Raspberry Pi - Platform
You want to blink an LED connected to pin 17 on Raspberry Pi using Python. Which code snippet correctly blinks the LED once with a 1-second delay?
You want to blink an LED connected to pin 17 on Raspberry Pi using Python. Which code snippet correctly blinks the LED once with a 1-second delay?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Check pin numbering and setup
BCM mode, import time, GPIO.setup(17, GPIO.OUT) are all correct.Step 2: Verify output and delay
GPIO.output(17, GPIO.HIGH), time.sleep(1), GPIO.output(17, GPIO.LOW) blinks once (on for 1s then off).Step 3: Identify errors in other options
One lacks import time (NameError on sleep); another uses BOARD mode (pin 17 ≠ BCM pin 17 physically); another sets GPIO.IN (should be OUT).Final Answer:
import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) GPIO.setup(17, GPIO.OUT) GPIO.output(17, GPIO.HIGH) time.sleep(1) GPIO.output(17, GPIO.LOW) -> Option DQuick Check:
Use BCM mode, output pin, and time.sleep for blinking [OK]
Quick Trick: Use GPIO.HIGH/LOW with time.sleep for blinking [OK]
Common Mistakes:
- Mixing BOARD and BCM pin numbers
- Setting pin as input instead of output
- Forgetting to import time module
Master "Platform" in Raspberry Pi
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