Packet Tracer 8.2 - Arduino emulation for IoT programming

Structure

If defined, this function is called once when the program starts.

function setup() {
 pinMode(0, INPUT);
} 

The setup() function is called when a sketch starts. Use it to initialize variables, pin modes, start using libraries, etc. The setup function will only run once, after each powerup or reset of the Arduino board.

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

If defined, this function is called continuously when the program is running. The frequency of the calls depends on the complexity of this function, the number of other devices running programs and their complexity, and the machine's processing power.

  function loop() {
  	Serial.println(digitalRead(0));
  }
 

After creating a setup() function, which initializes and sets the initial values, the loop() function does precisely what its name suggests, and loops consecutively, allowing your program to change and respond. Use it to actively control the Arduino board.

void loop()
{
  if (digitalRead(buttonPin) == HIGH)
    Serial.write('H');
  else
    Serial.write('L');

  delay(1000);
}

Set a digital slot to INPUT or OUTPUT. 

pinMode(1, OUTPUT); 
pinMode(2, INPUT);

Configures the specified pin to behave either as an input or an output.

void setup()
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
}

void loop()
{
  digitalWrite(ledPin, HIGH);   // sets the LED on
  delay(1000);                  // waits for a second
  digitalWrite(ledPin, LOW);    // sets the LED off
  delay(1000);                  // waits for a second
}

 
Reads from a digital slot, returns HIGH or LOW. 

var val = digitalRead(1); 

Reads the value from a specified digital pin, either HIGH or LOW

void loop()
{
  val = digitalRead(inPin);   // read the input pin
  digitalWrite(ledPin, val);    // sets the LED to the button's value
}

Writes to a digital slot with HIGH or LOW.

digitalWrite(1, HIGH);

Write a HIGH or a LOW value to a digital pin.

void loop()
{
  digitalWrite(ledPin, HIGH);   // sets the LED on
  delay(1000);                  // waits for a second
  digitalWrite(ledPin, LOW);    // sets the LED off
  delay(1000);                  // waits for a second
}