In this experiment, you will learn how to turn on/off an LED by using an I/O port and a button. The "I/O port" refers to the INPUT and OUTPUT port. Here the INPUT port of the Arduino Uno board is to read the output of an external device. Since the board itself has an LED (connected to Pin 13), you c...By: primerobotics
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from Instructables: exploring http://bit.ly/2BckEGJ
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