Among all the Arduino boards ... by simply dividing the input value into four as seen in this basic example code or by using the map() function, as you can see in this Analog In, Out Serial ...

There are five input ... analog pin to any one of 32 analog pins. Of course, in addition to the five control lines, you need some handshaking lines, too so you could use as many as eight digital ...

Luckily [Paul Martinsen] has put together a primer of three different ways to use an Arduino to filter signals. The first (and fastest, simplest, etc.) way to filter an analog signal is to sample ...