    // Number
205    {
206      morseCodeSequence(numbers[ch - '0']);
207
208    }
209    else if (ch == ' ')                // Space (wait for 4 times dotDelay
210
211    {
212     delay(wordDelay);      // gap between words  
213    }
214    else
215  {
216    }
217    i++;         // Increment to the next element in the array
218
219   }
220   delay(charDelay);            // gap between letters
221}
222
223//=================================================================
224//
225//
226  Function: dorOrDash
227//
228// modified from: Mike Myers (http://mikemyers.me)
229  @netnutmike
230// Input: Character that should be either a dot or a dash
231//
232//
233  Description:
234//      This function first turns on the output then looks to see
235  
236//      if the character is a "." and if so delays the dotDelay.
237//      
238//
239      If the character is not a "." then the routine assumes it
240//      is
241  a "-" and keep the output high for 3 times the length of
242//      dotDelay.
243  This could be improved by making sure the 
244//      character is a "-" but
245  for most cases it would not matter.
246//
247//      After the delay time the pin
248  is taken low turning off the 
249//      tone.
250//
251//      Then it delays for
252  one dotDelay time so the dots and dashes
253//      do not run together.
254//=================================================================
255
256void
257  dotOrDash(char dotOrDash)
258{
259  tone(TonePin, frequency);
260  if (dotOrDash
261  == '.')
262  {
263    delay(dotDelay);           
264  }
265  else // must be a
266  -
267  {
268    delay(dotDelay * 3);           
269  }
270  noTone(TonePin);
271
272  delay(dotDelay); // gap between flashes
273}
274

/*By Nelson Farrier
  Key up radio and send tone
  Keys up Baofeng
  UV-3R radio by turning on and off the relay, then ID's and and sends a 5 second
  tone.
 */
      
// Pin 12 is connected to a relay.
// Pin 13 is connected
  to a tone circuit.

//   modified from: Mike Myers (http://mikemyers.me)  @netnutmike
//
   Let's Make It Episode 6 (http://tech-zen.tv/index.php/shows/let-s-make-it/episodes/59-sensor-fun-with-arduino-1-massive-failure-but-4-successes-let-s-make-it-episode-6)
//
   define the morse code for the alphabet and numbers

char* letters[] = {

  ".-",     // 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
};

char*
  numbers[] = {
  "-----",   // 0
  ".----",   // 1
  "..---",   //
  2
  "...--",   // 3
  "....-",   // 4
  ".....",   // 5
  "-....",
   // 6
  "--...",   // 7
  "---..",   // 8
  "----."    // 9   ---
  end of 1st segment of borrowed code from Mike Myers
};

int relay = 12;
int
  TonePin = 13; 
int frequency = 1000; // frequency of tone

int dotDelay
  = 70;      // duration of the dot in morse code, this is also the time between the
  dots and dashes
int charDelay = 500;    // duration of the wait between letters
  for Farsnworth method
int wordDelay = 1100;   // duration of the wait between
  words for Farsnworth method
int cycleDelay = 15000;  // HALF the duration because
  the largest value is 16383

// the setup routine runs once when you press
  reset:
void setup() {                
  // initialize the digital pin as an
  output.
  pinMode(12, OUTPUT);     
  pinMode(13, OUTPUT);     
  delay(2000);
  // initial delay after powering on
}

// the loop routine runs over and
  over again forever:
void loop() {
  digitalWrite(relay, HIGH);   // turn the
  relay on (HIGH is the voltage level)
  delay(1000);                 // wait for
  a second
  
  SendText("NF7Z FOX");  

  delay(1000);                 //
  wait for a second

  tone(TonePin, frequency);    // send 7 sec tone
  delay(7000);

  noTone(TonePin);
  
  delay(10000);                 // 10 seconds transmit
  w/o tone

  digitalWrite(relay, LOW);    // turn the relay off by making the
  voltage LOW

  delay(cycleDelay);           // wait for cycle time (because
  the largest value is 16383)
  delay(cycleDelay);           // wait for cycle
  time
}

//=================================================================
//
//
  modified from: Mike Myers (http://mikemyers.me)  @netnutmike
// Function: morseCodeSequence
//
//
  Input: Character Array of Dots and Dashes to be sent
//
// Description:
//
      This function takes as input an array or "." and "-" and
//      calls
  dotOrDash for each item in the array.
//
//      At the end of the sequence,
  there is a delay of 3 times 
//      the dot duration.
//=================================================================

void
  morseCodeSequence(char* sequence)
{
   int i = 0;

   // Loop for each
  element in the array
   while (sequence[i] != NULL)  
   {
      dotOrDash(sequence[i]);
     // Send out the dot or dash
       i++;                        // Increment
  to the next element in the array
   }
   delay(charDelay);            // gap
  between letters
}
//=================================================================
//
//
  Function: SendText
//
// Input: Character Array of text in English
//
//
  Description:
//      This function takes text as input and sends Morse code for
  each letter.
//      There then is a pause after each letter.
//
//=================================================================

void
  SendText(char* MorseCodeLetters)
{
   int i = 0;
   char ch;

   //
  Loop for each element in the array
   while (MorseCodeLetters[i] != NULL)  

   {
    ch = MorseCodeLetters[i];
    // Is it lowercase letter?
    if
  (ch >= 'a' && ch <= 'z')
    {
      morseCodeSequence(letters[ch - 'a']);

    }
    else if (ch >= 'A' && ch <= 'Z')    // Uppercase Letter
    {

      morseCodeSequence(letters[ch - 'A']);
    }
    else if (ch >= '0' &&
  ch <= '9')    // Number
    {
      morseCodeSequence(numbers[ch - '0']);

    }
    else if (ch == ' ')                // Space (wait for 4 times dotDelay

    {
     delay(wordDelay);      // gap between words  
    }
    else
  {
    }
    i++;         // Increment to the next element in the array

   }
   delay(charDelay);            // gap between letters
}

//=================================================================
//
//
  Function: dorOrDash
//
// modified from: Mike Myers (http://mikemyers.me)
  @netnutmike
// Input: Character that should be either a dot or a dash
//
//
  Description:
//      This function first turns on the output then looks to see
  
//      if the character is a "." and if so delays the dotDelay.
//      
//
      If the character is not a "." then the routine assumes it
//      is
  a "-" and keep the output high for 3 times the length of
//      dotDelay.
  This could be improved by making sure the 
//      character is a "-" but
  for most cases it would not matter.
//
//      After the delay time the pin
  is taken low turning off the 
//      tone.
//
//      Then it delays for
  one dotDelay time so the dots and dashes
//      do not run together.
//=================================================================

void
  dotOrDash(char dotOrDash)
{
  tone(TonePin, frequency);
  if (dotOrDash
  == '.')
  {
    delay(dotDelay);           
  }
  else // must be a
  -
  {
    delay(dotDelay * 3);           
  }
  noTone(TonePin);

  delay(dotDelay); // gap between flashes
}

Downloadable files

Schematic for the fox hunt radio's keyer

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nfarrier

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