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L1: Using buttons - Physical Computing
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Understanding the Pull-up/Pull-down Resistors With Arduino : 6 Steps - Instructables
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Arduino INPUT_PULLUP Explained (pinMode) - The Robotics Back-End
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Pull-up and pull-down resistors on Arduino - ElectroSoftCloud
3 Different way of connecting a push button to Arduino » DIY Usthad
Understanding the Pull-up/Pull-down Resistors With Arduino : 6 Steps - Instructables
Arduino Pull-up Pull-down Resistor | Arduino FAQs
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