First, let me say I fundamentally disagree with this idea. One of the benefits of a flexible user interface is to have it however YOU want it. No limitations of hardware and no clones! Size, color, location, number, graphics, etc. are for you to decide. Put as many as your want on one screen. Stack, go side by side, or have 30 PID displays on one screen - whatever you want whenever you want it.
Second, and more importantly, a major benefit to a software based system and user interface is expansion/modification, size, and control panel logistics. You can add and remove controls when you like, without drilling or cutting holes. Control boxes can be smaller and mounted remotely or hidden out of the way. The user interface is a computer monitor screen - so size and mounting are flexible and don't take much space. Micro-controller interfaces like the MEGA provide abundant I/O, so if you want to add more devices like elements, sensors, electric valves, etc., you can do so when your desire and budget allow it, then just add the software elements on the screen.
Note we do currently support this 20x4 LCD (see here:
https://www.homebrewtalk.com/showpost.php?p=7786009&postcount=230). We built this in primarily for use with remote controllers like fermenter or kegerator controls, but you can use it in your brewery if you want. We just added these to the Order List.
Now, all that said, if you *really* want a 7-segment display (like this one:
https://www.adafruit.com/product/1268), I can add it easily enough. I want to build a solution that you want to use and are happy with!
