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Serial Monitor (Communicating with Arduino) | NexaLearn IoT Lab | NexaLearn

Communication & Debugging15 دقيقة

Serial Monitor (Communicating with Arduino)

How to make Arduino talk to you and send text messages to your computer screen.

Lesson Content

The Serial Monitor is your window into Arduino's mind. Without it, you're flying blind and don't know what the sensors are reading. Serial.begin(9600) initializes the connection at 9600 bits per second. Serial.print() prints text, and Serial.println() prints and moves to a new line. It can be used for debugging.

Components Needed

Arduino Uno

Wiring Notes

Works directly through the USB cable (pins 0 and 1 are used internally for serial communication).

Code Example

int counter = 0;
void setup() {
  Serial.begin(9600);
  Serial.println("Hello, IoT Lab!");
}
void loop() {
  counter++;
  Serial.print("Counter is: ");
  Serial.println(counter);
  delay(1000);
}

Common Mistakes

The Baud Rate at the bottom of the Serial Monitor window doesn't match the number in Serial.begin(), causing strange hieroglyphic characters to appear.

Next Lesson

Distance Sensor (Ultrasonic HC-SR04)