Tim Heath and Ryan Hickman have created an in expensive robotic prototyping environment using a Android phone, cardboard from the trash and around $20 worth of components. Check out the video for more information after the break.
The main reason for using a cell phone was to keep costs down as a standard smart phone comes equipped with everything you need straight from the box. Wi-fi, cellular connections, Bluetooth, GPS, touch sensing, accelerometers, magnetometers, displays, microphones, speakers, and cameras.
If you fancy building your own $20 dollar robotic environment prototype checkout all the source code and instructions here.
Have a look and our article on Android vs iPhone to see which smartphone and mobile platform is best for you.