Arduino Serial Monitor Example

Wiring

Full code

int counter = 0;

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

void loop() {
  Serial.print("Counter: ");
  Serial.println(counter);
  counter++;
  delay(1000);
}

How it works

This lesson matches the page title and gives a clean starting point for this exact example.

Common mistakes

Check board selection, wiring, libraries, power supply and serial monitor baud rate.