Download PDF by Stuart Ball: Analog Interfacing to Embedded Microprocessor Systems. Real

By Stuart Ball

ISBN-10: 0750677236

ISBN-13: 9780750677233

  • Provides hard-to-find info on interfacing analog units and applied sciences to the simply electronic international of embedded microprocessors. offers the reader the perception and point of view of a true embedded platforms layout engineer, together with advice that just a hands-on specialist might recognize. Covers very important issues for either and software program systmes whilst linking analog and electronic units. -Embedded expertise ...a finished resource on interfacing the true global to microprocessors may still end up valuable to embedded structures engineers, scholars, technicians, and hobbyists. somebody enthusiastic about connecting the analog atmosphere to their electronic machines, or troubleshooting such connections will locate this publication in particular helpful. - Embedded expertise ordinarily, for the entire sections, there are many uncomplicated diagrams and in addition the math is saved to an easy point. ...I like this booklet and suggest it as an creation to the topic for domestic use, scholars and SW Engineers. - Chris Hills within the ACCU journal CVu ...there are lots of basic diagrams and in addition the math is saved to an easy point. i love this booklet and suggest it as an advent to the topic for domestic use, scholars and engineers. -Chris Hills within the ACCU journal CVu

Content:
Preface

, Page ix
Introduction

, Page xi
1 - approach Design

, Pages 1-12
2 - Analog-to-Digital Converters

, Pages 13-46
3 - Sensors

, Pages 47-90
4 - Time-Based Measurements

, Pages 91-106
5 - Output keep an eye on Methods

, Pages 107-143
6 - Solenoids, Relays, and different Analog Outputs

, Pages 145-169
7 - Motors

, Pages 171-213
8 - Electromagnetic Interference

, Pages 215-223
9 - High-Precision Applications

, Pages 225-241
10 - average Interfaces

, Pages 243-246
11 - Analog Toolbox

, Pages 247-273
Appendix A - Opamp Basics

, Pages 275-286
Appendix B - Pulse Width Modulation

, Pages 287-297
Appendix C - priceless URLs

, Pages 299-300
Appendix D - Python Code for bankruptcy eleven; Excel info for bankruptcy 4

, Pages 301-306
Glossary

, Pages 307-309
Index

, Pages 311-322

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Additional info for Analog Interfacing to Embedded Microprocessor Systems. Real World Design

Sample text

478 229 112 74 24 This is m u c h closer to the ideal result. O t h e r factors that would need to be included in a real application would be the tolerance of the voltage reference and the tolerance of the thermistor itself. A n o t h e r way to get this kind of accuracy is to calibrate the system after it is built. In many applications, this is not an option because the circuit boards and/or thermistor must be field replaceable. However, in cases where the e q u i p m e n t is not field replaceable, or where the field technicians have an i n d e p e n d e n t means to m o n i t o r the t e m p e r a t u r e , it is possible to let the software build a table of temperature-versus-ADC values.

In such a system, the-BUSY signal would typically be connected to the processor-RDY o r - W A I T signal. This holds the processor in a wait state until the conversion is complete. 5 ~ts. The second mode of operation is called ROM mode. In this mode the processor performs a read cycle, which places the S/H in hold mode and starts a conversion. During this read, the processor reads the results of the previous conversion. T h e - B U S Y signal is not used to extend the read cycle. Instead,-B USY is connected to an interrupt, or is polled by the processor to indicate when the conversion is complete.

This is most often a problem when working with smaller devices, such as the 8-pin Atmel ATtiny parts, or the 20- and 28-pin Atmel AVR and Microchip PIC devices. In some cases, you can make an analog input double as an output or make it handle two inputs. 17A shows how an analog input can also control two outputs. 5 V reference diode. A typical use for this design would be in an application where you are using the 5 V supply as the ADC reference, but you want to correct the readings for the actual supply value.

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Analog Interfacing to Embedded Microprocessor Systems. Real World Design by Stuart Ball


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