Embedded Systems Design with the Atmel AVR Microcontroller Part II

CHAPTER 8
System Level Design
Objectives: After reading this chapter, the reader should be able to
Design an embedded system requiring a variety of microcontroller subsystems and input and
output devices.
Design circuits to interface the microcontroller with required system input and output devices.
Employ a variety of tools to design embedded systems.
8.1 OVERVIEW
In this chapter, we design three different microcontroller-based embedded systems to illustrate
concepts presented throughout the text. We have chosen these systems to expose the reader to a
wide variety of requirements, peripheral devices, and interface techniques for microcontroller-based
embedded systems. We provide basic designs for the three systems and challenge the reader to extend
the designs with additional features. The three systems are:
a weather station,
a motor speed control circuit, and
an autonomous maze navigating robot.
For each system we provide the following:
a system description,
system requirements,
a structure chart,
a system circuit diagram,
UML activity diagrams, and
the associated microcontroller code.
235