A UML Documentation for an Elevator System：This paper is a PhD project report for the course Distributed Embedded Systems at Carnegie Mellon University. Throughout this course, a distributed real-time system – an elevator control system– is specified

Designing Embedded Hardware Ebook By John Catsoulis If you want to build your own embedded system, or tweak an existing one, this invaluable book gives you the understanding and practical skills you need.

A good source for embedded system developers to know the rules of embedded system developement