Marcus Vechiato

Code Club - Quiz Controlled LEDs with Raspberry Pi

Here's a challenge design for someone learning Python with a Raspberry Pi that incorporates asking questions and controlling LEDs.

image

Objective:

Create a Python-based LED game where players answer questions. Correct answers turn on a green LED, while wrong answers flash a red LED multiple times.

Requirements:

Hardware:

Python Concepts:

Challenge Overview:

Game Rules:

Steps:

1. Setup the LEDs:

Pi 4 Pinout

Raspberry 3b Pinout

Pi 3b Pinout

Raspberry Pi 4 Pinout

Pi 4 Pinout

Raspberry Pi 5 Pinout

Pi 5 Pinout

2. Write the Code:

Create a Python program that:

LED Wiring Test Application

This program will sequentially blink the red LED, green LED to visually confirm that the wiring and components are working correctly.

from gpiozero import LED
import time

# Define LEDs
LED_RED = LED(17)    # Red LED pin
LED_GREEN = LED(18)  # Green LED pin

# Functions
def blink_led(led, interval, blink_times:1):
    """
    Blink a given LED
    :param led: The LED object to blink
    :param interval: sleep in seconds
    :blink_times: how many times the led will blink
    """
    for _ in range(blink_times):
        led.on()
        time.sleep(interval)
        led.off()
        time.sleep(interval)

# Test Wiring
def test_wiring():
    """
    Sequentially test each LED and then both together.
    """
    print("Starting wiring test...")

    # Test Red LED
    print("Testing Red LED...")
    blink_led(LED_RED,0.5,5)
    print("Red LED test complete.")

    # Test Green LED
    print("Testing Green LED...")
    blink_led(LED_GREEN,0.5,5)
    print("Green LED test complete.")

    print("Wiring test complete! If all LEDs blinked as expected, your wiring is correct.")

# Main Program
if __name__ == "__main__":
    try:
        test_wiring()
    except KeyboardInterrupt:
        print("\nTest interrupted.")

$ python wiring_test.py

Starting wiring test...
Testing Red LED...
Red LED test complete.
Testing Green LED...
Green LED test complete.
Testing Both LEDs Together...
Both LEDs test complete.
Wiring test complete! If all LEDs blinked as expected, your wiring is correct.
Cleaning up GPIO...

Example Code (Starter Template)

from gpiozero import LED
import time

LED_GREEN = LED(18)  # Green LED pin
LED_RED = LED(17)    # Red LED pin

# Functions
def indicate_correct():
    """
    Turn on the green LED for 1 second.
    """
    LED_GREEN.on()
    time.sleep(1)
    LED_GREEN.off()

def indicate_wrong():
    """
    Flash the red LED 3 times with 0.5-second intervals.
    """
    # TODO: Write the code to flash the red LED 3 times
    # Hint: Use a loop 

def get_valid_input():
    """
    Repeatedly ask the user for input until a valid answer (A, B, or C) is provided.
    """
    valid_answers = ['A', 'B', 'C']
    while True:
        user_input = input("Your answer (A/B/C): ").strip().upper()
        if user_input in valid_answers:
            return user_input
        else:
            print("Invalid input! Please choose A, B, or C.")

# Questions and answers
questions = [
    # Format: [question, option1, option2, option3, correct_answer]
    ["What is 5 + 3?", "6", "8", "10", "B"],
    ["What is the capital of France?", "Rome", "Paris", "Berlin", "B"],
    ["What is the color of the sky?", "Blue", "Green", "Yellow", "A"],
    ["Which planet is known as the Red Planet?", "Earth", "Mars", "Venus", "B"],
    ["What is the square root of 16?", "2", "4", "8", "B"]
]

# Main Quiz Logic
score = 0 
for q in questions: 

	# Unpack question and options 
	question, option1, option2, option3, correct_answer = q 
	# Display the question and options 
	print(f"{question}")
	print(f"A. {option1}")
	print(f"B. {option2}")
	print(f"C. {option3}") 
	answer = get_valid_input() # Get valid input 
	
	# TODO: Add the logic to check if the answer is correct
	# Compare the user's input with the correct answer
	if ...:  # Complete this condition
		print("Correct!")
		indicate_correct()
		score += 1
	else:
		print(f"Wrong! The correct answer was {correct_answer}.")
		indicate_wrong()

# Final score
print(f"Game over! You scored {score} out of {len(questions)}.")

Tasks:

  1. Complete the wrong_answer() Function:
    • Write a loop to flash the red LED 3 times.
  2. Write the Quiz Logic:
    • Fill in the condition to check if the player's answer matches the correct one.
    • Expect lower or capital letter as input. Treat it accordingly.
  3. Lose Points: Take 1 point if the given answer is not correct.
  4. Enhance the Game (Optional):
    • More questions: Add 3 additional questions
    • Quit: Exit the quiz if the Q letter is entered.
    • Timer: Add a countdown timer for each question to make it more challenging.
    • More questions: Add more questions

Hints to Guide Learners