Raspberry Pi - PWM Output
You want to smoothly increase LED brightness from 0% to 100% over 5 seconds using PWM on pin 18. Which code snippet correctly implements this?
You want to smoothly increase LED brightness from 0% to 100% over 5 seconds using PWM on pin 18. Which code snippet correctly implements this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate total steps and delay
To increase from 0 to 100 in 5 seconds smoothly, small steps with short delay are needed.Step 2: Analyze each option timing
import time for dc in range(0, 101): pwm.ChangeDutyCycle(dc) time.sleep(0.05) uses 101 steps with 0.05s delay = 5.05s total, smooth increase.Final Answer:
import time for dc in range(0, 101): pwm.ChangeDutyCycle(dc) time.sleep(0.05) -> Option AQuick Check:
101 steps * 0.05s = ~5 seconds smooth ramp [OK]
Quick Trick: Use small steps with short delay for smooth brightness [OK]
Common Mistakes:
- Using too few steps causing jumps
- Incorrect total time calculation
- Multiplying duty cycle incorrectly
Master "PWM Output" in Raspberry Pi
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