For years we've had Star Trek-level door-opening technology but
wasted it on supermarkets and nurse stations. No more! If you're
a nerd who's had enough of this egregious misuse of technology
and want it in your living quarters, Alex Shakespeare shows you
how.  The process isn't easy, and involves programming an
Arduino, some pneumatic valves, a piston, as quiet a compressor
as you can find, and, of course, IR sensors. Alex has the source
code for the Arduino part hosted on his site, and he
demonstrates how everything fits together in the video above.
It's probably not practical, especially since most doors in your
house can stay open all the time, but this could be a great
workshop or office entrance.  Alex Shakespeare | via Hackaday