[Solved] How would you modify this code to avoid random readings on an input pin 20 connected to a button?GPIO.setup(20, GPIO.IN) print(GPIO.input(20)) | Raspberry Pi

Raspberry Pi - GPIO Basics with Python

How would you modify this code to avoid random readings on an input pin 20 connected to a button?

GPIO.setup(20, GPIO.IN)
print(GPIO.input(20))

AAdd GPIO.output(20, GPIO.LOW) before reading

BSet pin 20 as output instead of input

CUse pull-up or pull-down resistor in setup: GPIO.setup(20, GPIO.IN, pull_up_down=GPIO.PUD_UP)

DCall GPIO.cleanup() before setup

Step-by-Step Solution

Solution:

Step 1: Understand floating input problem
Input pins without pull-up/down resistors can read random values.
Step 2: Use pull-up/down resistor in setup
Adding pull_up_down=GPIO.PUD_UP or GPIO.PUD_DOWN stabilizes input readings.
Final Answer:
Use pull-up or pull-down resistor in setup: GPIO.setup(20, GPIO.IN, pull_up_down=GPIO.PUD_UP) -> Option C
Quick Check:
Pull-up/down resistor stabilizes input pin readings [OK]

Quick Trick: Add pull_up_down parameter to stabilize input [OK]

Common Mistakes:

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How would you modify this code to avoid random readings on an input pin 20 connected to a button?