To achieve smooth speed control of a DC motor connected to a Raspberry Pi using PWM, which method is most effective?

hard📝 Application Q8 of 15

Raspberry Pi - PWM Output

AVary the PWM duty cycle gradually while keeping frequency constant to simulate analog voltage.

BChange the PWM frequency rapidly while keeping duty cycle fixed at 50%.

CUse digital ON/OFF switching without PWM for precise speed control.

DApply a constant 100% duty cycle and adjust motor speed by mechanical means.

Step-by-Step Solution

Solution:

Step 1: Understand PWM for motor control
Speed depends on average voltage, controlled by duty cycle.
Step 2: Best practice
Gradually changing duty cycle at constant frequency provides smooth speed changes.
Final Answer:
Vary the PWM duty cycle gradually while keeping frequency constant to simulate analog voltage. -> Option A
Quick Check:
Does duty cycle control average voltage? Yes. [OK]

Quick Trick: Smooth speed = gradual duty cycle changes [OK]

Common Mistakes:

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