Design automatic temperature balancing circuit and control device via SMS

ACKNOWLEDGEMENTS

I would like to sincerely thank the teachers of the Vietnam - Korea Friendship Information Technology College, who directly taught and imparted useful knowledge to me, which are the basic foundations, the extremely valuable provisions, the first step for me to enter my future career. Especially Ms. Tran Thi Tra Vinh has wholeheartedly helped me throughout the internship until the completion of the graduation project, answering questions during the implementation process. Thanks to that, I was able to complete this graduation project.

During the project, due to limited time, the graduation report will inevitably have errors. I sincerely hope to receive comments from teachers and friends so that my knowledge can be increasingly improved and I can draw useful experiences that can be effectively applied in practice in the future.

I wish you always happy, healthy and successful in your work.

Thank you very much.

Da Nang, May 2016

Le Tan Vang

INDEX

THANK YOU i

TABLE OF CONTENTS ii

LIST OF ABBREVIATIONS v

LIST OF DRAWINGS vii

LIST OF TABLES ix

INTRODUCTION 1

CHAPTER 1 OVERVIEW OF GSM NETWORK AND SMS MESSAGING SERVICE 2

1.1. OVERVIEW OF GSM MOBILE INFORMATION SYSTEM 2

1.1.1. Introduction to GSM mobile communication system 2

1.1.2 Characteristics of GSM mobile communication system 2

1.1.3 Structure of GSM mobile communication system 3

1.1.3.1 General structure 3

1.1.3.2 Components of GSM mobile communication system 3

1.1.4 Development of mobile information systems in Vietnam 4

1.2. OVERVIEW OF SMS MESSAGES 4

1.2.1 Introduction to SMS 4

1.2.2 Structure of an SMS message 6

1.2.3 SMS Message Sequence 7

1.2.4 SMS CENTER/SMSC 7

1.2.5 International SMS Messaging 8

CHAPTER 2 PIC16F887 MICROCONTROLLER 9

2.1. INTRODUCTION TO PIC (Programmable Intelligent Computer) 9

2.1.1. Introduction to PIC 9 microcontroller

2.1.2. Advantages and disadvantages of PIC 10

2.2 GENERAL INTRODUCTION TO PIC16F887 10

2.2.1 Introduction to PIC16F887 10

2.2.2 Block diagram of PIC16F887 12

2.3 SURVEY OF PIN DIAGRAM, FUNCTION OF EACH PIN 13

2.3.1 PIC16F887 microcontroller pin diagram 13

2.3.2 Memory organization 15

2.3.2.1 Program memory 15

2.3.2.2 Data memory 17

2.3.3 I/O ports of PIC16F887 17

2.4 ANALOG-DIGITAL CONVERTER (ADC) 19

2.4.1 AD 20 conversion result

2.4.2 Analog-to-digital conversion steps 21

2.4.3 ADC registers 22

2.5 COMPARATOR 22

2.6 EUART 24 SERIAL COMMUNICATION

2.6.1 The EUSART operates in asynchronous mode 24

2.6.1.1 EUSART 25 Asynchronous Transmitter

2.6.1.2 EUSART 26 Asynchronous Receiver

2.6.1.3 Clock accuracy with asynchronous operation 28

2.6.2 The EUSART operates in synchronous mode 30

2.7 TIMER 30 OPERATION

2.7.1 TIMER0 30 timer

2.7.2 TIMER1 32

2.7.3 TIMER2 34

2.8 INTERRUPT 35

CHAPTER 3 DESIGNING A CIRCUIT TO AUTOMATICALLY BALANCE TEMPERATURE AND CONTROL DEVICES VIA SMS MESSAGES 37

3.1 INTRODUCTION TO SIM900A MODULE, AT COMMAND SET. 37

3.1.1 Introduction to SIM900A module 37

3.1.2 Features of SIM900A module 37

3.1.3 Examine the pin diagram and function of each pin 40

3.1.4 Survey of AT command set of SIM900A module 42

3.2 SYSTEM BUILDING 44

3.2.1 Automatic temperature balance section 44

3.2.2 SMS control section 45

3.3 HARDWARE DESIGN 46

3.3.1 Circuit diagram 46

3.3.1.1 Source 46

3.3.1.2 Thermal balance circuit 46

3.3.1.3 Control circuit 47

3.3.1.4 Relay 47

3.3.3 Layout circuit 48

CHAPTER 4. RESULTS ACHIEVED BY THE SYSTEM 50

4.1 RESULTS ACHIEVED 50

4.2 PRODUCT OPERATION PROCESS 50

CONCLUSION 53

REFERENCES x

APPENDIX xi

LIST OF ABBREVIATIONS

Written Words

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English Terminology	Vietnamese terminology
3GPP	Third Generation Partnership Project	Third-party collaboration projects
ADC	Analog Digital Converter	Signal converter from analog to digital
AUC	Authentication Center	Authentication Center
BSS	Base Station Subsystem	Sub-base station system
BTS	Base Transceiver Station	Base Transceiver Station.
CDMA	Code Division Multiple Access	Code division multiple access
CSPDN	Circuit Switched Public Data Network	Public data network channel circuit
EDGE	Enhanced Data Rates for Global Evolution	Increase data transmission speed
EIR	Equipment Identity Register	Device identification logger.
ETSI	European Telecommunications Standards Institute	Telecommunications Standards Institute Europe
GPRS	General Packet Radio Service	General Packet Radio Service
GSM	Global System for Mobile Communications	Digital Mobile Information System global
HLR	Home Location Register	Place of permanent registration
ISDN	Integrated Services Digital network	Integrated Services Digital Network.
MS	Mobile Station	Mobile station
MSC	Mobile-services Switching Centerr	Switching center network service
NSS	Network Switching Subsystem	System switching network child
OMC	Operation and Maintenance Center	Exploitation and maintenance center nourish
OSS	Operation Subsystem	Subsystem operations
PIC	Programmable Interface Controller	Programming control interface

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Public Land Mobile Network	Terrestrial mobile network.
PSP	Parallel Slave Port	Parallel Sub Port
PSPDN	Packet Switch Public Data Network	Data switching network public
PSTN	Public Switch Telephone Network	Public switched telephone network.
PWM	Pulse Width Modulation	Voltage regulation method
SIM	Subscriber Identity Module	Subscriber identification module
SMS	Short Message Service	Short Message Service
SMSC	Short message Service Center	Short Message Service Center
SPI	Serial Peripheral Interface	Serial peripheral communication
TDM	Time Division Multiplexing	Time division modulationspace
TDMA	Time Division Multiple Access	Time division multiple access
USB	Universal Serial Bus	Common serial port
VLR	Visitor Location Register	Registration address
WAP	Wireless Application Protocol	Application Protocol No wire

PLMN

LIST OF DRAWINGS

Number

effect

Image name	Page
1.1	Structure of GSM mobile communication system	3
1.2	GSM system components	3
1.3	Structure of an SMS message	6
2.1	PIC16F887 microcontroller block diagram	12
2.2	PIC16F887 microcontroller pin diagram	13
2.3	PIC16F887 program memory	16
2.4	Register address of PIC16F887	17
2.5	Block diagram of AD	20
2.6	Clock cycle and operating frequency of ADC	20
2.7	Ways to save 10 bit A/D conversion results	21
2.8	Registers related to the A/D controller	22
2.9	Working principle of a simple comparator	23
2.10	Simple block diagram of Comparator	23
2.11	Registers related to the comparator	24
2.12	Block diagram of asynchronous EUSART data transmitter	26
2.13	Registers involved in asynchronous transmission	26
2.14	Block diagram of asynchronous EUSART data receiver	27
2.15	Registers involved in asynchronous data reception	28
2.16	TXSTA register structure	28
2.17	RCSTA register structure	29
2.18	Timer 0 timer block diagram	31
2.19	Registers related to Timer0	32
2.20	T1CON: Timer1 control register	33
2.21	Timer1 block diagram	33
2.22	Registers related to Timer1	34
2.23	T2CON: Timer2 control register	35
2.24	Block diagram of Timer2 timer	35

Registers related to Timer2	35
3.1	SIM900A Module	39
3.2	SIM900A Module Pinout	40
3.2	Block diagram of self-balancing thermal system	44
3.3	Block diagram of device control system using SMS	45
3.4	Power circuit	46
3.5	Thermal balance circuit	47
3.6	Main control circuit	47
3.7	Relay	48
3.8	Temperature balance circuit	48
3.9	Main control circuit	49
4.1	Complete circuit	50
4.2	Turn on device 1	50
4.3	Device 1 enabled notification	50
4.4	turn off device 1	51
4.5	Device 1 turned off notification	51
4.6	Turn on device 2	51
4.7	Device 2 enabled notification	51
4.8	Turn off device 2	51
4.9	Device 2 turned off notification	51
4.10	Turn on device 3	51
4.11	Device 3 enabled notification	51
4.12	Turn off device 3	52
4.14	Turn on device 4	52
4.15	Device 4 enabled notification	52
4.16	Turn off device 4	52
4.17	Device 4 turned off notification	52
4.18	Check room temperature	52
4.19	Room temperature notification	52

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Design automatic temperature balancing circuit and control device via SMS - 1

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