Some time ago I was informed that the surfaces of the amazing Media-TIC building (from Cloud 9 / Enric Ruiz Geli) were Arduino-based, sensing the environment/atmospheric changes and offering a 20% saving on climate control:I did a quick search for more info on how they integrated arduino's but I haven't found anything so far
The building is in the shape of a cube and formed by large iron beams covered in a plastic coating of inflatable bubbles, which offer glimpses of the fluorescent structure of the building. The attractive covering also has a functional utility as a way of regulating light and temperature, primarily preventing 114 tons of CO2 a year from escaping from the building, and offering a 20% saving on climate control.
Every facade of the Media-TIC is different: from the outside, they reveal parts of their interior spaces and give a diverse plasticity, while from the inside they offer spectacular views.
Another interesting thing from the blog is that someone has created a arduino plugin for Rhino's GrassHopper
Firefly for Grasshopper / Arduino from Jason K Johnson on Vimeo.
This is definitely something I will look at using in the future