No, there are no "standards" nor "accepted solutions" for random devices. Your PC has a keyboard and mouse because that is what a PC is. Remove the keyboard and mouse and replace it with a touch screen and you have a tablet.
The device defines the interface. When you are designing a new device you design the interface. If the device performs the same function (or very similar) to some other device it makes sense, during your research, to investigate the interfaces that the other devices use and find what works and what doesn't, and design your interface accordingly.
If your device requires a lot of data to be entered manually then some form of keyboard that allows that data entry would be appropriate - be that a full QWERTY keyboard, or a simple numeric keypad.
Maybe a touch-screen would be a more appropriate way of controlling your device if you are mainly selecting between pre-defined options and settings.
What kind of a display you want to use depends very much on what it is you want to display. For just numeric information you could use 7 segment LED displays. Maybe an LCD display would be better if you want small amounts of textual information. Or just simple status indicators (LEDs).
The point is: the interface is dictated by what you need to interface and how you need to interface it, not some ephemeral idea of a standard. Your device is unique (or you're infringing some patent these days ;) ) so your interface will be dictated by that uniqueness.