Raspberry Pi - PWM Output
Which of the following is the correct way to start PWM on GPIO pin 18 with a frequency of 1000 Hz using RPi.GPIO?
Which of the following is the correct way to start PWM on GPIO 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
RPi.GPIO PWM takes pin number first, then frequency in Hz.Step 2: Verify start method usage
start() takes initial duty cycle (0-100), so start(0) is correct for off initially.Final Answer:
pwm = GPIO.PWM(18, 1000); pwm.start(0) -> Option AQuick Check:
GPIO.PWM(pin, freq) then start(duty) [OK]
Quick Trick: PWM(pin, frequency) then start(duty cycle) [OK]
Common Mistakes:
- Swapping frequency and pin
- Starting PWM with frequency instead of duty
- Using zero frequency
Master "PWM Output" in Raspberry Pi
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