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Last week, Ali and I attended the 2012 Over The Air, a mobile applications themed hackday. It was held at Bletchley Park, home to the National Museum of Computing, among other things.

There was an extremely packed schedule comprising of talks on a whole manner of subjects relating to the mobile web. I managed to attend the talks on QR codes, WebRTC, Facebook Graph API, O2 Labs and the keynotes.

I would have loved to have seen more, however, we had a hack to build.

Ali had an mbed and a GPS/GPRS module that he had used for his solo project. We decided to use the mbed platform as they were at the event with Vodaphone 3G dongles. We created Dude, Where's My Car?

The mbed device, connected via the 3G dongle, sends GPS co-ordinates to the server every few seconds. These appear in the timeline on the website. You can then create a trip by selecting start and stop positions which is then shared with your friends on Facebook using the open graph API. We made actions of going on a trip which had properties including the trip name and geo-location data.

Ali also had a OBD (On Board Diagnostics) interface that connects to a car. Through this device, the mbed could get a number of parameters from the car such as speed, throttle, rpm, engine temperature etc. This data was added to the server along with the GPS and pased through to Facebook wihin the open graph metadata. It was then used to generate averages, minimums and maximums for the car data. All this then appears on your Facebook timeline looking like the example below.

We demo-ed our hack to the judges and audience and ended up winning both the Facebook Open Graph Challenge and the Embedded Hardware Hack Challenge. They loved how we took the real-world action of driving and sharing that with your friends.