SOS with variable

In the previous cose we have a SOS with simple instrucctions. We are going to convert simple instructions in to instruuctions with variables. Variables are declared at the begining at the code. Remember that are many types of variables (int, byte, float, bool, double, char...), those variables can be signed or unsigned, global variables are used all along the code and local variables are use only inside a funtion and do no exist outside that specific functiom. In this case, the global variable is t=200, sometimes a variable call be constant in all the code so I can declared const int t=200;. When I declared 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's more effective because I write once and the values changes manny times.

Time variable is sometime t and sometimes 3*t because the rules of the Morse code a dot lasts for one second.

• a dot lasts for one unit of time.
• a dash last for three units of time.
• 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 time.
• the space between different words is seven units of time.

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

The structure of the code is always the same:

1. Comment about the objective of and author of the code
2. Inporting libraries needed for my code, for example if I'm using computer vision I need to import the computer vidsion library in order to use the computer vision instructions
3. Set up function contains the settings of my code: output or imput, screen size...
4. My own functions created by myself to be used in the main code
5. The name code is the loop function and this case contain only simple instructions with variables and do not call any functions created by myself

    
    /*
  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
*/

const int t =200; global variable

//

// 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);
}
//const int T=200;

// 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);                       // 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);                       // 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);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(3*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(3*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(3*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(3*T);                       // wait for a second
   digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(3*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);                       // 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);                       // 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);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(7*T);                       // wait for a second
}