Analog inputs if I understande correctly output a varying voltage. For example a potemimenter(spelling really badly) is a analog input. As you turn the pot it's voltage varies. This is a analog device. Digital devices usually are either on or off like a switch. I hope this answers your question.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
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