arkhipenko made an impressive Predator costume, complete with a head-tracking plasma gun.
This full-body costume features animatronics, two sound systems, laser lights, and props such as plasma gun! A Teensy 3.5 was more than up for the task of of being the brains of it all. The electronics are mounted in the plasma gun backpack that was cleverly made from a bicycle helmet.
More details on the build can be found on this Instructables page.
Source code for the project is available on GitHub.