Last Updated: 20/07/2021

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Lesson 2 - Hello World

Lessons >> Basics >> Lesson 2 - Hello World

Lesson Contents

Why "Hello World" is important
Structure of a line of code including the semi colon
Functions learnt: Serial.begin(), Serial.print(), Serial,println()
Printing Text, Numbers and Calculations
Reminders and how to version code in a simple way
User of Serial Window
Setting Baud Rate and what it means

Example 1: SerialPrintv1.ino

Click to Download code:SerialPrintv1.ino

Print Hello World to serial monitor

 
/* 16/07/2021
 * SerialPrintv1
 * 
 * Purpose, print Hello World to serial
 * 
 * After completeing lesson alter spelling case of functions to see error
 */


void setup() {
  // Serial.begin(9600) starts serial communication. 9600bps bits per second = 1200 characters per second
  Serial.begin(9600);
  //Send Hello World
  Serial.println("Hello World");


}

void loop() {
  // put your main code here, to run repeatedly:

}

Example 2: SerialPrintv2.ino

Click to Download code:SerialPrintv2.ino

Print Numbers to serial monitor
Learn the difference between numbers as a Variable and numbers as text
print calculations

 
/* 16/07/2021
 * SerialPrintv2
 * 
 * Purpose, tp print numbers
 * 
 * 
 */


void setup() {
  // Serial.begin(9600) starts serial communication. 9600bps bits per second = 1200 characters per second
  Serial.begin(9600);
  //Send script name
  Serial.println("SerialPrintv2...");
  //sends 123 as a text string to serial
  Serial.println("123");
  //sends 123456 as a number 
  Serial.println(123456);
  //send 5+10
  Serial.println(5+10);
  //send 5+10 as text
  Serial.println("5+10");
  //send 5*10
  Serial.println(5*10);


}

void loop() {
  // print in the loop
  Serial.println("Serial Print in loop");
}

Example 3: SerialPrintv3.ino

Click to Download code:SerialPrintv3.ino

The difference between Serial.print() and Serial.println()

 
/* 16/07/2021
   SerialPrintv3

   Purpose, to use function Serial.print does not put a carriage return at the end of the line


*/


void setup() {
  // Serial.begin(9600) starts serial communication. 9600bps bits per second = 1200 characters per second
  Serial.begin(9600);
  //Send script name
  Serial.println("SerialPrintv3...");
  //this will print a blank line
  Serial.println(" ");

  //Serial.print NOT Serial.println
  Serial.print("Val X: ");
  Serial.println(23);
  Serial.print("Val X: ");
  Serial.println(46);


}

void loop() {
  // print in the loop
  //line below has been commented out
  //Serial.println("Serial Print in loop");
}

Example 3: SerialPrintv4.ino

Click to Download code:SerialPrintv4.ino

An example of how variables would be printed out from the loop()

 
/* 16/07/2021
   SerialPrintv3

   Purpose, to use function Serial.print does not put a carriage return at the end of the line


*/


void setup() {
  // Serial.begin(9600) starts serial communication. 9600bps bits per second = 1200 characters per second
  Serial.begin(9600);
  //Send script name
  Serial.println("SerialPrintv3...");
  //this will print a blank line
  Serial.println(" ");

  //Serial.print NOT Serial.println
  Serial.print("Val X: ");
  Serial.println(23);
  Serial.print("Val X: ");
  Serial.println(46);


}

void loop() {
  // print in the loop
  //line below has been commented out
  //Serial.println("Serial Print in loop");
}

Additional Resource Links

Don't forget to use the Reference in you Arduino IDE and look at Serial for more help on this lesson.

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