Home automation with relay modules 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]

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ARPi.GPIO

Bgpiozero

Cwiringpi

Dserial

Attempts:

3 left

💡 Hint

Common Mistakes

Using gpiozero instead of RPi.GPIO for low-level pin control.

RPi.GPIO is the standard library to control GPIO pins on Raspberry Pi.

2fill in blank

medium

Complete the code to set GPIO pin 17 as an output.

Raspberry Pi

GPIO.setup([1], GPIO.OUT)

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A18

B22

C27

D17

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing input pins instead of output pins.

Pin 17 is commonly used for relay control and must be set as output.

3fill in blank

hard

Fix the error in the code to turn the relay ON by setting the pin LOW.

Raspberry Pi

GPIO.output(17, [1])

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AGPIO.HIGH

BTrue

CGPIO.LOW

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.HIGH to turn the relay ON, which actually turns it OFF.

For many relay modules, setting the pin LOW activates the relay (turns it ON).

4fill in blank

hard

Complete the code to create a dictionary mapping relay names to their GPIO pins.

Raspberry Pi

relays = {[1]: pin for {{BLANK_3}} in ['relay1', 'relay2', 'relay3']}

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A{

Bpin

Crelay

D}

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect dictionary syntax or variable names.

The dictionary starts with '{' and maps relay names to pin numbers stored in 'pin'.

5fill in blank

hard

Fill all three blanks to turn all relays OFF by setting their pins HIGH.

Raspberry Pi

for pin in relays.values():
    GPIO.output([1], [2])
print([3])

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Apin

BGPIO.HIGH

C"All relays are OFF"

DGPIO.LOW

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.LOW to turn relays OFF, which actually turns them ON.

We loop over each pin, set it HIGH to turn relay OFF, then print a confirmation message.