Embedded Systems Design with the Atmel AVR Microcontroller Part II

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232 CHAPTER 7. ATMEL AVR OPERATING PARAMETERS AND INTERFACING 240 Figure 7.26: Controlling a low voltage motor. + M 3 VDC - 1N4001 1N4001 5 VDC 1N4001 7.5. What is switch bounce? Describe two techniques to minimize switch bounce. 7.6. Describe a method of debouncing a keypad. 7.7. What is the difference between an incremental encoder and an absolute encoder? Describe applications for each type. 7.8. What must be the current rating of the 2N2222 and 2N2907 transistors used in the tri-state LED circuit? Support your answer. 7.9. Draw the circuit for a six character seven segment display. Fully specify all components. Write a program to display “ATmega16. ” 7.10. Repeat the question above for a dot matrix display. 7.11. Repeat the question above for a LCD display. 7.12. What is the difference between a unipolar and bipolar stepper motor? 7.13. What controls the speed of rotation of a stepper motor? 7.14. A stepper motor provides and angular displacement of 1.8 degrees per step. How can this resolution be improved?
from micro I 7404 V DD Figure 7.27: DC fan control. R Solid State Relay R G G M D MOSFET S REFERENCES 233 DC motor supply voltage I LOAD protection diode 7.15. Write a function to convert an ASCII numeral representation (0 to (9) to a seven segment display. 7.16. Why is an interface required between a microcontroller and a stepper motor? 7.17. Construct UML activity diagrams for the GLCD functions provided in the chapter. REFERENCES D. Pack and S. BarrettS (2002) 68HC12 Microcontroller: Theory and Applications. Prentice-Hall Incorporated, Upper Saddle River, NJ. S. Barrett and D. Pack (2004) Embedded Systems Design with the 68HC12 and HCS12. Prentice- Hall Incorporated, Upper Saddle River, NJ. Crydom Corporation, 2320 Paseo de las Americas, Suite 201, San Diego, CA (www.crydom.com). Sick/Stegmann Incorporated, Dayton, OH, (www.stegmann.com). Images Company, 39 Seneca Loop, Staten Island, NY 10314. Atmel 8-bit AVR Microcontroller with 16/32/64K Bytes In-System Programmable Flash, ATmega164P/V, ATmega324P/V, 644P/V data sheet: 8011I-AVR-05/08, Atmel Corporation, 2325 Orchard Parkway, San Jose, CA 95131.
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Embedded Systems Design with the At
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iv An Introduction to Logic Circuit
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Copyright © 2010 by Morgan & Clayp
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ABSTRACT This textbook provides pra
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x CONTENTS 7 6.9.3 Input Capture Mo
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xii CONTENTS A 8.5.3 Circuit diagra
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Preface In 2006 Morgan & Claypool P
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Author’s Biography STEVEN F. BARR
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296 INDEX switch debouncing, 187 sw
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Embedded Systems Design with the Atmel AVR Microcontroller Part II

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