PWMLED for brightness in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the PWMLED class from gpiozero.

Raspberry Pi

from gpiozero import [1]

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

ALED

BPWMLED

CButton

DOutputDevice

Attempts:

3 left

💡 Hint

Common Mistakes

Importing LED instead of PWMLED

Importing Button which is unrelated

Importing OutputDevice which is too general

We import PWMLED to control LED brightness using pulse-width modulation.

2fill in blank

medium

Complete the code to create a PWMLED object on GPIO pin 17.

Raspberry Pi

led = PWMLED([1])

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

A18

B27

C22

D17

Attempts:

3 left

💡 Hint

Common Mistakes

Using pin 18 or 22 which are valid pins but not the one asked

Using pin 27 which is higher than 22

GPIO pin 17 is used to connect the LED for brightness control.

3fill in blank

hard

Fix the error in setting the LED brightness to 50%.

Raspberry Pi

led.value = [1]

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

A0.5

B50

C1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 50 which is out of range

Using 5 which is too high

Using 1 which is full brightness

The brightness value must be between 0.0 (off) and 1.0 (full brightness). 50% brightness is 0.5.

4fill in blank

hard

Fill both blanks to create a dictionary of LED brightness for words longer than 3 letters.

Raspberry Pi

brightness = {word: [1] for word in words if len(word) [2] 3}

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Alen(word)

B>

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' or '==' which filter wrong words

Using word instead of len(word) for brightness

We use len(word) to get brightness and filter words longer than 3 with >.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping uppercase words to brightness values greater than 0.3.

Raspberry Pi

brightness = [1]: [2] for word in words if [2] [3] 0.3}

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Aword.upper()

Bword

C>

Dlen(word)

Attempts:

3 left

💡 Hint

Common Mistakes

Using word as the value instead of len(word)

Using '<' instead of '>' in filter

Using word instead of word.upper() as key

Keys are uppercase words (word.upper()), values are brightness (len(word)), filtered by brightness > 0.3.