Interrupts from a 12v square wave signal... How to reduce voltage to 5v?

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i building tachometer car, , signal produced engine computer 12v square wave rpm signal.  how go using signal input arduino pin?  have read max input voltage around 5.5v, guessing current 12v square signal fry arduino.  best way reduce voltage can use wave signal , count interrupts tachometer signal?  thanks



Arduino Forum > Using Arduino > Project Guidance > Interrupts from a 12v square wave signal... How to reduce voltage to 5v?


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