Default [Q] using android as wall display?

I want to mount my old galaxy tab on the wall, keep it plugged in and awake, and use it as an information display from wifi. I specifically want to show the outdoor temp, expected high temp, and time. In other words a wall display I can control from my always-on PC.

I am a programmer so I can write PC software but I would prefer to not write android software. I'm hoping some existing app could show text or probably an image and remotely change the text or image.

I doubt such a thing already exists but I'm hoping someone can help me come up with a clever (kludge) solution.