I need to read the exact voltage

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i need read data voltage across arduino, after having read range of form -> 4.15 volts 4.50 volts && -> send me serial character doors, , can read character interface.

sorry dharem none of makes sense. assume english not primary language (at least hope :)).

what character? doors? 4.15 , 4.5 volts come from? what's , operator (&&) got it? "across arduino" mean?

can spell out application in simple point form?
______
rob


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