I'm new to Raspberry Pi and I had a few questions. I want to connect a raspberry pi to a e-ink display, it will retrieve content over wifi. It will only display when a motion sensor picks up on light in the room (or movement, whatever). By doing this, I hope that it will save a considerable amount of power, and so when powering the whole thing via a battery I'm hoping it will last quite a while (anyone able to estimate how long?). Obviously something will still be requiring power when it is idle, because it needs power to constantly look for motion, does anyone know how much this uses up?
If I put the whole thing in a waterproof casing fit for the raspberry pi will it protect it from humidity from steam that you get when the showers been on for a while in the shower? By casing it up, will it then overheat?