Raspberry Pi - gpiozero Library
You want to control two LEDs connected to pins 17 and 27 using gpiozero. Which code snippet correctly turns on both LEDs for 2 seconds, then turns them off?
You want to control two LEDs connected to pins 17 and 27 using gpiozero. Which code snippet correctly turns on both LEDs for 2 seconds, then turns them off?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze the goal
We want both LEDs on at the same time for 2 seconds, then both off.Step 2: Check each option's sequence
from gpiozero import LED from time import sleep led1 = LED(17) led2 = LED(27) led1.on() led2.on() sleep(2) led1.off() led2.off() turns both LEDs on, waits 2 seconds, then turns both off. from gpiozero import LED from time import sleep led1 = LED(17) led2 = LED(27) led1.on() sleep(2) led2.on() led1.off() led2.off() turns on led1, waits, then led2 on (not simultaneous). from gpiozero import LED from time import sleep led1 = LED(17) led2 = LED(27) led1.off() led2.off() sleep(2) led1.on() led2.on() turns LEDs off first, then on after sleep (wrong order). from gpiozero import LED from time import sleep led1 = LED(17) led2 = LED(27) led1.on() led2.off() sleep(2) led1.off() led2.on() turns one LED on and the other off, then switches after sleep (not both on together).Final Answer:
Code that turns both LEDs on together, waits, then turns both off. -> Option AQuick Check:
Both LEDs on simultaneously for 2 seconds = from gpiozero import LED from time import sleep led1 = LED(17) led2 = LED(27) led1.on() led2.on() sleep(2) led1.off() led2.off() [OK]
Quick Trick: Turn both on before sleep, then off after sleep [OK]
Common Mistakes:
- Turning LEDs on/off at different times
- Switching off before turning on
- Not waiting with both LEDs on
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