I looked into adding GPIO to an Android/Ubuntu phone a while ago.. Something like this should work with many phones for about $20 - http://www.ebay.com/itm/Geee

I looked into adding GPIO to an Android/Ubuntu phone a while ago.. Something like this should work with many phones for about $20 - http://www.ebay.com/itm/Geeetech-IOIO-OTG-development-board-with-USB-OTG-cable-for-Android-device-PC-/222215803989 http://www.ebay.com/itm/Geeetech-IOIO-OTG-development-board-... I think mobile phones could be really nice for robotics - they have 4G/wifi/bt connectivity, large battery, touch screen, sensors, IMU, camera, gps, fast CPUs - and they are cheap and often surplus. Especially once mobile GPUs get better and start getting support from machine learning frameworks