Blink default LEDs in IoT: Important Code for Exam

Write a program to blink the default light-emitting diode (LED) on the Arduino board with a delay of 2 seconds.

Blink default LEDs in IoT: Program to blink the default light-emitting diode (LED) on the Arduino board with a delay of 2 seconds.

// LED blink default

• This is a comment.
• It’s used to describe the purpose of the code. Comments are ignored by the Arduino compiler.

void setup() { ... }

• This is the setup function, which runs once when the Arduino is powered on or reset.
• It is used to set up initial configurations like pin modes.

pinMode(13, OUTPUT);

• Sets digital pin 13 as an output pin.
• This is necessary because we want to send signals (HIGH/LOW) to the LED.

void loop() { ... }

• This is the main loop of the program. It runs repeatedly forever.
• All blinking logic is placed here.

digitalWrite(13, HIGH);

• Turns ON the LED by sending 5V (HIGH) to pin 13.

delay(2000);

• Pauses the program for 2000 milliseconds = 2 seconds.
• The LED stays ON during this time.

digitalWrite(13, LOW);

• Turns OFF the LED by sending 0V (LOW) to pin 13.

delay(2000);

• Pauses the program for another 2 seconds.
• The LED stays OFF during this time.

What Happens Repeatedly:

1. LED turns ON → wait 2 seconds
2. LED turns OFF → wait 2 seconds
3. Repeats forever

Important HTML Questions for Exam

CODE

//LED blink default
void setup()
{
pinMode(13,OUTPUT);
}
void loop()
{
digitalWrite(13,HIGH);
delay(2000);
digitalWrite(13,LOW);
delay(2000);
}

OUTPUT