Structure

Question 1

This function is used to initialize variables, pin modes, start using libraries, etc. It will also only run once after each power up or reset of the arduino board.

Answer 1

setup()

int buttonPin = 3;

void setup()

{

Serial.begin(9600);

pinMode(buttonPin, INPUT);

}

void loop()

{

// …

}

Question 2

This function is used to actively control the Arduino board. It wraps itself from beginning to end continuously.

Answer 2

loop()

const int buttonPin = 3;

// setup initializes serial and the button pin

void setup()

{

Serial.begin(9600);

pinMode(buttonPin, INPUT);

}

// loop checks the button pin each time,

// and will send serial if it is pressed

void loop()

{

if (digitalRead(buttonPin) == HIGH)

Serial.write(‘H’);

else

Serial.write(‘L’);

delay(1000);

}