RGB LED color mixing in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the red LED pin as an output.

Raspberry Pi

import RPi.GPIO as GPIO

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

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A18

B17

C22

D27

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong GPIO pin number.

Forgetting to set the pin as output.

The red LED is connected to GPIO pin 17, so we set it as output using GPIO.setup(17, GPIO.OUT).

2fill in blank

medium

Complete the code to turn on the green LED.

Raspberry Pi

GPIO.output([1], GPIO.HIGH)

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A17

B27

C22

D18

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.LOW instead of GPIO.HIGH.

Using the wrong pin number.

The green LED is connected to GPIO pin 22, so turning it on requires GPIO.output(22, GPIO.HIGH).

3fill in blank

hard

Fix the error in the code to turn off the blue LED.

Raspberry Pi

GPIO.output([1], GPIO.LOW)

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A18

B27

C22

D17

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong pin number for the blue LED.

Using GPIO.HIGH instead of GPIO.LOW.

The blue LED is connected to GPIO pin 18, so to turn it off use GPIO.output(18, GPIO.LOW).

4fill in blank

hard

Fill both blanks to create a dictionary mapping colors to their GPIO pins.

Raspberry Pi

led_pins = [1]: 17, [2]: 22, 'blue': 18}

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A'red'

B'yellow'

C'green'

D'white'

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect color names as keys.

Forgetting quotes around string keys.

The dictionary keys for the red and green LEDs are 'red' and 'green' respectively, matching their GPIO pins.

5fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps colors to their pin states when turned on.

Raspberry Pi

led_states = [2]: GPIO.HIGH for [2], {{BLANK_4}} in led_pins.items()

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A{

Bcolor

Cpin

D[

Attempts:

3 left

💡 Hint

Common Mistakes

Using square brackets instead of curly braces.

Mixing up variable names in the loop.

The dictionary comprehension starts with '{', iterates over color and pin in led_pins.items(), and sets each color's state to GPIO.HIGH.