With exams behind him [Adam Greig] had time to make a Nerf sentry gun. It’s actually quite easy to pull everything together. He’s got a netbook running Motion, an open source motion sensing program ...

The SwarmTurret is a Raspberry Pi-powered Nerf turret controlled via phone. It has a camera for aiming and can be accessed over a local network. A guide is available on Instructables, with 3D model ...