Embedded Systems Design with the Atmel AVR Microcontroller Part II

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x CONTENTS 7 6.9.3 Input Capture Mode 163 6.10 Servo Motor Control with the PWM system ................................165 6.11 Pulse Width Modulation: Automated Fan Cooling System ...................170 6.12 Summary ................................................................178 6.13 Chapter Problems ........................................................179 References .....................................................................180 Atmel AVR Operating Parameters and Interfacing .................................181 7.1 Operating Parameters .....................................................182 7.2 Battery Operation ........................................................185 7.2.1 Embedded system voltage and current drain specifications 185 7.2.2 Battery characteristics 185 7.3 Input Devices ............................................................185 7.3.1 Switches 185 7.3.2 Pullup resistors in switch interface circuitry 187 7.3.3 Switch Debouncing 187 7.3.4 Keypads 189 7.3.5 Sensors 194 7.3.6 LM34 Temperature Sensor Example 196 7.4 Output Devices ..........................................................197 7.4.1 Light Emitting Diodes (LEDs) 197 7.4.2 Seven Segment LED Displays 197 7.4.3 Code Example 198 7.4.4 Tri-state LED Indicator 201 7.4.5 Dot Matrix Display 201 7.4.6 Liquid Crystal Character Display (LCD) 204 7.4.7 Graphic Liquid Crystal Display (GLCD) 207 7.4.8 High Power DC Devices 216 7.5 DC Solenoid Control .....................................................216 7.6 DC Motor Speed and Direction Control ...................................218
8 CONTENTS xi 7.6.1 DC Motor Operating Parameters 219 7.6.2 H-bridge direction control 219 7.6.3 Servo motor interface 220 7.6.4 Stepper motor control 220 7.6.5 AC Devices 229 7.7 Interfacing to Miscellaneous Devices .......................................229 7.7.1 Sonalerts, Beepers, Buzzers 229 7.7.2 Vibrating Motor 229 7.7.3 DC Fan 229 7.8 Summary ................................................................231 7.9 Chapter Problems ........................................................231 References .....................................................................233 System Level Design............................................................235 8.1 Overview................................................................235 8.2 Weather Station ..........................................................236 8.2.1 Requirements 236 8.2.2 Structure chart 236 8.2.3 Circuit diagram 236 8.2.4 UML activity diagrams 237 8.2.5 Microcontroller code 237 8.3 Motor Speed Control .....................................................251 8.4 Circuit diagram ..........................................................251 8.4.1 Requirements 254 8.4.2 Structure chart 254 8.4.3 UML activity diagrams 255 8.4.4 Microcontroller code 255 8.5 Autonomous Maze Navigating Robot ......................................263 8.5.1 Description 263 8.5.2 Requirements 263
Page 1: Embedded Systems Design with the At
Page 4 and 5: iv An Introduction to Logic Circuit
Page 6 and 7: Copyright © 2010 by Morgan & Clayp
Page 8 and 9: ABSTRACT This textbook provides pra
Page 12 and 13: xii CONTENTS A 8.5.3 Circuit diagra
Page 15: Preface In 2006 Morgan & Claypool P
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182 CHAPTER 7. ATMEL AVR OPERATING
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236 CHAPTER 8. SYSTEM LEVEL DESIGN
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270 APPENDIX A. ATMEGA164 REGISTER
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272 APPENDIX A. ATMEGA164 REGISTER
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Author’s Biography STEVEN F. BARR
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296 INDEX switch debouncing, 187 sw
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