Use data on SD card for controlling a servomotor

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i retrieve data recorded on sd card using microsd shield (i use sdfat library ).
these data in fact numbers between 0 , 1024 obtained sensor. want them , controlling servomotor, yet can't it.
i think i'm stuck because data on sd card automatically of type char, , servomotor request type int.
do have idea me ? thank !

quote
do have idea me ?

post code have reading data sd card.

look @ documentation atoi().


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