I'm planning to participate at a 48 hour hackathon. This is my first hackathon and I'm searching for some ideas. The hackathon has no theme, all ideas are allowed, but I'm more oriented towards microcontroller embedded applications with the possibility to team up with a mobile app and/or web app guy. I have decent knowledge of C, Python, Linux, electronics, signal processing, working with all kinds of sensors/actuators. I'm also passionate about FPGAs, computer security and game development. The organizers will provide only basic hardware like measurement equipment and dev boards like Arduino and RasPi, anything else we need we must bring it ourselves, but I'm fine with that. Any hints, advice or ideas for my first hackathon project will be welcome.