I just downloaded the MINDroid app for android to see how the crawling bot can be controlled via bluetooth. It works pretty nice so far, so the whole bluetooth communication shouldn't be that hard to implement in my own app later on. However, I want to control the robot via a browser so the android device's tilt is not of interest right now. Over the next couple of days I need to implement my own version of a controlling app. Luckily the MINDroid app is open source and available at: github.
Here is a small demo of the remote controlled crawler.