[Solved] Find the bug in this reaction time game code:import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) GPIO.setup(22, GPIO.IN) start = time.time() while GPIO.input(22) == GPIO.LOW: pass end = time.... | Raspberry Pi

Raspberry Pi - LED and Button Projects

Find the bug in this reaction time game code:

import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setup(22, GPIO.IN)
start = time.time()
while GPIO.input(22) == GPIO.LOW:
    pass
end = time.time()
print('Reaction time:', end - start)

AButton press logic reversed; should check for HIGH

BGPIO pin 22 not set as output

CMissing GPIO.cleanup() call

DNo bug; code works correctly

Step-by-Step Solution

Solution:

Step 1: Understand button press logic
Usually, buttons pull GPIO input LOW when pressed if pull-up resistor is used.
Step 2: Check condition in while loop
The loop waits while input is LOW, meaning it waits while button is pressed, which is opposite of expected wait for press.
Final Answer:
Button press logic reversed; should check for HIGH -> Option A
Quick Check:
Button press logic must match GPIO input state [OK]

Quick Trick: Confirm if button press reads LOW or HIGH before coding loop [OK]

Common Mistakes:

Confusing LOW and HIGH states for button press
Not using pull-up/down resistors
Ignoring GPIO cleanup

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Find the bug in this reaction time game code:

Step 1: Understand button press logic

Step 2: Check condition in while loop

Final Answer:

Quick Check:

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