Task 4: Retrieve Data from the Monitor

Hello World! How Are You?

Let's improve our previous sketch to make the output more readable and interactive.

Step 1: Add a Delay

Add int dt = 500; above void setup() to slow things down.

Add delay(dt); after your print line to pause between loops.

Upload and run your sketch. 

// Lesson 1: Hello World!

int dt = 500; // delay time in milliseconds

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.print("Hello World!");
  delay(dt);
}

Step 2: Handling Errors

IDE shows helpful error messages when something goes wrong:

  • Check the message window at the bottom of the IDE.
  • Look for highlighted lines in your code.
  • Check for popups with extra information.
  • If you see expected ';', you likely missed a semicolon.
  • Fix errors and click Verify again.
Arduino IDE interface showing the process of verifying and uploading the sketch to the Arduino UNO MCU. The interface includes buttons for verify (check mark) and upload (arrow), with a clean and technical environment designed for ease of use.

Step 3: Read Input from the Serial Monitor

// Lesson 1: Hello World!

int dt = 500;
String yourName;

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.println("Hello World!");
  Serial.println("What is your name?");
  delay(dt);

  while (Serial.available() == 0) {}

  yourName = Serial.readString();
  Serial.print("Hello ");
  Serial.println(yourName);
  Serial.println("How are you?");
  delay(dt);
}

Time to Experiment

Try changing the dt value, the baud rate, or the printed string to see what happens!