char letter = Serial.read(); //Put a letter or a word
 
 void short() { //Function like dot
 
  
 digitalWrite(LED_BUILTIN, HIGH); 
   
  
 delay(300); 
                       
  
 digitalWrite(LED_BUILTIN, LOW); 
  
  
 delay(300); 
                       

  
 } 
 void long() { //Function like dash
 
   
 digitalWrite(LED_BUILTIN, HIGH); 
   
  
 delay(900); 
                       
  
 digitalWrite(LED_BUILTIN, LOW); 
    
  
 delay(300); 
 
  
 } 
  
 void exec(){ 
 //
 char ex = letter; 

  
for (int i = 0;  i < 5; i = i + 1) { 
 

    
if (ex[i] = 0){ short(); } //Make a loop conversion the letter to code morse 
 
      
else if (ex[i] = 1){long();
 
  
 } 
 } 

int a[] = { 0,1 } ; //Make a list of the code morse of each letter and number
 
int b[] = { 1,0,0,0 } ; 
int c[] = { 1,0,1,0 } ; 
int d[] = { 1,0,0 } ; 
int e[] = { 0 } ; 
int f[] = { 0,0,1,0 } ; 
int g[] = { 1,1,0 } ; 
int h[] = { 0,0,0,0 } ; 
int i[] = { 0,0 } ; 
int j[] = { 0,1,1,1 } ; 
int k[] = { 1,0,1 } ; 
int l[] = { 0,1,0,0 } ; 
int m[] = { 1,1 } ; 
int n[] = { 1,0 } ; 
int o[] = { 1,1,1 } ; 
int p[] = { 0,1,1,0 } ; 
int q[] = { 1,1,0,1 } ; 
int r[] = { 0,1,0 } ; 
int s[] = { 0,0,0 } ; 
int t[] = { 1 } ; 
int u[] = { 0,0,1 } ; 
int v[] = { 0,0,0,1 } ; 
int w[] = { 0,1,1 } ; 
int x[] = { 1,0,0,1 } ; 
int y[] = { 1,0,1,1 } ; 
int z[] = { 1,1,0 } ; 




 void setup() { 

Serial.begin(9600); 
pinMode(LED_BUILTIN, OUTPUT); 

 } 

 void loop() { 

 digitalWrite(LED_BUILTIN, LOW); 
 
exec(); 
 }