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Embedded Systems & IoT
Q34 / 100
What is the purpose of "pull-up" and "pull-down" resistors in digital circuits?
Correct! Well done.
Incorrect.
The correct answer is A) To ensure a digital input pin has a defined logic level (high or low) when not actively driven, preventing unpredictable "floating" states
A
Correct Answer
To ensure a digital input pin has a defined logic level (high or low) when not actively driven, preventing unpredictable "floating" states
Explanation
Without a pull-up or pull-down resistor, an unconnected ("floating") digital input can read random noise as high or low; these resistors bias the pin to a known default state when not actively driven by another source.
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