The setup() and loop() Functions in Arduino Programming

As we have seen in Basic Structure for Arduino that there are 2 basic functions in an Arduino Program.

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setup()

The setup() function is called once when your program starts. Use it to initialize pin modes, or begin serial. It must be included in a program even if there are no statements to run.

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

 loop()

After calling the setup() function, the loop() function does precisely what its name suggests, and loops consecutively, allowing the program to change, respond, and control the Arduino board.

void loop()
{
digitalWrite(pin, HIGH);   // turns ‘pin’ on
delay(1000);               // pauses for one second
digitalWrite(pin, LOW);    // turns ‘pin’ off
delay(1000);               // pauses for one second
}

By using these 2 functions you can create any Arduino Program.

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