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Why Is Arduino Pin 0 And 1 Always High?
Pins 0 and 1 are used for serial communications and it’s normal for them both to be a steady high when there is no actual data being sent, that is the default stop condition for serial data.
Understanding HIGH and LOW Arduino Pin States :: Open Source Hardware Group Arduino Tutorials
Overview If you are just getting started with
Arduino Uno - Pins Overview
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Understanding Arduino Interrupts | Hardware, Pin Change & Timer Interrupts
Learn to use Hardware,
