Variabile char da SD

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ragazzi come faccio mettere in una variabile di tipo
char frase [];
il contenuto di un file txt letto da una sd? :)

non puoi, non esiste una variabile con le quadre. quello è un vettore/array e non ha dimensione dinamica, ma deve avere una dimensione fissa, che occuperà spazio in sram.    poi, la arduino uno ha per la sram solo 2kb, quanto è grande il file ? 
spiega meglio quel che vuoi fare.


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