With something like this: https://www.adafruit.com/product/2264 https://www.adafruit.com/product/2264 You can easily connect a lot of things to your mobile and

With something like this: https://www.adafruit.com/product/2264 https://www.adafruit.com/product/2264 You can easily connect a lot of things to your mobile and automate them. The phone already has a lot of sensors so I would think more along the line of "which motors can I connect my phone to?". You could build a robot for example...