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Digital Shower

I am planning and researching ideas on creating a DIY digital shower system. 

The idea is to have an android device (Tablet, or old galaxy SII phone for now) installed along with an ardruino or some hardware interface to control the plumbing. 

I would also like to use the android device for music weather etc. in the shower, but all that is built in. The only puzzle with the android device is getting it to interface with the hardware, and waterproofing it while still keeping the touchscreen functionality. 

Any help would be greatly appreciated.