SOS with variables

In the previous code we have a SOS with simple instructions. We're going to convert simple instructions in to instructions with variables. Variables are declared at the beginind of the code. Remember that are many types od variables (int, byte, float, bool, double, char...), those variables can be signed or unsigned, global variables are used on all along the code, and local variables are used only inside a function and do not exist outside that specific function. In this case the global Variable is t=200, sometimes a Variable can be constant in all the code so I can declared const int t=200;. When I declare a Variable the computer keep a space in the memory for that Variable and keep that name.

What is the advantage of creating Variables? You don't need to repeat all the time at the same value, it is more effective because I write once and the value it changes many times

Time Variable is sometimes t and sometimes 3*t or 7*t because the rules of the Morse code:

• A dot lasts for one unit of time.
• A dash last for three units of times.
• The space between dots and dashes that are part of the same letter is one unit of time.
• The space between different letters is three units of times.
• The space between different words is seven unit of time.

Another possibility is to create 3 variables one is dot, another is dash and the last is space, the code will be: const int dot=200; const int dash=dot*3; const int space=dot*7;

The stucture of the code is always the same:

1. Coment about the objective and author of the code
2. Importing libraries needed for my code, for example if I'm using computer vision I need to import the computer vision library in order to use the compture vision instructions
3. Setup fuction contains the setting of my code: output or input, screen size...
4. My own fuctions created by myself to be used in the main code
5. Tha name code is the loop fuction and in this case contains only simple instructions with Variables and do not call any fuctions created by myself

 
   
  const int t =200; global Variable
  
  void setup() {
   
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {

 // const int t =200; local 
  
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(t);                       // wait for a second

   digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(t);        

   digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(t);        

    delay(3*t);        

digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(t);                       // wait for a second

   digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(t);        

   digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(3*t); 

      delay(3*t);        

 digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(t);                       // wait for a second

   digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(t);        

   digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(t);        

    delay(7*t); 
}