[Solved] What will be the output brightness behavior if this code runs on a Raspberry Pi controlling an LED?import RPi.GPIO as GPIO GPIO.setmode(GPIO.BCM) pin = 18 GPIO.setup(pin, GPIO.OUT) pwm = GPIO.... | Raspberry Pi

Raspberry Pi - PWM Output

What will be the output brightness behavior if this code runs on a Raspberry Pi controlling an LED?

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
pin = 18
GPIO.setup(pin, GPIO.OUT)
pwm = GPIO.PWM(pin, 1000)
pwm.start(25)

ALED will be dim with 25% brightness

BLED will be off

CLED will be fully bright

DCode will cause an error

Step-by-Step Solution

Solution:

Step 1: Analyze PWM start duty cycle
The pwm.start(25) sets duty cycle to 25%, so LED is ON 25% of the time.
Step 2: Relate duty cycle to brightness
25% duty cycle means LED brightness is about 25%, so dim but visible.
Final Answer:
LED will be dim with 25% brightness -> Option A
Quick Check:
Duty cycle 25% = Dim LED [OK]

Quick Trick: Duty cycle % = LED brightness % approximately [OK]

Common Mistakes:

Master "PWM Output" in Raspberry Pi

9 interactive learning modes - each teaches the same concept differently

More Raspberry Pi Quizzes

What will be the output brightness behavior if this code runs on a Raspberry Pi controlling an LED?