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Pull-down resistor on digital IO pin used as output = LOW level on this pin during power-up, restart,...? - General Electronics - Arduino Forum
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Pull-up Resistors and Pull-down Resistors Explained
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L1: Using buttons - Physical Computing
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Dart Arduino Midi Dmx Controller
InputPullupSerial
Push Button with Arduino | Pull up & Pull down resistor | Led Control using Button - YouTube
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