Serial Communications and baud rate

Serial communication is a method of transferring data between devices one bit at a time over a single wire or pair of wires.

The baud rate determines the speed of data transmission, and the choice of baud rate depends on the requirements of your application and the capabilities of the devices involved.

Now First we should Initialize serial communication in setup function:

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 bps
}

Println function:

used to print data to the Serial Monitor, followed by a newline character (\n). This function is part of the Serial library, which allows communication with the computer via the USB port.

For example:

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 bps
}

void loop() {
  int sensorValue = analogRead(A0); // Read analog sensor value
  Serial.print("Sensor value: "); // Print text without newline
  Serial.println(sensorValue); // Print sensor value with newline
  delay(2000); // Wait for 2 second
}

Here we have another example:

By default we aren't clicking on button so it button state will be equal to zero and "Button isn't cliking" Will be written otherwise when I click it, the state will be equal to one (clicked)

int pushButton = 2;

void setup() {
  Serial.begin(9600);
  pinMode(pushButton, INPUT);
}

void loop() {
  int buttonState = digitalRead(pushButton);

  if (buttonState == 0) {
    Serial.println("Button isn't cliking");
  } else {
    Serial.println("Button is cliking");
  }


  delay(4000);
}