Do you have an old tablet computer which is slow and don’t have the latest android version? Why not using is as a controller for your smart home?
To make it a bit more useful in daily life you can add a wireless charger. You can by a wireless charging receiver for example here. You need to check the orientation of your micro USB port. Because you can use the the coil only in one direction, you need to buy one with the right orientation!
After you placed the device correctly you shall cover it with a plastic cover
Buy a wireless charging unit which is big enough to hold your tablet:
I use HABPanel with google chrome as UI interface. It looks very nice on a tablet and you can configure different views for different devices. I really like it. On smaller phone displays go with standard sitemaps and basic UI. Only as a personal recommendation.