You want to smoothly dim an LED connected to pin 17 from off to full brightness using Software PWM. Which approach correctly achieves this?

hard📝 Application Q15 of 15

Raspberry Pi - PWM Output

ASet duty cycle to 100 immediately and then to 0 after 5 seconds

BUse a loop increasing duty cycle from 0 to 100 with small delays between steps

CChange frequency from 0 to 1000 Hz gradually while keeping duty cycle constant

DCall GPIO.cleanup() repeatedly in a loop while PWM is running

Step-by-Step Solution

Solution:

Step 1: Understand smooth dimming with PWM
Smooth dimming requires gradually changing the duty cycle from 0% (off) to 100% (full brightness).
Step 2: Identify correct method
Using a loop to increase duty cycle with small delays creates a smooth brightness change.
Final Answer:
Use a loop increasing duty cycle from 0 to 100 with small delays between steps -> Option B
Quick Check:
Gradual duty cycle change = smooth dimming [OK]

Quick Trick: Increase duty cycle stepwise with delay for smooth dimming [OK]

Common Mistakes:

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