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An alt with a bad voltage regulator can hit 20V+. That doesn't happen often, but it would suck to add your 'duino to the repair bill. I would go for divide-by-5 at least. That should give you a 0-25V range with 0.024V steps. Way more precision than necessary.
Last edited by bobski; 01-07-2011 at 07:06 PM..
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