Morse Code Communication Using Laser Module (Both)

This is using the laser transmitter and receiver to communicate, and using the Morse code given by the laser transmitter to the receiver.

Jun 5, 2018

•

15174 views

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8 respects

communication

internet of things

games

Components and supplies

Breadboard (generic)

Jumper wires (generic)

Photo resistor

Arduino UNO

LASER TRANSMITTER

Apps and platforms

Arduino IDE

Project description

Code

CODE-1- FOR CONTROLLING THE LASER EMITTER

arduino

1int led13 = 13;      // blink an led on output 13
2
3/*
4  Set the  speed of your morse code
5  Here are the ratios code elements:
6    Dash length  = Dot length x 3
7    Pause between elements = Dot length    
8*/
9int dotLen  = 200;     // length of the morse code 'dot'
10int dashLen = dotLen * 3;    //  length of the morse code 'dash'
11int elemPause = dotLen;// length of the pause  between elements of a character
12int Spaces = dotLen * 3;     // length of the  spaces between characters
13int wordPause = dotLen * 7;  // length of the pause  between words
14
15void setup() {                
16  // initialize the digital  pin as an output for LED lights.
17  pinMode(led13, OUTPUT); 
18}
19
20// Create  a loop of the letters/words you want to output in morse code (defined in string  at top of code)
21void loop()
22{ 
23 
24  // Loop through the string and get  each character one at a time until the end is reached
25  for (int i = 0; i < sizeof(stringToMorseCode)  - 1; i++)
26  {
27    // Get the character in the current position
28  char tmpChar  = stringToMorseCode[i];
29  // Set the case to lower case
30  tmpChar = toLowerCase(tmpChar);
31  // Call the subroutine to get the morse code equivalent for this character
32  GetChar(tmpChar);
33  }
34  
35  // At the end of the string long pause before  looping and starting again
36  LightsOff(8000);      
37}
38
39// DOT
40void  MorseDot()
41{
42  digitalWrite(led13, HIGH);    // turn the LED on 
43  delay(dotLen);              // hold in this position
44}
45
46// DASH
47void MorseDash()
48{
49  digitalWrite(led13, HIGH);    // turn the LED on 
50  delay(dashLen);               //  hold in this position
51}
52
53// Turn Off
54void LightsOff(int delayTime)
55{
56  digitalWrite(led13, LOW);     // turn the LED off   
57  delay(delayTime);             //  hold in this position
58}
59
60// *** Characters to Morse Code Conversion ***  //
61void GetChar(char tmpChar)
62{
63  // Take the passed character and use  a switch case to find the morse code for that character
64  switch (tmpChar) {
65    case 'a': 
66    MorseDot();
67    LightsOff(elemPause);
68    MorseDash();
69    LightsOff(elemPause);
70    break;
71    case 'b':
72    MorseDash();
73    LightsOff(elemPause);
74    MorseDot();
75    LightsOff(elemPause);
76    MorseDot();
77    LightsOff(elemPause);
78    MorseDot();
79    LightsOff(elemPause);
80    break;
81    case 'c':
82      MorseDash();
83    LightsOff(elemPause);
84    MorseDot();
85    LightsOff(elemPause);
86    MorseDash();
87    LightsOff(elemPause);
88    MorseDot();
89    LightsOff(elemPause);
90    break;
91    case 'd':
92    MorseDash();
93    LightsOff(elemPause);
94    MorseDash();
95    LightsOff(elemPause);
96    MorseDot();
97    LightsOff(elemPause);
98    break;
99    case 'e':
100    MorseDot();
101    LightsOff(elemPause);
102    break;
103    case 'f':
104      MorseDot();
105    LightsOff(elemPause);
106    MorseDot();
107    LightsOff(elemPause);
108    MorseDash();
109    LightsOff(elemPause);
110    MorseDot();
111    LightsOff(elemPause);
112    break;
113    case 'g':
114    MorseDash();
115    LightsOff(elemPause);
116    MorseDash();
117    LightsOff(elemPause);
118    MorseDot();
119    LightsOff(elemPause);
120    break;
121    case 'h':
122      MorseDot();
123    LightsOff(elemPause);
124    MorseDot();
125    LightsOff(elemPause);
126    MorseDot();
127    LightsOff(elemPause);
128    MorseDot();
129    LightsOff(elemPause);
130    break;
131    case 'i':
132      MorseDot();
133    LightsOff(elemPause);
134    MorseDot();
135    LightsOff(elemPause);
136    break;
137    case 'j':
138      MorseDot();
139    LightsOff(elemPause);
140    MorseDash();
141    LightsOff(elemPause);
142    MorseDash();
143    LightsOff(elemPause);
144    MorseDash();
145    LightsOff(elemPause);
146    break;
147      case 'k':
148      MorseDash();
149    LightsOff(elemPause);
150    MorseDot();
151    LightsOff(elemPause);
152    MorseDash();
153    LightsOff(elemPause);
154    break;
155    case 'l':
156      MorseDot();
157    LightsOff(elemPause);
158    MorseDash();
159    LightsOff(elemPause);
160    MorseDot();
161    LightsOff(elemPause);
162    MorseDot();
163    LightsOff(elemPause);
164    break;
165      case 'm':
166      MorseDash();
167    LightsOff(elemPause);
168    MorseDash();
169    LightsOff(elemPause);
170    break;
171    case 'n':
172      MorseDash();
173    LightsOff(elemPause);
174    MorseDot();
175    LightsOff(elemPause);
176    break;
177    case 'o':
178      MorseDash();
179    LightsOff(elemPause);
180    MorseDash();
181    LightsOff(elemPause);
182    MorseDash();
183    LightsOff(elemPause);
184    break;
185    case 'p':
186      MorseDot();
187    LightsOff(elemPause);
188    MorseDash();
189    LightsOff(elemPause);
190    MorseDash();
191    LightsOff(elemPause);
192    MorseDot();
193    LightsOff(elemPause);
194    break;
195    case 'q':
196      MorseDash();
197    LightsOff(elemPause);
198    MorseDash();
199    LightsOff(elemPause);
200    MorseDot();
201    LightsOff(elemPause);
202    MorseDash();
203    LightsOff(elemPause);
204    break;
205    case 'r':
206      MorseDot();
207    LightsOff(elemPause);
208    MorseDash();
209    LightsOff(elemPause);
210    MorseDot();
211    LightsOff(elemPause);
212    break;
213    case 's':
214      MorseDot();
215    LightsOff(elemPause);
216    MorseDot();
217    LightsOff(elemPause);
218    MorseDot();
219    LightsOff(elemPause);
220    break;
221    case 't':
222      MorseDash();
223    LightsOff(elemPause);
224    break;
225    case 'u':
226      MorseDot();
227    LightsOff(elemPause);
228    MorseDot();
229    LightsOff(elemPause);
230    MorseDash();
231    LightsOff(elemPause);
232    break;
233    case 'v':
234      MorseDot();
235    LightsOff(elemPause);
236    MorseDot();
237    LightsOff(elemPause);
238    MorseDot();
239    LightsOff(elemPause);
240    MorseDash();
241    LightsOff(elemPause);
242    break;
243    case 'w':
244      MorseDot();
245    LightsOff(elemPause);
246    MorseDash();
247    LightsOff(elemPause);
248    MorseDash();
249    LightsOff(elemPause);
250    break;
251    case 'x':
252      MorseDash();
253    LightsOff(elemPause);
254    MorseDot();
255    LightsOff(elemPause);
256    MorseDot();
257    LightsOff(elemPause);
258    MorseDash();
259    LightsOff(elemPause);
260    break;
261    case 'y':
262      MorseDash();
263    LightsOff(elemPause);
264    MorseDot();
265    LightsOff(elemPause);
266    MorseDash();
267    LightsOff(elemPause);
268    MorseDash();
269    LightsOff(elemPause);
270    break;
271    case 'z':
272      MorseDash();
273    LightsOff(elemPause);
274    MorseDash();
275    LightsOff(elemPause);
276    MorseDot();
277    LightsOff(elemPause);
278    MorseDot();
279    LightsOff(elemPause);
280    break;
281    default: 
282    // If a matching character was not found it will default to  a blank space
283    LightsOff(Spaces);      
284  }
285}
286

int led13 = 13;      // blink an led on output 13

/*
  Set the  speed of your morse code
  Here are the ratios code elements:
    Dash length  = Dot length x 3
    Pause between elements = Dot length    
*/
int dotLen  = 200;     // length of the morse code 'dot'
int dashLen = dotLen * 3;    //  length of the morse code 'dash'
int elemPause = dotLen;// length of the pause  between elements of a character
int Spaces = dotLen * 3;     // length of the  spaces between characters
int wordPause = dotLen * 7;  // length of the pause  between words

void setup() {                
  // initialize the digital  pin as an output for LED lights.
  pinMode(led13, OUTPUT); 
}

// Create  a loop of the letters/words you want to output in morse code (defined in string  at top of code)
void loop()
{ 
 
  // Loop through the string and get  each character one at a time until the end is reached
  for (int i = 0; i < sizeof(stringToMorseCode)  - 1; i++)
  {
    // Get the character in the current position
  char tmpChar  = stringToMorseCode[i];
  // Set the case to lower case
  tmpChar = toLowerCase(tmpChar);
  // Call the subroutine to get the morse code equivalent for this character
  GetChar(tmpChar);
  }
  
  // At the end of the string long pause before  looping and starting again
  LightsOff(8000);      
}

// DOT
void  MorseDot()
{
  digitalWrite(led13, HIGH);    // turn the LED on 
  delay(dotLen);              // hold in this position
}

// DASH
void MorseDash()
{
  digitalWrite(led13, HIGH);    // turn the LED on 
  delay(dashLen);               //  hold in this position
}

// Turn Off
void LightsOff(int delayTime)
{
  digitalWrite(led13, LOW);     // turn the LED off   
  delay(delayTime);             //  hold in this position
}

// *** Characters to Morse Code Conversion ***  //
void GetChar(char tmpChar)
{
  // Take the passed character and use  a switch case to find the morse code for that character
  switch (tmpChar) {
    case 'a': 
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'b':
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'c':
      MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'd':
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'e':
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'f':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'g':
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'h':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'i':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'j':
      MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
      case 'k':
      MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'l':
      MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
      case 'm':
      MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'n':
      MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'o':
      MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'p':
      MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 'q':
      MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'r':
      MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 's':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    case 't':
      MorseDash();
    LightsOff(elemPause);
    break;
    case 'u':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'v':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'w':
      MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'x':
      MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'y':
      MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
    case 'z':
      MorseDash();
    LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
    default: 
    // If a matching character was not found it will default to  a blank space
    LightsOff(Spaces);      
  }
}

CODE-2 - FOR THE RECEIVER END

arduino

1int sensorPin = 0; // select the input pin for ldr
2int sensorValue  = 0; // variable to store the value coming from the sensor
3int a, f; // flags
4void  setup() {
5Serial.begin(9600); //sets serial port for communication
6}
7void  loop() {
8
9sensorValue = analogRead(sensorPin); // read the value from the  sensor
10//Serial.println(sensorValue);
11if(sensorValue>1000)// calculating the  number of dots and dashes
12{
13  for(int i=0;i<=13;i++)
14  {
15    sensorValue=analogRead(sensorPin);
16    if(sensorValue>1000)
17    {
18      a++; //calculating the number of dots  and dashes in the character
19     delay(200);
20    }
21  else
22  {
23    f++;  // calculating the number of spaces in dots and dashes
24   delay(200);
25  }
26  
27  }
28}
29//Serial.print("a= "+a);
30//Serial.println("f= "+f);
31//Serial.println();
32/*
33  * Checking the set of dots, dashes and spaces
34 */
35
36if(a==4 && f==10)
37{
38  Serial.print("a");
39}
40if(a==6 && f==8)
41{
42  Serial.print("b");
43}
44if(a==8  && f==6)
45{
46  Serial.print("c");  
47}
48if(a==1 && f==13)
49{
50  Serial.print("e");
51}
52if(a==2  && f==12)
53{
54  Serial.print("i");
55}
56if(a==10 && f==4)
57{
58  Serial.print("j");
59}
60if(a==7  && f==7)
61{
62  Serial.print("g");
63}
64if(a==9 && f==5)
65{
66  Serial.print("o");
67}
68if(a==3  && f==11)
69{
70  Serial.print("s");
71}
72f=a=0;
73delay(200);
74
75}

int sensorPin = 0; // select the input pin for ldr
int sensorValue  = 0; // variable to store the value coming from the sensor
int a, f; // flags
void  setup() {
Serial.begin(9600); //sets serial port for communication
}
void  loop() {

sensorValue = analogRead(sensorPin); // read the value from the  sensor
//Serial.println(sensorValue);
if(sensorValue>1000)// calculating the  number of dots and dashes
{
  for(int i=0;i<=13;i++)
  {
    sensorValue=analogRead(sensorPin);
    if(sensorValue>1000)
    {
      a++; //calculating the number of dots  and dashes in the character
     delay(200);
    }
  else
  {
    f++;  // calculating the number of spaces in dots and dashes
   delay(200);
  }
  
  }
}
//Serial.print("a= "+a);
//Serial.println("f= "+f);
//Serial.println();
/*
  * Checking the set of dots, dashes and spaces
 */

if(a==4 && f==10)
{
  Serial.print("a");
}
if(a==6 && f==8)
{
  Serial.print("b");
}
if(a==8  && f==6)
{
  Serial.print("c");  
}
if(a==1 && f==13)
{
  Serial.print("e");
}
if(a==2  && f==12)
{
  Serial.print("i");
}
if(a==10 && f==4)
{
  Serial.print("j");
}
if(a==7  && f==7)
{
  Serial.print("g");
}
if(a==9 && f==5)
{
  Serial.print("o");
}
if(a==3  && f==11)
{
  Serial.print("s");
}
f=a=0;
delay(200);

}

CODE-1- FOR CONTROLLING THE LASER EMITTER

arduino

1int led13 = 13;      // blink an led on output 13
2
3/*
4  Set the   speed of your morse code
5  Here are the ratios code elements:
6    Dash length   = Dot length x 3
7    Pause between elements = Dot length    
8*/
9int dotLen   = 200;     // length of the morse code 'dot'
10int dashLen = dotLen * 3;    //   length of the morse code 'dash'
11int elemPause = dotLen;// length of the pause   between elements of a character
12int Spaces = dotLen * 3;     // length of the   spaces between characters
13int wordPause = dotLen * 7;  // length of the pause   between words
14
15void setup() {                
16  // initialize the digital   pin as an output for LED lights.
17  pinMode(led13, OUTPUT); 
18}
19
20// Create   a loop of the letters/words you want to output in morse code (defined in string   at top of code)
21void loop()
22{ 
23 
24  // Loop through the string and get   each character one at a time until the end is reached
25  for (int i = 0; i < sizeof(stringToMorseCode)   - 1; i++)
26  {
27    // Get the character in the current position
28  char tmpChar   = stringToMorseCode[i];
29  // Set the case to lower case
30  tmpChar = toLowerCase(tmpChar);
31   // Call the subroutine to get the morse code equivalent for this character
32   GetChar(tmpChar);
33  }
34  
35  // At the end of the string long pause before   looping and starting again
36  LightsOff(8000);      
37}
38
39// DOT
40void   MorseDot()
41{
42  digitalWrite(led13, HIGH);    // turn the LED on 
43  delay(dotLen);               // hold in this position
44}
45
46// DASH
47void MorseDash()
48{
49   digitalWrite(led13, HIGH);    // turn the LED on 
50  delay(dashLen);               //   hold in this position
51}
52
53// Turn Off
54void LightsOff(int delayTime)
55{
56   digitalWrite(led13, LOW);     // turn the LED off   
57  delay(delayTime);             //   hold in this position
58}
59
60// *** Characters to Morse Code Conversion ***   //
61void GetChar(char tmpChar)
62{
63  // Take the passed character and use   a switch case to find the morse code for that character
64  switch (tmpChar) {
65     case 'a': 
66    MorseDot();
67    LightsOff(elemPause);
68    MorseDash();
69     LightsOff(elemPause);
70    break;
71    case 'b':
72    MorseDash();
73     LightsOff(elemPause);
74    MorseDot();
75    LightsOff(elemPause);
76    MorseDot();
77     LightsOff(elemPause);
78    MorseDot();
79    LightsOff(elemPause);
80    break;
81     case 'c':
82      MorseDash();
83    LightsOff(elemPause);
84    MorseDot();
85     LightsOff(elemPause);
86    MorseDash();
87    LightsOff(elemPause);
88    MorseDot();
89     LightsOff(elemPause);
90    break;
91    case 'd':
92    MorseDash();
93     LightsOff(elemPause);
94    MorseDash();
95    LightsOff(elemPause);
96    MorseDot();
97     LightsOff(elemPause);
98    break;
99    case 'e':
100    MorseDot();
101     LightsOff(elemPause);
102    break;
103    case 'f':
104      MorseDot();
105     LightsOff(elemPause);
106    MorseDot();
107    LightsOff(elemPause);
108    MorseDash();
109     LightsOff(elemPause);
110    MorseDot();
111    LightsOff(elemPause);
112    break;
113     case 'g':
114    MorseDash();
115    LightsOff(elemPause);
116    MorseDash();
117     LightsOff(elemPause);
118    MorseDot();
119    LightsOff(elemPause);
120    break;
121     case 'h':
122      MorseDot();
123    LightsOff(elemPause);
124    MorseDot();
125     LightsOff(elemPause);
126    MorseDot();
127    LightsOff(elemPause);
128    MorseDot();
129     LightsOff(elemPause);
130    break;
131    case 'i':
132      MorseDot();
133     LightsOff(elemPause);
134    MorseDot();
135    LightsOff(elemPause);
136    break;
137     case 'j':
138      MorseDot();
139    LightsOff(elemPause);
140    MorseDash();
141     LightsOff(elemPause);
142    MorseDash();
143    LightsOff(elemPause);
144    MorseDash();
145     LightsOff(elemPause);
146    break;
147      case 'k':
148      MorseDash();
149     LightsOff(elemPause);
150    MorseDot();
151    LightsOff(elemPause);
152    MorseDash();
153     LightsOff(elemPause);
154    break;
155    case 'l':
156      MorseDot();
157     LightsOff(elemPause);
158    MorseDash();
159    LightsOff(elemPause);
160    MorseDot();
161     LightsOff(elemPause);
162    MorseDot();
163    LightsOff(elemPause);
164    break;
165       case 'm':
166      MorseDash();
167    LightsOff(elemPause);
168    MorseDash();
169     LightsOff(elemPause);
170    break;
171    case 'n':
172      MorseDash();
173     LightsOff(elemPause);
174    MorseDot();
175    LightsOff(elemPause);
176    break;
177     case 'o':
178      MorseDash();
179    LightsOff(elemPause);
180    MorseDash();
181     LightsOff(elemPause);
182    MorseDash();
183    LightsOff(elemPause);
184    break;
185     case 'p':
186      MorseDot();
187    LightsOff(elemPause);
188    MorseDash();
189     LightsOff(elemPause);
190    MorseDash();
191    LightsOff(elemPause);
192    MorseDot();
193     LightsOff(elemPause);
194    break;
195    case 'q':
196      MorseDash();
197     LightsOff(elemPause);
198    MorseDash();
199    LightsOff(elemPause);
200    MorseDot();
201     LightsOff(elemPause);
202    MorseDash();
203    LightsOff(elemPause);
204    break;
205     case 'r':
206      MorseDot();
207    LightsOff(elemPause);
208    MorseDash();
209     LightsOff(elemPause);
210    MorseDot();
211    LightsOff(elemPause);
212    break;
213     case 's':
214      MorseDot();
215    LightsOff(elemPause);
216    MorseDot();
217     LightsOff(elemPause);
218    MorseDot();
219    LightsOff(elemPause);
220    break;
221     case 't':
222      MorseDash();
223    LightsOff(elemPause);
224    break;
225     case 'u':
226      MorseDot();
227    LightsOff(elemPause);
228    MorseDot();
229     LightsOff(elemPause);
230    MorseDash();
231    LightsOff(elemPause);
232    break;
233     case 'v':
234      MorseDot();
235    LightsOff(elemPause);
236    MorseDot();
237     LightsOff(elemPause);
238    MorseDot();
239    LightsOff(elemPause);
240    MorseDash();
241     LightsOff(elemPause);
242    break;
243    case 'w':
244      MorseDot();
245     LightsOff(elemPause);
246    MorseDash();
247    LightsOff(elemPause);
248    MorseDash();
249     LightsOff(elemPause);
250    break;
251    case 'x':
252      MorseDash();
253     LightsOff(elemPause);
254    MorseDot();
255    LightsOff(elemPause);
256    MorseDot();
257     LightsOff(elemPause);
258    MorseDash();
259    LightsOff(elemPause);
260    break;
261     case 'y':
262      MorseDash();
263    LightsOff(elemPause);
264    MorseDot();
265     LightsOff(elemPause);
266    MorseDash();
267    LightsOff(elemPause);
268    MorseDash();
269     LightsOff(elemPause);
270    break;
271    case 'z':
272      MorseDash();
273     LightsOff(elemPause);
274    MorseDash();
275    LightsOff(elemPause);
276    MorseDot();
277     LightsOff(elemPause);
278    MorseDot();
279    LightsOff(elemPause);
280    break;
281     default: 
282    // If a matching character was not found it will default to   a blank space
283    LightsOff(Spaces);      
284  }
285}
286

int led13 = 13;      // blink an led on output 13

/*
  Set the   speed of your morse code
  Here are the ratios code elements:
    Dash length   = Dot length x 3
    Pause between elements = Dot length    
*/
int dotLen   = 200;     // length of the morse code 'dot'
int dashLen = dotLen * 3;    //   length of the morse code 'dash'
int elemPause = dotLen;// length of the pause   between elements of a character
int Spaces = dotLen * 3;     // length of the   spaces between characters
int wordPause = dotLen * 7;  // length of the pause   between words

void setup() {                
  // initialize the digital   pin as an output for LED lights.
  pinMode(led13, OUTPUT); 
}

// Create   a loop of the letters/words you want to output in morse code (defined in string   at top of code)
void loop()
{ 
 
  // Loop through the string and get   each character one at a time until the end is reached
  for (int i = 0; i < sizeof(stringToMorseCode)   - 1; i++)
  {
    // Get the character in the current position
  char tmpChar   = stringToMorseCode[i];
  // Set the case to lower case
  tmpChar = toLowerCase(tmpChar);
   // Call the subroutine to get the morse code equivalent for this character
   GetChar(tmpChar);
  }
  
  // At the end of the string long pause before   looping and starting again
  LightsOff(8000);      
}

// DOT
void   MorseDot()
{
  digitalWrite(led13, HIGH);    // turn the LED on 
  delay(dotLen);               // hold in this position
}

// DASH
void MorseDash()
{
   digitalWrite(led13, HIGH);    // turn the LED on 
  delay(dashLen);               //   hold in this position
}

// Turn Off
void LightsOff(int delayTime)
{
   digitalWrite(led13, LOW);     // turn the LED off   
  delay(delayTime);             //   hold in this position
}

// *** Characters to Morse Code Conversion ***   //
void GetChar(char tmpChar)
{
  // Take the passed character and use   a switch case to find the morse code for that character
  switch (tmpChar) {
     case 'a': 
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    break;
    case 'b':
    MorseDash();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
     case 'c':
      MorseDash();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    break;
    case 'd':
    MorseDash();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    break;
    case 'e':
    MorseDot();
     LightsOff(elemPause);
    break;
    case 'f':
      MorseDot();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
     case 'g':
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
     case 'h':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    break;
    case 'i':
      MorseDot();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
     case 'j':
      MorseDot();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    break;
      case 'k':
      MorseDash();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    break;
    case 'l':
      MorseDot();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
       case 'm':
      MorseDash();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    break;
    case 'n':
      MorseDash();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
     case 'o':
      MorseDash();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
     case 'p':
      MorseDot();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    break;
    case 'q':
      MorseDash();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
     case 'r':
      MorseDot();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
     case 's':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
     case 't':
      MorseDash();
    LightsOff(elemPause);
    break;
     case 'u':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
     case 'v':
      MorseDot();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    break;
    case 'w':
      MorseDot();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    break;
    case 'x':
      MorseDash();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    break;
     case 'y':
      MorseDash();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDash();
     LightsOff(elemPause);
    break;
    case 'z':
      MorseDash();
     LightsOff(elemPause);
    MorseDash();
    LightsOff(elemPause);
    MorseDot();
     LightsOff(elemPause);
    MorseDot();
    LightsOff(elemPause);
    break;
     default: 
    // If a matching character was not found it will default to   a blank space
    LightsOff(Spaces);      
  }
}

CODE-2 - FOR THE RECEIVER END

arduino

1int sensorPin = 0; // select the input pin for ldr
2int sensorValue   = 0; // variable to store the value coming from the sensor
3int a, f; // flags
4void   setup() {
5Serial.begin(9600); //sets serial port for communication
6}
7void   loop() {
8
9sensorValue = analogRead(sensorPin); // read the value from the   sensor
10//Serial.println(sensorValue);
11if(sensorValue>1000)// calculating the   number of dots and dashes
12{
13  for(int i=0;i<=13;i++)
14  {
15    sensorValue=analogRead(sensorPin);
16     if(sensorValue>1000)
17    {
18      a++; //calculating the number of dots   and dashes in the character
19     delay(200);
20    }
21  else
22  {
23    f++;   // calculating the number of spaces in dots and dashes
24   delay(200);
25  }
26   
27  }
28}
29//Serial.print("a= "+a);
30//Serial.println("f= "+f);
31//Serial.println();
32/*
33   * Checking the set of dots, dashes and spaces
34 */
35
36if(a==4 && f==10)
37{
38   Serial.print("a");
39}
40if(a==6 && f==8)
41{
42  Serial.print("b");
43}
44if(a==8   && f==6)
45{
46  Serial.print("c");  
47}
48if(a==1 && f==13)
49{
50  Serial.print("e");
51}
52if(a==2   && f==12)
53{
54  Serial.print("i");
55}
56if(a==10 && f==4)
57{
58  Serial.print("j");
59}
60if(a==7   && f==7)
61{
62  Serial.print("g");
63}
64if(a==9 && f==5)
65{
66  Serial.print("o");
67}
68if(a==3   && f==11)
69{
70  Serial.print("s");
71}
72f=a=0;
73delay(200);
74
75}

int sensorPin = 0; // select the input pin for ldr
int sensorValue   = 0; // variable to store the value coming from the sensor
int a, f; // flags
void   setup() {
Serial.begin(9600); //sets serial port for communication
}
void   loop() {

sensorValue = analogRead(sensorPin); // read the value from the   sensor
//Serial.println(sensorValue);
if(sensorValue>1000)// calculating the   number of dots and dashes
{
  for(int i=0;i<=13;i++)
  {
    sensorValue=analogRead(sensorPin);
     if(sensorValue>1000)
    {
      a++; //calculating the number of dots   and dashes in the character
     delay(200);
    }
  else
  {
    f++;   // calculating the number of spaces in dots and dashes
   delay(200);
  }
   
  }
}
//Serial.print("a= "+a);
//Serial.println("f= "+f);
//Serial.println();
/*
   * Checking the set of dots, dashes and spaces
 */

if(a==4 && f==10)
{
   Serial.print("a");
}
if(a==6 && f==8)
{
  Serial.print("b");
}
if(a==8   && f==6)
{
  Serial.print("c");  
}
if(a==1 && f==13)
{
  Serial.print("e");
}
if(a==2   && f==12)
{
  Serial.print("i");
}
if(a==10 && f==4)
{
  Serial.print("j");
}
if(a==7   && f==7)
{
  Serial.print("g");
}
if(a==9 && f==5)
{
  Serial.print("o");
}
if(a==3   && f==11)
{
  Serial.print("s");
}
f=a=0;
delay(200);

}

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