Controlling GPIO through web interface 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] as GPIO

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Agpiozero

Bos

CRPi.GPIO

Dflask

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'gpiozero' instead of 'RPi.GPIO' when using low-level GPIO control.

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

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.BOARD

CGPIO.OUT

DGPIO.IN

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.BOARD when BCM numbering is required.

Confusing pin 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 pin 18 as output.

Raspberry Pi

GPIO.setup(18, [1])

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AGPIO.OUT

BGPIO.IN

CGPIO.PWM

DGPIO.INPUT

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.IN instead of GPIO.OUT for output pins.

Using invalid constants like GPIO.PWM or GPIO.INPUT.

To control an LED or output device, the pin must be set as GPIO.OUT.

4fill in blank

hard

Fill both blanks to create a Flask route that turns the LED on.

Raspberry Pi

from flask import Flask, [1]
app = Flask(__name__)

@app.route('/led/on')
def led_on():
    GPIO.output(18, [2])
    return 'LED is ON'

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Arequest

BGPIO.HIGH

CGPIO.LOW

Drender_template

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.LOW to turn LED on (it turns it off).

Not importing 'request' when needed in Flask.

The Flask request module is commonly imported for routes, and GPIO.HIGH turns the LED on.

5fill in blank

hard

Fill all three blanks to complete the Flask app that controls the LED state based on URL parameter.

Raspberry Pi

from flask import Flask, request
app = Flask(__name__)

@app.route('/led/<state>')
def led_control(state):
    if state == '[1]':
        GPIO.output(18, [2])
    else:
        GPIO.output(18, [3])
    return f'LED turned {state}'

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Aon

BGPIO.HIGH

CGPIO.LOW

Doff

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up 'on' and 'off' strings in the condition.

Using GPIO.LOW to turn LED on.

The URL parameter state is checked for 'on' to set the pin HIGH; otherwise, it sets LOW to turn off the LED.