[Solved] Why is it important to call GPIO.setmode() before setting up pins in RPi.GPIO? — Ans: Because it defines the pin numbering system to avoid confusion | Raspberry Pi

Raspberry Pi - GPIO Basics with Python

Why is it important to call GPIO.setmode() before setting up pins in RPi.GPIO?

ABecause it initializes the GPIO pins to output mode by default

BBecause it defines the pin numbering system to avoid confusion

CBecause it disables warnings from previous runs

DBecause it automatically calls GPIO.cleanup()

Step-by-Step Solution

Solution:

Step 1: Understand the role of GPIO.setmode()
This function sets the numbering system (BOARD or BCM) so the program knows how to interpret pin numbers.
Step 2: Evaluate other options
It does not initialize pins to output, disable warnings, or call cleanup automatically.
Final Answer:
Because it defines the pin numbering system to avoid confusion -> Option B
Quick Check:
setmode defines numbering system = B [OK]

Quick Trick: Always set pin numbering mode first with GPIO.setmode() [OK]

Common Mistakes:

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Why is it important to call GPIO.setmode() before setting up pins in RPi.GPIO?