SOS wtih variables

In the prevous code we have a SOS with simple instructions.We are going to convert a simple instructions into instructions with variables.Variables are declared at the beggining of the code. Remember that are many types of variables (int, byte, float, bool, double, char,...), those variables can bee signed or unsigned, global variebles are used all onalong code, and llocal variables are used onlly inside a function, and do not exist outside that specific function. In this case the global variable is t =200; some times a variable can bee constant in all the cod, so I can declare const int t=200;. When I declare a variable the computer give a space in the memmory for that variable and keep that name.

What is the ventatge of creating a varible?: You don't have to repaet all the time the same value. It is moore effective because I write once the value, and the value changes many times.

Time variable is some times "t" and sometimes "3*t" or for 7*t because the roles of the Morse code:

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

Another possibility si to create trhee variables, one is dot, another 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 structure of code is always the same:

1. Comment about the objetive o the code and author of the code
2. Inporting libreries needed for my code, for example: if I am using computer vision I need to import the computer vision librery in order to use he computer vision instructions.
3. setup function contains the settings(configuración) of my code: output or input, sceen size...
4. My own functions created by myself to be used in the main code.
5. The name code is the loop function and in this case contain only simple instructions with variables and do not call any function created by my self.

const int t = 200 ; global variable

/*
  Blink


  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://www.arduino.cc/en/Main/Products

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
*/


// the setup function runs once when you press reset or power the board
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() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);   
    digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(t);    
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);    
     digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(t);
      digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(t);
      digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);
    digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);   
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);   
    digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(3*t); 
      digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);   
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);   
    digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);   
    digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(3*t);  
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t); 
    digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(t);   
    digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);    
    digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(t);    
     digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(t);
      digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(t);
      digitalWrite(LED_BUILTIN, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(7*t);


}