[Solved] Why is it important to call GPIO.setmode() before setting pin modes on a Raspberry Pi? — Ans: It selects the pin numbering system (BCM or BOARD) for all GPIO operations | Raspberry Pi

Raspberry Pi - GPIO Basics with Python

Why is it important to call GPIO.setmode() before setting pin modes on a Raspberry Pi?

AIt disables all pins until setup is complete

BIt selects the pin numbering system (BCM or BOARD) for all GPIO operations

CIt automatically cleans up previous pin settings

DIt initializes the pins to output mode by default

Step-by-Step Solution

Solution:

Step 1: Understand GPIO numbering modes
GPIO.setmode() chooses between BCM (Broadcom chip numbering) or BOARD (physical pin numbering).
Step 2: Importance of setting mode first
All pin references depend on this mode, so it must be set before configuring pins.
Final Answer:
It selects the pin numbering system (BCM or BOARD) for all GPIO operations -> Option B
Quick Check:
setmode defines pin numbering scheme [OK]

Quick Trick: Always call GPIO.setmode before setup [OK]

Common Mistakes:

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Why is it important to call GPIO.setmode() before setting pin modes on a Raspberry Pi?