Button class with callbacks in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the GPIO library for Raspberry Pi.

Raspberry Pi

import [1] as GPIO

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

Asys

Bgpiozero

Ctime

DRPi.GPIO

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'gpiozero' instead of 'RPi.GPIO' when the task expects the GPIO library import.

Importing unrelated libraries like 'time' or 'sys'.

The RPi.GPIO library is used to control GPIO pins on Raspberry Pi.

2fill in blank

medium

Complete the code to set the GPIO mode to BCM numbering.

Raspberry Pi

GPIO.setmode([1])

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AGPIO.BCM

BGPIO.OUT

CGPIO.BOARD

DGPIO.IN

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.BOARD instead of GPIO.BCM.

Using GPIO.OUT or GPIO.IN which are for pin direction, not mode.

Setting GPIO mode to GPIO.BCM uses the Broadcom chip pin numbers.

3fill in blank

hard

Fix the error in setting up a GPIO pin 17 as input with a pull-up resistor.

Raspberry Pi

GPIO.setup(17, [1], pull_up_down=GPIO.PUD_UP)

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

AGPIO.OUT

BGPIO.IN

CGPIO.PUD_DOWN

DGPIO.PUD_UP

Attempts:

3 left

💡 Hint

Common Mistakes

Setting pin as GPIO.OUT when using pull-up resistor.

Confusing pull_up_down parameter with pin direction.

Pin 17 should be set as input (GPIO.IN) to use a pull-up resistor.

4fill in blank

hard

Fill both blanks to add an event detection on pin 18 for falling edge and assign a callback function.

Raspberry Pi

GPIO.add_event_detect(18, [1], callback=[2])

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AGPIO.FALLING

BGPIO.RISING

Cbutton_pressed

Dbutton_released

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.RISING instead of GPIO.FALLING for falling edge detection.

Using wrong callback function name.

The event detection is set for falling edge (GPIO.FALLING) and the callback function is button_pressed.

5fill in blank

hard

Fill all three blanks to define a Button class with an __init__ method that sets pin, callback, and configures GPIO input with pull-up.

Raspberry Pi

class Button:
    def __init__(self, pin, callback):
        self.pin = [1]
        self.callback = [2]
        GPIO.setup(self.pin, GPIO.IN, pull_up_down=[3])

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

Apin

Bcallback

CGPIO.PUD_UP

DGPIO.PUD_DOWN

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning wrong variables to self.pin or self.callback.

Using pull-down resistor instead of pull-up.

The __init__ method assigns the pin and callback parameters to instance variables and sets up the pin as input with pull-up resistor.