Approach

This solution is approached by creating a shower head that is lined with a neopixel ring, which is connected to a waterproof TMP temperature sensor. The neopixel light will turn blue when the water is first turned on and is still cold; it will gradually turn from blue to yellow to red as the water gets hotter. Blue indicates cold water; red, hot water; and yellow indicates the right temperature.

Once the potentiometer knobs are turned on, they will begin collecting information about the water volume exiting the shower head. This information is linked to a servo that will begin to change its angle as more water is used. This angle indicates the amount of water used on a meter indicator.