You want to control a motor speed using PWM on Raspberry Pi. The motor requires a minimum frequency of 500 Hz to run smoothly. Which approach is best to increase speed smoothly?

hard📝 Application Q8 of 15

Raspberry Pi - PWM Output

AIncrease frequency from 100 Hz to 5000 Hz with fixed duty cycle

BKeep frequency at 500 Hz and increase duty cycle gradually

CKeep duty cycle at 100% and vary frequency

DUse frequency below 500 Hz and increase duty cycle

Step-by-Step Solution

Solution:

Step 1: Understand motor frequency requirement
Motor needs at least 500 Hz frequency to run smoothly.
Step 2: Choose how to control speed
Speed is controlled by duty cycle; frequency should stay constant above minimum.
Step 3: Evaluate options
Only Keep frequency at 500 Hz and increase duty cycle gradually keeps frequency at 500 Hz and varies duty cycle smoothly.
Final Answer:
Keep frequency at 500 Hz and increase duty cycle gradually -> Option B
Quick Check:
Frequency fixed, vary duty cycle for speed [OK]

Quick Trick: Fix frequency above minimum, adjust duty cycle for speed [OK]

Common Mistakes:

Varying frequency below minimum
Assuming frequency controls speed directly
Using 100% duty cycle only

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More Raspberry Pi Quizzes

You want to control a motor speed using PWM on Raspberry Pi. The motor requires a minimum frequency of 500 Hz to run smoothly. Which approach is best to increase speed smoothly?

Step 1: Understand motor frequency requirement

Step 2: Choose how to control speed

Step 3: Evaluate options

Final Answer:

Quick Check:

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