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L1: Using buttons - Physical Computing
Understanding the Pull-up/Pull-down Resistors With Arduino : 6 Steps - Instructables
Pull-up Resistors - SparkFun Learn
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Digital Input Pull-Up Resistor | Arduino Documentation | Arduino Documentation
What is INPUT_PULLUP in Arduino
InputPullupSerial | Arduino Documentation | Arduino Documentation
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Pull-up and pull-down resistors on Arduino - ElectroSoftCloud
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How to Use Digital INPUT and INPUT_PULLUP on Arduino - YouTube
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Pull-up / Pull-down resistor
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