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Pull-up Resistors - SparkFun Learn
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Pull-up resistor - Wikipedia
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InputPullupSerial | Arduino Documentation | Arduino Documentation
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What are Pull-Up or Pull-Down Resistors?
Digital Input Pull-Up Resistor | Arduino Documentation | Arduino Documentation
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Arduino Uno Example Sketch: Digital Input Pullup - Arduino - Engineering and Component Solution Forum - TechForum │ Digi-Key
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