Digital input (GPIO.input) in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read the state of a GPIO pin.

Raspberry Pi

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN)
state = GPIO.[1](17)
print(state)

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

Ainput

Boutput

Cinput_read

Dread

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.output() instead of GPIO.input()

Trying to read a pin not set as input

The GPIO.input() function reads the digital state of a pin set as input.

2fill in blank

medium

Complete the code to check if the button connected to pin 22 is pressed (assuming active low).

Raspberry Pi

GPIO.setup(22, GPIO.IN, pull_up_down=GPIO.PUD_UP)
if GPIO.[1](22) == GPIO.LOW:
    print("Button pressed")

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

Aoutput

Binput

Cinput_read

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.output() instead of GPIO.input()

Not setting pull-up resistor for active low button

Use GPIO.input() to read the pin state and compare it to GPIO.LOW for active low buttons.

3fill in blank

hard

Fix the error in the code to correctly read a pin state.

Raspberry Pi

GPIO.setup(5, GPIO.IN)
pin_state = GPIO.[1](5)
if pin_state == 1:
    print("Pin is HIGH")

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

Aread

Binput_read

Cinput

Doutput

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.output() or GPIO.read() which do not exist

Confusing pin setup with reading

The correct function to read a pin is GPIO.input(). Other options cause errors.

4fill in blank

hard

Fill both blanks to create a dictionary of pin states for pins 10 and 11.

Raspberry Pi

pins = [10, 11]
states = {pin: GPIO.[1](pin) for pin in pins if GPIO.[2](pin) == GPIO.HIGH}

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

Ainput

Boutput

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.output() to read pin state

Mixing input and output functions

Use GPIO.input() to read pin states. Both blanks require the same function.

5fill in blank

hard

Fill all three blanks to create a dictionary of pin states for pins 7, 8, and 9 where the state is HIGH.

Raspberry Pi

pins = [7, 8, 9]
high_pins = {pin: GPIO.[1](pin) for pin in pins if GPIO.[2](pin) == GPIO.[3]

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

Ainput

CHIGH

DLOW

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.output() instead of GPIO.input()

Comparing to GPIO.LOW instead of GPIO.HIGH

Use GPIO.input() to read pins and compare to GPIO.HIGH to filter pins that are on.