Why GPIO programming is foundational in Raspberry Pi - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set up a GPIO pin as output.

Raspberry Pi

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup([1], GPIO.OUT)

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Apin

BGPIO

C18

Dinput

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'GPIO' instead of a pin number

Using 'input' instead of a pin number

GPIO pins are identified by numbers like 18. This code sets pin 18 as an output pin.

2fill in blank

medium

Complete the code to turn on an LED connected to a GPIO pin.

Raspberry Pi

GPIO.output(18, [1])

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AGPIO.IN

BGPIO.HIGH

CLOW

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.IN which is for input mode

Using LOW which turns off the LED

Setting the pin to GPIO.HIGH turns the LED on by sending voltage.

3fill in blank

hard

Fix the error in the code to clean up GPIO settings.

Raspberry Pi

GPIO.[1]()

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Acleanup

Bclear

Creset

Dclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'clear' or 'reset' which are not valid GPIO functions

GPIO.cleanup() resets the GPIO pins to a safe state after use.

4fill in blank

hard

Fill both blanks to create a dictionary of pin states for pins 17 and 27.

Raspberry Pi

pin_states = {17: GPIO.[1], 27: GPIO.[2]

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AHIGH

BLOW

CIN

DOUT

Attempts:

3 left

💡 Hint

Common Mistakes

Using IN or OUT which are modes, not states

This dictionary shows pin 17 is HIGH (on) and pin 27 is LOW (off).

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps pin numbers to their output states if the state is HIGH.

Raspberry Pi

active_pins = {pin: state for pin, state in pin_states.items() if state == GPIO.[1] and pin != [2] and pin != [3]

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ALOW

B17

C27

DHIGH

Attempts:

3 left

💡 Hint

Common Mistakes

Using LOW instead of HIGH

Using pin names instead of numbers

This code filters pins that are HIGH and excludes pins 17 and 27.