LED toggle with button 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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ARPi.GPIO

Bgpiozero

Ctime

Dsys

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated libraries like 'time' or 'sys' instead of GPIO library.

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

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.BCM

CGPIO.IN

DGPIO.OUT

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.BOARD instead of GPIO.BCM for BCM numbering.

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.OUT

BGPIO.PUD_DOWN

CGPIO.IN

DGPIO.PUD_UP

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the pin as output instead of input.

The button pin must be set as input (GPIO.IN) with pull-up resistor enabled.

4fill in blank

hard

Fill both blanks to toggle the LED state when the button is pressed.

Raspberry Pi

if GPIO.input(18) == [1]:
    led_state = not [2]

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AGPIO.LOW

BGPIO.HIGH

Cled_state

Dbutton_state

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for GPIO.HIGH instead of GPIO.LOW for button press.

Toggling wrong variable.

The button is pressed when input is LOW (due to pull-up). We toggle the current LED state.

5fill in blank

hard

Fill all three blanks to set up the LED pin, initialize its state, and update it.

Raspberry Pi

GPIO.setup([1], GPIO.OUT)
led_state = [2]
GPIO.output([3], led_state)

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A17

BFalse

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong pin number.

Starting LED state as True instead of False.

Pin 17 is used for LED output. Initial state is off (False). We output the state to pin 17.