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What is the effect of connecting a pull-down resistor to a Raspberry Pi GPIO input pin?

easy📝 Conceptual Q1 of 15
Raspberry Pi - GPIO Basics with Python
What is the effect of connecting a pull-down resistor to a Raspberry Pi GPIO input pin?
AIt ensures the pin reads LOW when no other input is present
BIt forces the pin to always read HIGH
CIt disables the GPIO pin input
DIt increases the voltage level on the pin
Step-by-Step Solution
Solution:

  1. Step 1: Understand pull-down resistor function

    A pull-down resistor connects the GPIO pin to ground, ensuring a default LOW state.

  2. Step 2: Effect on GPIO input

    When no external signal is applied, the pin reads LOW instead of floating.

  3. Final Answer:

    It ensures the pin reads LOW when no other input is present -> Option A

  4. Quick Check:

    Pull-down resistor pulls input to ground [OK]
Quick Trick: Pull-down resistor sets default LOW state [OK]
Common Mistakes:
  • Confusing pull-down with pull-up resistor function
  • Assuming pull-down forces HIGH instead of LOW
  • Thinking pull-down disables the pin

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