the IRIS project
by overflo, published
Some weeks ago i found chris schaie's  iris on hackaday  and i was so amazed that i took a screenshot from the video and made my own iris based upon his design.
From there it was a long road but eventually my own design worked out and i managed to create a mechanical iris that can be opened with a stepper motor.
Now we have a welcoming system at the metalab 
Documentation can be found @ http://metalab.at/wiki/iris
To build the thing you need
- a lasercutter
- wood (i used 8mm)
- 3 ball bearings from rollerblades
- a stepper motor + controller electronics