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Inertial motion units (IMUs) where conceived as a support element for precision in military navigation systems; now it’s projected to use it to entertain and create music.This paper is a compendium that covers all the stages of the development of the inertial motion unit built as a master thesis research work by David Espina supervised at Mälardalen University and valid for his home institution, Universidad Pública de Navarra, as a part of an exchange program. The development of the project is dated on January 2010 and the ending of the research is october 2010. The objective of this project was to design and implement an IMU unit using as many resources as possible from other projects going on at MDH. In this manner, the development process would get first hand documentation from the master and PhD students who worked on the listed technologies: PCB design, ATmega micro controllers, USB-Serial communications, Bluetooth ® stack, Honeywell magnetometer, ST Electronics gyroscopes and accelerometer. The project was planned from start analyzing the different stages of the work: data gathering, schematic, layout, manufacturing, mounting, testing, code writing and programming. Before the beginning of the project there has been a learning process of different programming platforms and environment such as ADA, AVR Studio and Cocoa for iPhone applications. After the research was over this paper began to be written.The paper covers the work done from the idea to the first finished version of the firmware of the prototype.The writing has been structured following the strict development process with a previous general description of every part that conforms the system, which will be referred as  iMYou attending as a nickname for the IMU device built. The preface is numbered as part number two. This second part tries to answers questions such as why? and when?, related to the subject of the project and the origin of the idea.The third part of the paper is an introduction which covers aspects about previous work performed by other students, different institutions and different companies. It shows that the iMYou device is not 100% an innovative device, but an interesting approach to bring engineering into multimedia and business.The fourth part explains in detail the development process, starting with a description of the technologies used, followed by an explanation of the whole system and detailed description of every submodule and component, both hardware and software. This part covers the methodology followed, the decisions taken, problems that emerged from those decisions and also the strategy adopted to broad those problems. There are figures and tables the complete the explanations in a graphic and structured way. Part five is a conclusion after analyzing those results taken after the research, built and programming were done. To be noticed that this was a project aiming to keep a low price of non-recurrent engineering (NRE) since there was a market idea behind.The sixth part is a guide for those who want to continue with the development and upgrading of the iMYou system. This way anyone with the proper background can easily understand the purposes and protocols not to waste time reading and understanding from the beginning and get to work straight away with a clear picture of what they have to do.In the ninth part there are some personal thoughts of how to continue working on the iMYou device and future developers have suggestions of what there could be changed of improved.The seventh part is a list of sources and references.The are two last parts called Appendix A and Appendix B where the source code can be found.Keywords: inertial motion unit, RS232, hyper terminal, USB, Bluetooth, gyroscope, accelerometer, compass, SMD, CAD, baud rate, UART, TWI, ISP, ADC, I2C, SPI, ADA programming, AVR Studio, Ultiboard, Multisim, Eagle, C/C#, Objective C.