words:
http://www.repaper.org/reference.html
--> http://www.repaper.org/doc/cog_driving.html
    http://www.repaper.org/doc/em027as012.html

code:
https://github.com/repaper/gratis/blob/master/Sketches/demo/demo.ino
https://github.com/repaper/gratis/tree/master/Sketches/libraries