Raspberry Pi - PWM Output
Which of the following is the correct way to start PWM on pin 18 with a frequency of 1000 Hz using RPi.GPIO?
Which of the following is the correct way to start PWM on pin 18 with a frequency of 1000 Hz using RPi.GPIO?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Check PWM constructor parameters
The PWM constructor takes pin number first, then frequency in Hz, so GPIO.PWM(18, 1000) is correct.Step 2: Verify start method usage
The start method takes duty cycle percentage, so pwm.start(50) starts PWM at 50% duty cycle.Final Answer:
pwm = GPIO.PWM(18, 1000); pwm.start(50) -> Option CQuick Check:
Pin, frequency order + start with duty cycle = A [OK]
Quick Trick: PWM(pin, freq), then start(duty cycle) [OK]
Common Mistakes:
- Swapping frequency and pin arguments
- Passing duty cycle to PWM constructor
- Using start() with frequency instead of duty cycle
Master "PWM Output" in Raspberry Pi
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