Software PWM with RPi.GPIO in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the RPi.GPIO library.

Raspberry Pi

import [1] as GPIO

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ARPi.GPIO

Bos

Ctime

Dgpiozero

Attempts:

3 left

💡 Hint

Common Mistakes

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

Forgetting to import the library.

The RPi.GPIO library is imported with import RPi.GPIO as GPIO to control 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.IN

BGPIO.BOARD

CGPIO.OUT

DGPIO.BCM

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.BOARD instead of GPIO.BCM.

Confusing mode constants with pin directions.

Use GPIO.BCM to set the pin numbering to Broadcom SOC channel numbers.

3fill in blank

hard

Fix the error in setting up pin 18 as output.

Raspberry Pi

GPIO.setup(18, [1])

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AGPIO.IN

BGPIO.PWM

CGPIO.OUT

DGPIO.OUTP

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.IN instead of GPIO.OUT.

Using a non-existent mode like GPIO.PWM.

Pin 18 must be set as GPIO.OUT to output signals for PWM.

4fill in blank

hard

Fill both blanks to create a PWM instance on pin 18 with 100Hz frequency.

Raspberry Pi

pwm = GPIO.[1](18, [2])

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APWM

B50

C100

DPin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Pin' instead of 'PWM'.

Setting frequency to 50 instead of 100.

Use GPIO.PWM to create a PWM object and set frequency to 100Hz.

5fill in blank

hard

Fill all three blanks to start PWM with 50% duty cycle and then stop it.

Raspberry Pi

pwm.start([1])
# ... some code ...
pwm.[2]()
GPIO.[3]()

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A50

Bstop

Ccleanup

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' instead of 'stop' to stop PWM.

Forgetting to call GPIO.cleanup().

Start PWM with 50% duty cycle, stop it with stop(), and clean GPIO with cleanup().