This chapter introduces the main concepts of serial data communication, including Master, Slave, clock, and the shift register. It distinguishes between synchronous and asynchronous serial forms. It introduces the features of a serial peripheral interface (SPI) link, and how this can be applied using two mbeds communicating with each other. As an advance on SPI, the inter-integrated circuit bus (I 2 C) is introduced. Again, the principles are illustrated by linking two mbeds. The advantages and disadvantages of SPI and I 2 C are evaluated. Concepts of asynchronous serial communication are introduced, and an asynchronous data link between the universal asynchronous receiver/transmitter (UART) ports of two mbeds is established. The use of UART to link mbed and host computer is explained. At a more sophisticated level, universal serial bus is introduced, and simple mbed applications explored.

Cycling is a sport with increasingly admirers and practitioners all over the world, and due to that, there have been an interest boost on this sport modality. The use of auxiliary systems to improve training methodologies and consequently enhance cycling technique and performance would be extremely important for athletes and coaches. The goal of this study was to develop a measurement system for cycling. This system is composed by two entities: physical devices that must collect, store and send the data read by the sensors and a smartphone that works as a display interface. Transmission between these two entities is performed via wireless communication based on Bluetooth Low Energy technology. A set of experimental tests were performed with an athlete in order to evaluate his positioning on the bicycle and its pedaling movement. The system’s sensory nodes were positioned on the right lower limb of the athlete, namely in the thigh and shank. The Euler angles values of each device were collected in order to obtain the resulting knee angle along the trials. The implementation of this system allowed a real-time feedback and a more detailed posttraining analysis, functioning as a support tool for the athlete be able to optimize his cycling performance.

background or methods

/pdf/measurement-system-for-evaluation-of-cycling-performance-24pjgom7nh.pdf

Starting with Serial Communication

Measurement System for Evaluation of Cycling Performance

From the Publisher:
This updated edition continues to provide readers with the background needed to understand and use microcontrollers, specifically the popular Motorola 68HC11. The 68HC11 is relatively easy to work with and has most of the features essential for a complete control system. The book starts at an introductory level by explaining the applications and origins of microcontrollers. Next, a programmer's view of the device is developed. Finally, the hardware is described and the reader learns how to connect it to the outside world for control applications. 
Many changes have been made to this edition:
To acknowledge the prominence of C programming, the topic is introduced earlier and the text uses C program examples throughout.
A CD-ROM containing source code, a special demo version of the THRSim11 simulator, a IC11 demo C compiler, a cross assembler, fuzzy logic tools, and assorted electronic design tools is included. Because it provides a practical way to explore programming and interfacing concepts, readers will find the simulator extremely useful.
Chapter openers now list learning objectives to help the reader pick out the important points in each chapter.
Numerous helpful appendices have been added to reinforce key topics.


This book is an excellent guide and reference, and it will prove indispensable to students of control automation and interested amateurs, as well as to experienced users of microcontrollers. 

An Instructor's Manual (ISBN 0-13-033248-8) is available free of charge to instructors using the book for a course.

Starting with Serial Communication

Citations

Measurement System for Evaluation of Cycling Performance

References

Microcontroller technology, the 68HC11

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