[Solved] What will be the output if the following code runs?import RPi.GPIO as GPIO GPIO.setmode(GPIO.BCM) GPIO.setup(23, GPIO.OUT) pwm = GPIO.PWM(23, 500) pwm.start(0) pwm.ChangeDutyCycle(50) | Raspberry Pi

Raspberry Pi - PWM Output

What will be the output if the following code runs?

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.OUT)
pwm = GPIO.PWM(23, 500)
pwm.start(0)
pwm.ChangeDutyCycle(50)

ALED brightness changes to 100%

BLED brightness stays at 0%

CCode throws an error on ChangeDutyCycle

DLED brightness changes to 50%

Step-by-Step Solution

Solution:

Step 1: Understand pwm.start(0)
Starting PWM with 0 duty cycle means LED is off initially.
Step 2: Effect of ChangeDutyCycle(50)
ChangeDutyCycle updates brightness to 50%, so LED brightness changes accordingly.
Final Answer:
LED brightness changes to 50% -> Option D
Quick Check:
ChangeDutyCycle updates brightness [OK]

Quick Trick: ChangeDutyCycle adjusts brightness after start [OK]

Common Mistakes:

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