Raspberry Pi - GPIO Basics with Python
You want to run a GPIO program that blinks an LED and always cleans up pins on exit, even on errors. Which code snippet correctly achieves this?
You want to run a GPIO program that blinks an LED and always cleans up pins on exit, even on errors. Which code snippet correctly achieves this?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Check for cleanup in finally block
import RPi.GPIO as GPIO GPIO.setmode(GPIO.BCM) try: GPIO.setup(21, GPIO.OUT) for _ in range(5): GPIO.output(21, True) time.sleep(0.5) GPIO.output(21, False) time.sleep(0.5) finally: GPIO.cleanup() calls GPIO.cleanup() in finally, ensuring it runs always.Step 2: Verify blinking logic and error handling
Loop runs 5 times blinking LED; cleanup runs even if error occurs.Final Answer:
Code with try-finally and cleanup in finally -> Option BQuick Check:
try-finally with cleanup = safe GPIO program [OK]
Quick Trick: Use try-finally with cleanup for safe GPIO programs [OK]
Common Mistakes:
- Omitting cleanup in finally
- Using except without finally
- Not handling errors properly
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