Button with interrupt (GPIO.add_event_detect) in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the GPIO library.

Raspberry Pi

import [1]

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Agpiozero

BRPi.GPIO

Ctime

Dos

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'gpiozero' instead of 'RPi.GPIO'.

Forgetting to import the GPIO library.

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.BOARD

BGPIO.IN

CGPIO.BCM

DGPIO.OUT

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.BOARD instead of GPIO.BCM.

Confusing input/output modes with numbering modes.

Using GPIO.BCM sets the pin numbering to Broadcom SOC channel numbers.

3fill in blank

hard

Fix the error in setting up the button pin as input with pull-up resistor.

Raspberry Pi

GPIO.setup(18, [1], pull_up_down=GPIO.PUD_UP)

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AGPIO.PUD_UP

BGPIO.PUD_DOWN

CGPIO.OUT

DGPIO.IN

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the pin as output instead of input.

Confusing pull-up/down with pin mode.

The button pin must be set as GPIO.IN to read input signals.

4fill in blank

hard

Fill both blanks to add an event detect for a falling edge on pin 18 with 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.

Using the wrong callback function name.

The event detect should watch for a falling edge (GPIO.FALLING) and call the button_pressed function.

5fill in blank

hard

Fill all three blanks to define a callback function that prints 'Button pressed!' when called.

Raspberry Pi

def [1](channel):
    print([2])

GPIO.add_event_detect(18, GPIO.FALLING, callback=[3])

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Abutton_pressed

B"Button pressed!"

Dbutton_released

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching function name and callback.

Forgetting quotes around the print message.

The function button_pressed is defined to print the message, and then used as the callback.