[Solved] What will be the brightness level of the LED after running this code snippet?import RPi.GPIO as GPIO GPIO.setmode(GPIO.BCM) GPIO.setup(18, GPIO.OUT) pwm = GPIO.PWM(18, 1000) pwm.start(75) | Raspberry Pi

Raspberry Pi - PWM Output

What will be the brightness level of the LED after running this code snippet?

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)
pwm = GPIO.PWM(18, 1000)
pwm.start(75)

ALED will be at 25% brightness

BLED will be off

CLED will be at 75% brightness

DCode will cause a runtime error

Step-by-Step Solution

Solution:

Step 1: Understand pwm.start() parameter
The start method's argument is duty cycle percentage; 75 means 75% on time.
Step 2: Relate duty cycle to brightness
75% duty cycle means LED is on 75% of the time, so brightness is 75%.
Final Answer:
LED will be at 75% brightness -> Option C
Quick Check:
Duty cycle 75% = 75% brightness [OK]

Quick Trick: Duty cycle % equals LED brightness % [OK]

Common Mistakes:

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What will be the brightness level of the LED after running this code snippet?