Traffic light simulation 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] as GPIO

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Agpiozero

Bsys

Ctime

DRPi.GPIO

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'time' instead of the GPIO library.

Using 'gpiozero' which is a different GPIO library.

The RPi.GPIO library is used to control the GPIO pins on a Raspberry Pi for hardware projects like traffic lights.

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.OUT

BGPIO.BCM

CGPIO.BOARD

DGPIO.IN

Attempts:

3 left

💡 Hint

Common Mistakes

Using GPIO.BOARD which refers to physical pin numbers.

Using GPIO.OUT which is for pin direction, not mode.

Setting GPIO mode to GPIO.BCM means we use the Broadcom chip's pin numbering.

3fill in blank

hard

Fix the error in setting up pin 17 as an output.

Raspberry Pi

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

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A17

B18

CGPIO.OUT

DGPIO.IN

Attempts:

3 left

💡 Hint

Common Mistakes

Using pin 18 instead of 17.

Using GPIO.OUT as pin number.

Pin 17 is the correct GPIO pin number to set as output for the traffic light LED.

4fill in blank

hard

Fill both blanks to turn on the green LED connected to pin 22.

Raspberry Pi

GPIO.output([1], [2])

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A22

BGPIO.HIGH

CGPIO.LOW

D17

Attempts:

3 left

💡 Hint

Common Mistakes

Using pin 17 instead of 22.

Setting output to GPIO.LOW which turns the LED off.

Pin 22 controls the green LED. Setting output to GPIO.HIGH turns it on.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping LED colors to their GPIO pins.

Raspberry Pi

led_pins = { [1]: [2], [3]: 22 }

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A'red'

B17

C'green'

D'yellow'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'yellow' instead of 'green' as a key.

Mixing up pin numbers.

The dictionary maps 'red' to pin 17 and 'green' to pin 22 for the traffic lights.