Hardware fundamentals: how pull-down and pull-up resistors work
Digital Input Pull-Up Resistor | Arduino Documentation
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Gammon Forum : Electronics : Microprocessors : Switches tutorial
How to Use Digital INPUT and INPUT_PULLUP on Arduino - YouTube
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Pull-up Resistors - SparkFun Learn
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Pull-up / Pull-down resistor
What is Pull Up and Pull Down Resistor and Where to Use them?
Pull-up Resistors - SparkFun Learn
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Can a resistor be connected with ground (I just saw in Arduino circuit), and why? - Quora
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Pull-up and pull-down resistors on Arduino - ElectroSoftCloud
L1: Using buttons - Physical Computing
Pull-up Resistor vs Pull-down - Differences, Arduino Guide - Latest Open Tech From Seeed
Pull-up / Pull-down resistor
arduino - Pull-down resistor ; why is it crucial - Electrical Engineering Stack Exchange
What is Pull Up and Pull Down Resistor and Where to Use them?
