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Why is it important to use pull-up or pull-down resistors when detecting button presses on Raspberry Pi GPIO pins?

hard📝 Conceptual Q10 of 15
Raspberry Pi - LED and Button Projects
Why is it important to use pull-up or pull-down resistors when detecting button presses on Raspberry Pi GPIO pins?
ATo speed up the button press detection
BTo prevent the GPIO pin from floating and reading random values
CTo increase the current flowing through the button
DTo allow the button to control the Pi's power supply
Step-by-Step Solution
Solution:

  1. Step 1: Understand floating pins

    Without pull-up/down resistors, GPIO pins can float, causing unpredictable readings.

  2. Step 2: Role of pull resistors

    Pull-up/down resistors fix the pin state to HIGH or LOW when button is not pressed, ensuring stable readings.

  3. Final Answer:

    To prevent the GPIO pin from floating and reading random values -> Option B

  4. Quick Check:

    Pull resistors stabilize input readings by preventing floating [OK]
Quick Trick: Pull resistors stop random input noise [OK]
Common Mistakes:
  • Thinking resistors increase current
  • Assuming resistors speed detection
  • Believing buttons control power supply

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