clavier matriciel avec arduino mini

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je suis  entrain de réaliser un clavier matriciel 3*3 avec arduino mini.
je trouve des problémes dans la réalisation car j'utilise 9 led chaqu'une correspond à un bouton du clavier de façon quand j'appuie sur un bouton une led correspondante s'allume.
merci de me partager vos idées  ;)

merci de ne poster qu'une seule fois vos questions.

merci de poster votre code et votre design


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