Thanks high_flyer.
I know the HP Slate has Windows 7 (some version of it at least). So Qt is supported there. I just need to find a way to attach it nicely on a wall (including charging).
My father has a Siemens Logo plc for controlling different lighting circuits and other things. It has a little external controller with a 4x10 character LCD which of course is not easy to navigate in. So I wanted to put a touch screen in place. But if you start looking into ready made systems, you end up spending thousands of euro's/dollars.
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