[Solved] You wrote this code to read a button press on GPIO pin 5: GPIO.setup(5, GPIO.IN) if GPIO.input(5) == 1: print("Button pressed") else:... | Raspberry Pi

Raspberry Pi - GPIO Basics with Python

You wrote this code to read a button press on GPIO pin 5:

GPIO.setup(5, GPIO.IN)
if GPIO.input(5) == 1:
    print("Button pressed")
else:
    print("Button not pressed")

But the output is random even when the button is not pressed. What is the likely problem?

AYou forgot to enable a pull-up or pull-down resistor on pin 5

BYou set the pin mode to output instead of input

CYou used the wrong pin number

DYou need to call GPIO.cleanup() before reading input

Step-by-Step Solution

Solution:

Step 1: Identify cause of random input readings
Without pull-up or pull-down resistors, input pins can float and read random values.
Step 2: Fix by enabling internal resistor
Use GPIO.setup(5, GPIO.IN, pull_up_down=GPIO.PUD_UP) or PUD_DOWN to stabilize input.
Final Answer:
You forgot to enable a pull-up or pull-down resistor on pin 5 -> Option A
Quick Check:
Floating input needs pull resistor = B [OK]

Quick Trick: Always enable pull resistor for input pins reading buttons [OK]

Common Mistakes:

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You wrote this code to read a button press on GPIO pin 5: