Why project structure matters in Arduino - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the setup function in an Arduino sketch.

Arduino

void [1]() {
  pinMode(13, OUTPUT);
}

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Asetup

Bloop

Cmain

Dinitialize

Attempts:

3 left

💡 Hint

Common Mistakes

Using loop instead of setup here.

The setup() function runs once when the Arduino starts. It is used to set pin modes and initialize settings.

2fill in blank

medium

Complete the code to blink the built-in LED inside the loop function.

Arduino

void loop() {
  digitalWrite(13, [1]);
  delay(1000);
  digitalWrite(13, LOW);
  delay(1000);
}

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AHIGH

BLOW

CINPUT

DOUTPUT

Attempts:

3 left

💡 Hint

Common Mistakes

Using LOW which turns the LED off.

To turn the LED on, you set the pin to HIGH. This sends voltage to the pin.

3fill in blank

hard

Fix the error in the code to correctly read a button state.

Arduino

int buttonState = digitalRead([1]);

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A13

BINPUT

CbuttonPin

DHIGH

Attempts:

3 left

💡 Hint

Common Mistakes

Using HIGH or INPUT instead of the pin variable.

The digitalRead() function needs the pin number variable, not a constant like HIGH or INPUT.

4fill in blank

hard

Fill both blanks to create a dictionary-like structure using arrays for LED pins and their states.

Arduino

int ledPins[] = {2, 3, 4, 5};
int ledStates[] = [1];

void setup() {
  for (int i = 0; i < [2]; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

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ALOW, LOW, LOW, LOW

BHIGH, HIGH, HIGH, HIGH

C4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong array size in loop.

Initializing states to HIGH instead of LOW.

The ledStates array should start with all LEDs off, so all LOW. The loop runs 4 times, matching the number of pins.

5fill in blank

hard

Fill both blanks to create a function that turns on an LED given its pin number and duration.

Arduino

void turnOnLED([1], [2]) {
  digitalWrite(pin, HIGH);
  delay(duration);
  digitalWrite(pin, LOW);
}

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Aint pin

Bint duration

Cduration

Dpin

Attempts:

3 left

💡 Hint

Common Mistakes

Missing parameter types.

Using wrong variable names inside the function.

The function takes two parameters: pin and duration. The code uses these to turn the LED on and off after the delay.