a coffee machine. Each button let you make two different drinks. How to choose which one? Try to guess.
Yep. There is a status screen at the top that is actually a button. You press the screen. Duh.
What I don’t understand, you have a budget to make this complicated device, you add an interactive lcd display to it. So it’s not a dumb device. Yet. Yet you can’t make twice the buttons? A button per drink? It’s so obvious, so easy to use. Infinitely simpler. What makes you miss that and make both the implementation and the use harder? Why? Why?