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[코딩노트_I/Os] 디지털 입출력
Arduino Digital I/O functions

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[코딩노트_스케치] 스케치 동작원리
How to call the setup function and loop function

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[코딩노트_문자열] String 클래스
Description of the String class for Arduino

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[코딩노트_통신] Serial 라이브러리
Description of the usage of Arduino serial library