You have a sensor connected to GPIO23 on the Raspberry Pi. Which code correctly sets up this pin using BCM numbering and reads its input?

hard📝 Application Q9 of 15

Raspberry Pi - GPIO Basics with Python

AGPIO.setmode(GPIO.BCM) GPIO.setup(23, GPIO.IN) value = GPIO.input(23)

BGPIO.setmode(GPIO.BOARD) GPIO.setup(23, GPIO.IN) value = GPIO.input(23)

CGPIO.setmode(GPIO.BCM) GPIO.setup(16, GPIO.IN) value = GPIO.input(16)

DGPIO.setmode(GPIO.BOARD) GPIO.setup(16, GPIO.IN) value = GPIO.input(16)

Step-by-Step Solution

Solution:

Step 1: Use BCM mode for GPIO23
GPIO23 is a BCM pin number, so setmode must be BCM.
Step 2: Setup pin 23 as input and read value
GPIO.setup(23, GPIO.IN) sets pin as input; GPIO.input(23) reads it.
Final Answer:
GPIO.setmode(GPIO.BCM) GPIO.setup(23, GPIO.IN) value = GPIO.input(23) -> Option A
Quick Check:
BCM mode with GPIO23 pin setup and input read [OK]

Quick Trick: Match pin number with mode: BCM uses GPIO numbers [OK]

Common Mistakes:

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