How To Use Arduino's Analog and Digital Input/Output (I/O) - Projects
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Same pin as output and input - Electrical Engineering Stack Exchange
Input/Output Pins — BBC micro:bit MicroPython 1.1.1 documentation
voltage protection - Are the output pins on the 74HC595 shift register protected against shorting? - Arduino Stack Exchange
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microcontroller - Why does a micro-controller pin use push pull when configured as an output? - Electrical Engineering Stack Exchange
GPIO — General purpose input/output
GPIO — General purpose input/output
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