🔵 PART 6 — setup() AND loop()

What is void setup() used for?

setup() runs once when the Arduino starts or resets.

It is commonly used to configure pins and initialise components.

What is void loop() used for?

loop() runs continuously/in an infinite loop while the Arduino is operating.

What is the difference between setup() and loop()?

setup() → runs once

loop() → runs repeatedly

Easy memory trick:

SETUP = Set things up once.

LOOP = Keep doing it.

What does this code mean?

void setup() {

pinMode(2, INPUT);

pinMode(13, OUTPUT);

}

When the Arduino starts:

• Pin 2 is configured as an INPUT

• Pin 13 is configured as an OUTPUT

Why does loop() need to run continuously in an interactive system?

So the Arduino can continuously check inputs, process information and respond with outputs.