Documentation and pin mapping in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the LED pin number.

Arduino

const int ledPin = [1];

Drag options to blanks, or click blank then click option'

AHIGH

BdigitalWrite

CINPUT

D13

Attempts:

3 left

💡 Hint

Common Mistakes

Using a function name instead of a pin number.

Using a constant like HIGH or INPUT instead of a pin number.

The LED is connected to pin 13, so we assign 13 to ledPin.

2fill in blank

medium

Complete the code to set the LED pin as an output in the setup function.

Arduino

void setup() {
  pinMode([1], OUTPUT);
}

Drag options to blanks, or click blank then click option'

AledPin

BINPUT

CdigitalWrite

DHIGH

Attempts:

3 left

💡 Hint

Common Mistakes

Using a constant like INPUT instead of the pin variable.

Using a function name instead of a pin number.

We use ledPin to refer to the pin number and set it as OUTPUT.

3fill in blank

hard

Fix the error in the code to turn the LED on.

Arduino

void loop() {
  digitalWrite([1], HIGH);
}

Drag options to blanks, or click blank then click option'

AledPin

BINPUT

CLOW

DpinMode

Attempts:

3 left

💡 Hint

Common Mistakes

Using INPUT or pinMode instead of the pin variable.

Using LOW instead of HIGH to turn the LED on.

We must use ledPin to specify which pin to set HIGH.

4fill in blank

hard

Fill both blanks to create a comment documenting the LED pin number.

Arduino

// [1] is connected to pin [2]

Drag options to blanks, or click blank then click option'

ALED

Bbutton

C13

D7

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing the LED with the button.

Using the wrong pin number in the comment.

This comment explains that the LED is connected to pin 13.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping pin names to pin numbers.

Arduino

const int pins[] = { [1], [2], [3] };

Drag options to blanks, or click blank then click option'

AledPin

BbuttonPin

C13

D7

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names instead of pin numbers.

Repeating the wrong pin numbers.

The array holds pin numbers 13, 7, and 13 for LED and button pins.