If you are after more information about a person's actions than can be recorded or supplied by a digital input, you will need an analog input. For example, going back to the cat on the mat, if you wanted to measure the weight of that cat, then you would need a component capable of detecting the variables involved. An analog sensor, like a force-sensing resistor would benefit my project by determining the cats presence and weight.
I can see how Analog inputs can be very useful in some cases. This will ultimately be a decision influenced by the project concept.
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