MotionSensor (PIR) 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]

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

Agpiozero

Btime

CRPi.GPIO

Dos

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'gpiozero' instead of 'RPi.GPIO' when the code expects RPi.GPIO syntax.

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

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])

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

AGPIO.BOARD

BGPIO.BCM

CGPIO.OUT

DGPIO.IN

Attempts:

3 left

💡 Hint

Common Mistakes

Using BOARD mode when BCM mode is required.

Confusing input/output constants with mode constants.

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

3fill in blank

hard

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

Raspberry Pi

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

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AGPIO.IN

BGPIO.OUT

CGPIO.PUD_UP

DGPIO.PUD_DOWN

Attempts:

3 left

💡 Hint

Common Mistakes

Setting pin as output instead of input.

Confusing pull-up and pull-down resistor constants.

GPIO pin 17 must be set as input (GPIO.IN) to read the PIR sensor signal.

4fill in blank

hard

Fill both blanks to read the PIR sensor state and print 'Motion detected!' when motion is detected.

Raspberry Pi

if GPIO.[1](17) == [2]:
    print('Motion detected!')

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Ainput

BGPIO.HIGH

CGPIO.LOW

Doutput

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'output' instead of 'input' to read pin state.

Comparing to GPIO.LOW instead of GPIO.HIGH.

Use GPIO.input(17) to read the sensor state and compare it to GPIO.HIGH which means motion detected.

5fill in blank

hard

Fill all three blanks to set up GPIO, read PIR sensor, and clean up GPIO after use.

Raspberry Pi

import RPi.GPIO as GPIO
import [1]

GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

try:
    while True:
        if GPIO.input(17) == GPIO.HIGH:
            print('[2]')
        [3](0.5)
except KeyboardInterrupt:
    GPIO.cleanup()

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

Atime

BMotion detected!

Ctime.sleep

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to import the time module.

Using print as a function call in the blank instead of the message string.

Not calling sleep as a function.

The time module is imported to use time.sleep() for delays. The message 'Motion detected!' is printed when motion is detected.