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ANALOG TO DIGITAL CONVERTOR INTERFACE

WITH 8051 MICROCONTROLLER

DEBANAND MAJHI (109EE0278)

BRAJESH ANAND (109EE0638)

SAKSHAM MISHRA (109EE0639)

Department of Electrical Engineering

National Institute of Technology Rourkela

- 2 -

ANALOG TO DIGITAL CONVERTOR INTERFACE

WITH 8051 MICROCONTROLLER

A Thesis submitted in partial fulfillment of the requirements for the degree of

Bachelor of Technology Electrical Engineering

By

DEBANAND MAJHI (109EE0278)

BRAJESH ANAND (109EE0638)

SAKSHAM MISHRA (109EE0639)

Under guidance of

Prof. SUPRATIM GUPTA

Department of Electrical Engineering

National Institute of Technology

Rourkela-769008 (ODISHA)

May-2013

- 3 -

DEPARTMENT OF ELECTRICAL ENGINEERING

NATIONAL INSTITUTE OF TECHNOLOGY, ROURKELA

ODISHA, INDIA-769008

CERTIFICATE

Analog to Digital Convertor Interface with 8051

MicrocontrollerDebanand Majhi (Roll. No. 109EE0278), Brajesh Anand (Roll. No. 109EE0638) and Saksham Mishra (Roll. No. 109EE0639) in partial fulfilment of the requirements for the award of Bachelor of Technology in Electrical Engineering during session 2012-2013 at National Institute of Technology, Rourkela. A bonafide record of research work carried out by them under my supervision and guidance. The candidates have fulfilled all the prescribed requirements. degree/diploma. In my opinion, the thesis is of standard required for the award of a bachelor of technology degree in Electrical Engineering.

Place: Rourkela

Dept. of Electrical Engineering Prof. Supratim Gupta

National institute of Technology

Rourkela-769008

i

ACKNOWLEDGEMENTS

We would like to articulate our deep gratitude to our project guide Prof. SUPRATIM GUPTA who has always been source of motivation and firm support for carrying out the project. We would also like to convey our sincerest gratitude and indebtedness to all other faculty members and staff of Department of Electrical Engineering, NIT Rourkela, who showed their great efforts and guidance at required times without which it would have been very difficult to carry out our project work. Moreover , an assemblage of this nature could never have been attempted with our reference to the works of others whose details are mentioned in the references section at the last. We acknowledge our indebtedness to all of them. Furthermore, we would like to take the name of our parents and God who directly or indirectly encouraged and motivated us during this dissertation. ii

ABSTRACT

In this paper we shall study how a 8051 microcontroller is interfaced with an analog to digital convertor(ADC). An ADC is a real world device which converts real time continuous quantities into digital values that represent the amplitude of the quantity. An ADC converts input analog signals by quantizing it. Higher the sampling rate used to discretize the values more will be the accuracy with which the output from ADC is obtained. ADCs may be used in Digital Signal Processing, in commercial applications as well as in music industries to convert the data from analog to digital in order to create the data that will be used in compact disks. Further the circuit has been simulated using PROTEUS Demo version. iii

CONTENTS

Abstract i

Contents ii

List of Figures v

List of Tables viii

CHAPTER 1

INTRODUCTION

1.1 Motivation 1

1.2 Microcontroller Architecture 1

a) Features of 8051 2 b) Registers 2 c) Pin Description of 8051 3

1.3 ADC Architecture 5

CHAPTER 2

8051 MICROCONTROLLER WITH ADC

2.1 Algorithm for programming ADC 8

2.2 Assembly program to interface ADC with 8051 8

iv

CHAPTER 3

SIMULATION AND OUTPUT

3.1 Output 14

3.2 Output Analysis 15

CHAPTER 4

CONCLUSION

v

LIST OF FIGURES

Fig. No Name of the Figure Page. No.

1 8051 Microcontroller Block Diagram 2

2 8051 Microcontroller 5

3 ADC 0808 6

4 Block Diagram for interfacing ADC with 8051 Microcontroller 8

5 Circuit Diagram for interfacing ADC with 8051 14

vi

LIST OF TABLES

Table. No. Name of the Table Page. No.

1 Features of 8051 2

2 Output 14

1

CHAPTER1

Introduction

1

1.1 MOTIVATION:

In embedded system, it is essential that microcontrollers take analog input. Sensors and transducers used in industry are analog in nature. We need to convert the analog output from the sensors to digital so that the corresponding signal can be processed by the controller. These are generally used in control operation and instrumentation in industries. ADCs are used everywhere when we have to process, store or transmit an analog signal in digital form. ADCs are used in TV tuner cards and for digital data processing in microcontrollers in the form of on chip 8 bit, 10 bitquotesdbs_dbs2.pdfusesText_3