Thanks to its innovative gameplay and quirky humor, Portal became an instant hit ... A motion sensor activates the Turret whenever a human moves nearby. It will then open its wings and fire ...

and turrets. After playing Portal 2 for a bit, [Jonathan] wanted a turret of his own quite badly. Rather than construct it from hard plastics and resins however, he decided he wanted to construct ...

Reckless_commenter has created a Raspberry Pi-powered sentry turret that looks and sounds just like the creepy machines found ...