My Photon-based weather station has turned into such a project that I’m now out of pins for sensors, and there’s still a bunch more data I’d like to collect. My thought is to add a 4067 multiplexer to provide more channels, both analog and digital. Sparkfun has one of these in a convenient breakout: https://www.sparkfun.com/products/9056. Is there any reason this wouldn’t work? Is there a better alternative?
I’d also like to have more serial ports. I know there’s an extra “hidden” port on the Photon but I don’t want to start soldering on tiny lands. Anyway, I may need two extra serial lines. Can I do the same mux trick with TX/RX?