Yeah, what you are seeing is just floating unconnected pins. It’s harmless, but if it really bothers you, just tie those pins to ground and you won’t see them moving around. The MUX code is for use with one or more analog multiplex chips to multipy the inputs if you need lots of analog sensors. Depending on usage it might require a little customization in the arduino sketch.
Jan 6, 2014 at 12:39pm #277576