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HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY

FACULTY OF ELECTICAL ELECTRONICS ENGINEERING

DEPARTMENT OF TELECOMMUNICATION

PFIEV PROGRAM

---------------o0o---------------

GRADUATION THESIS

REMOTE CONTROL AND

MONITORING SYSTEM VIA SMS AND

INTERNET

Instructor: PhD. Hoang Dinh Chien

Student: Le Phuc Hoang

Student: Phan Tuan Duong

HCM, July 2009


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Abstract

This thesis consists of five parts. In the first part, we present block diagram of controlcircuits and models connection to connect these circuits with computer at the

processing center through infrastructure mobile network or internet network.

Programming algorithms for the microcontrollers in these circuits will be presented in

Part II. The most important part, communicating with the phone (PC vs. Phone,

Microcontroller vs. Phone), to access reality through infrastructure

telecommunications network is presented in part III. Part IV will present more details

about connection in the system as in UART connection, RF connection, internet

connection (using Yahoo server or TCP socket). Chapter five will present results and

discussion.

I .Circuit block and model connection

1.1 Main circuit block diagram

[1]MicrocontrollerPIC16F877A

[7]RS232

[2] LCDDisplay

[8] Power

[5] Relay block

[3] ReceiveRF block

[4]Sensors block(thermal, pH..)

[6] Switchblock

[9] PC

[10] Extension circuit

Main circuit

[11]Phone


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- The most important block in this circuit is [1] Microcontroller PIC16F877A (PIC),

coordinating activities of the remaining (control display ASCII characters on the LCD

display [1], the control switch (relay) [5], control serial communication via RS232[7],

process signals from the sensor block [4], and encode and decode for the RF link [3]

This block is similarly to the block of the main circuit, but there is no switch block

circuit. We can use this circuit independently with the main circuit, and the structure

of the sensor block (*) may be changed to connect with different sensors

1.2 The most simple connection model

MicrocontrollerPIC16F877

RS232

LCD display

Power

Relay block

[3] Receive RF block

PC/Main

circuit

(*) Sensor block(thermal, pH)

Extension

circuit

Phone


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Center PC connects with a cell phone (Home Mobile). Home Mobile will send

message containing commands (SMS) to Remote Mobile. Remote Mobile is a cell

phone connected with the board having sensors. This board collects parameters from

sensor, then transfers to Remote Mobile and Remote Mobile sends SMS containing

these parameters to Home Mobile. At home, Center PC reads SMS from Home

Mobile and processes data.

Center PC HomeMobile

RemoteMobile

Sensor

Cell phone network


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1.3 The model connection with extended circuit using transmitter and receiver RFmodules or RS232

The blocks Extended Remote Sensor1 and Extended Remote Sensor2 are

extended blocks to enlarge the system. The details of RF link and RS232 link (UART

link) will be presented in Part IV.

Data from sensors in the block [1], [2], [3] will be send to center by remote mobile.

The SMS message received at Home Mobile will be processed by PC (storage and

graph)

Remote CenterSensor [1]

Extended

RemoteSensor1 [3]

PC

Remote mobile

Home Mobile

Extended Remotesensor2 [2]

RF

RS232


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1.4Model connection for collecting data from remote sensor using internet

Target of this model: Saving cost for region which have internet

1.5 Replaced model for remote region while dont have internet, but covered bymobile network

HomePC

Internet

Remote PC

RemoteCenterSensor

ExtendedRemoteSensor1


Mobile

GPRS

HomePC

Internet

Remote PC RemoteCenterSensor


Extended

RemoteSensor2

RS232

RS232

RS232


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This model using GPRS (2G) network for connection sensors from remote area to

center

II. Algorithms for programming microcontroller in the board (center

board and extension board)

2.1 Center Board

We use model connection in section 1.4 for programming microcontroller in center

board (Because this is the most complicated model connection)

Start

Have RFsignal?

Save receivedcharacters to

RF buffer

Process UARTbuffer [a], anddelete it

RF frame is

completed?

-Process RFbuffer[b]And delete it

No

No

Yes

Yes


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Processing data in buffer RF (block [b]), buffer UART (block [a]).It means detach

data bytes in them, and save to third Buffer. After that waiting for certain time, or

trigger event caused by center (such as calling signal or arrival message signal from

center), to transmit data in that buffer to center by SMS

2.2 Extended circuit for main circuit

III. Protocols for connecting cell phone to PC or microcontroller

We use two types of protocol in this thesis, AT command and FBUS

protocol

Collecting datafrom sensors andsave to buffer

Havetrigger

event?

Send data in buffer toBoard center (center circuit)

Start

Yes

No


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3.1 AT command

3.1.1 Some single AT commands used in communication with the cell phone

at+cbc? Get information about the pin status, to know when to cover the pin

at+gmm? Get information about your phone model, to select the appropriate AT

command set

at+cgmi? Get information about devices manufacturer

at+csq? Get information about the strength interference

at+cusd=1,"*101#" Get information about the amount in the account of SIM, for

the should recharge the SIM

at+csca? Retrieved number message center, used to sending message process

at+cpbr=1,25 Used to read the telephone directory from 1 to position 25

3.1.2 The combination of AT commands

- Combination of AT commands to read the last message in the device

at+cpms=me After this command we know the number of messages (X) have in the

phone

at+cmgf=1 Specify the message read in text format ( at+cmgf=0, PDU format)

at+cmgr=X After this command we have the last message in the device

Sample

at+cpms="me"

+CPMS: 18,70,7,30,18,70

OK

at+cmgf=1

OK

at+cmgr=18

+CMGR: "REC READ","+84936975464","MrChick","09/05/01,10:13:13+28"

Test doc noi dung tin nhanOK

- Combination of commands to help read all messages

at+cpms="me show out memory to read data is the device memory

(at+cpms="sm show out memory to read data is the SIM memory)

at+cmgf=1 Specify the message read in text format

at+cmgl="all Read all messages in the memory

- Combination of command to help read the message received from device


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at+cnmi=2,1,0,0,0 Setting up the report when the message send to device

When a message come to device, the phone will output to COM port the following

text string

+CMTI: "ME",60

This string show that the message is saved in the position 60 in the phone (ME)

Similarly, if messages stored in SIM in position 60, the string returns form

+CMTI: "SM",60

Then we need to output the combination of the following to read the message in

text format

at+cpms=me

at+cmgf=1

at+cmgr=60

- Combination of command to delete message in the phone

Command delete messages in the position X in the device memory or SIM

memory

at+cpms=me (SIM memory: at+cpms=sm)

at+cmgd=X

3.2 FBUS protocol

3.2.1 General about FBUS protocol

The FBUS protocol is used in communication between phone and PC. We can also

use FBUS for communication between phone and microcontroller. FBUS bases in

packets for error control and management.

FBUS parameters

Speed: 115,200 bpsBits: 8

Parity: None

Stop Bits: 1

3.2.2 General structure of a command in FBUS

1e: cable


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S: source address

D: destination address

00: pc/ microcontroller address

0c: phone address

type: command type

len: number of octet from len to sq

body: content of command

sq: sequence packet number

0? Padding, iflen is odd, octet 00 is added to frame

chk: checksum,, for checking error, 2 byte

3.2.3 Command from PC to phone, request send an SMS message to

3.2.4 Structure of ACK command from phone to PC

Type: type command of command needed to ack

IV. Details of the links in the system

4.1 UART connection

Circuit of conversion voltage level for connecting PC & Microcontroller


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Programming to establish communication between the controller and the computer is

important. The purpose is to transmit and receive command strings from PC to

microcontroller or from microcontroller to microcontroller

We use the following diagram for establish protocol communication

Detail of UART communication

Text string is transmitted to ASCII characters. Start a chain of characters #, and

ended the series as characters *

To ease the process of communication between the computer-PIC, and PIC-PIC, we

defined a set of commands

PIC is always in the status of pending orders from the PC. When it receives the string

text from PC, it will split the command based on the characters ' # 'and' * '. After

separating out each command, PIC will in turn implement the commands

#ping* Use ping to check connection between circuits

PC CENTER

TERMINAL1 TERMINAL2

UARTUART

UART


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#1r1n* Use 1r1n to enable relay1 in TERMINAL1#1r2n* Use 1r1n to enable relay2 in TERMINAL1

#1r1f* Use 1r1f to disable relay1 in TERMINAL1


#1the* Request terminal1 send data about temperature to CENTER

#1r1s* Request TERMINAL1 send status of relay1 to CENTER


#2r1n* Use 2r1n to enable relay1 in TERMINAL2#2r2n* Use 2r1n to enable relay2 in TERMINAL2


#2r2f* Use 2r2f to disable relay2 in TERMINAL2#2the* Request terminal1 send data about temperature to CENTER



Algorithm for processing string in center board, and terminal board


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Len: length of buffer

Start=1: allowed to save characters to receive buffer

Start=0: not allowed to save characters to receive buffer

4.2 RF connectton

4.2.1 Using transmitter and receiver RF module to make RF connection

Receivecharacter C

C=#

Start=1Len=0

C=*=

-Buffer[len]=C-Len=len+1

-Output to lcd display-Process command inbuffer-Len=0

Yes No

NoYes

Have characterscome to COMport?

Yes

No

Start


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Figure 2 Transmitter RF module

Circuit for connecting to these modules

Figure 3 Connect to receiver module

Figure 1 Receiver RF module


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Figure 4 Connect to transmitter module

4.2.2 Programming to communicate in RF link

Two important parts in this session are:

-Transmit one byte (8 bits)

-Transmit many bytes (Frame)

Structure of one byte

Structure of one frame

Synchronize string

Start byte Bit1

Bit2

Bit3

Bit4

Bit5

Bit6

Bit7

Bit8

Time

Amplitude


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ProgrammingTransmitter

- Transmit a byte

void truyen1(unsigned int8 x)

{

int i=0;

for(i=0;i


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for(i=0;i


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if(i==4) tong=tong+16;




}

}

The varible tong content data byte

Algorithm helps decoding a frame (a frame consists of many of byte data)

if(tong=='#')

{luu_buffer=1;vi_tri_buffer=0;do_dai_buffer=0;}

if(tong=='*') luu_buffer=0;

if((luu_buffer==1) && (tong!='#')){

buffer_rf[vi_tri_buffer]=tong;

vi_tri_buffer++;

do_dai_buffer++;

}

else{

if(tong!='#'){

break;

}

}

4.3 Internet connection

SocketIntroduction

Socket interface is a programming application (API-Application Programming

Interface). It introduced the first edition of UNIX - BSD 4.2. as the system function

syntax language C (socket (), bind (), connect (), send (), receive (), read (), write (),

close () ,..). Today, Socket supported in most operating systems such as MS Windows,

Linux and used in many programming languages different as C, C + +, Java, Visual

Basic, Visual C


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Socket set allows the communication channel that two channels are marked by

two ports (port). Through this process one can receive and send data to the other.

Port number

To be able to make the communication, one process must declare number of

socket you use. Each port can communicate at an address specified in the system.

When the process is assigned a port number, it can receive data sent to this port from

the other. Process the remaining is also required to create a socket.Besides the port number, the two sides must also communicate the IP address of

each other. IP Address distinction between this computer with other computers on the

network TCP / IP. In the port number used to distinguish the different processes on

the same computer.


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Realization

We designed software to connect Center PC to Remote PC. This software is

written from Visual Basic (VB) and used socket to build a client server system. VB

provide us a component, which has function as socket, is Winsock (mswinsck.ocx).

After we have setup this program on 2 PC (1 center PC and 1 remote PC), we must

put in program one port number (here is 1221) and IP for each PC. The program on

center PC is designed to send control commands (messages) to remote PC after

connecting successfully. The program on remote PC will receive commands and

transfer it to COM port (RS232). The board connects to remote PC through COM port

will receive and perform these commands. The data from sensor or device will be

transmitted to the board, then is sent to remote PC. Remote PC continues to send this

data to center PC processing.

Yahoo Messenger

Introduction

Yahoo Messenger (YM) is an application connection to exchange data between

two PC through Internet. This is software widely used in Vietnam. Although not an

open source software entirely but Yahoo Server allows you to connect directly with it

to transmit information, the data to a YM any use Port 5050 and the Host Server

(cs101.msg. yahoo.com, scs.msg.yahoo.com ,...) that always guarantee the stability,


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Center PC

Remote PC

Board

Yahoo Server

security, and especially the speed of transfers is very high, almost real. So we can

completely write an application based Yahoo Server to create a connection between

PC and controls, control devices remotely.

We use Yahoo server to connect Center PC to Remote PC. Center PC send

commands to Remote PC via Yahoo Messenger. After receiving command of Center

PC, Remote PC (has a program, written by VB, control and manage device directly)

send those commands to board connected to PC and transfer data to Center PC.

Protocol : 0-sckTCPProtocol

Remote Host : scs.msg.yahoo.com

Remote Port : 5050

Realization

Yahoo Messenger (YM) provides open sources to connect with Yahoo Serverlike YSMG versions (8 to 16). When using this program, we can transmit data

between 2 PC easily. We designed a software using open source of YM put in each

PC (center PC and remote PC). This is important code used to connect Yahoo Server:

Private Sub sckMain_Connect()

Dim ByteArray1() As Byte

Dim ByteArray2() As ByteDim str As String


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On Error GoTo ErrorRaised

FunctionMadeError = "sckMain_Connect"

SentPacket.Service(1) = 0

SentPacket.Service(2) = Asc("L") '=&H4C

SentPacket.Status(1) = 0




SentPacket.SessionID(1) = 0




SentPacket.Data = ""

ConvertYmsgType2ByteArray SentPacket, ByteArray1

sckMain.SendData ByteArray1

'----------------------Next---------------

DoEvents 'This line is realy important due to some mswinsock bug!

SentPacket.Service(1) = 0

SentPacket.Service(2) = YAHOO_SERVICE_AUTH




SentPacket.Status(4) = YAHOO_STATUS_AVAILABLE





SentPacket.Data = "1" + Separator + txtUser.Text + Separator

ConvertYmsgType2ByteArray SentPacket, ByteArray2

sckMain.SendData ByteArray2

Exit Sub

ErrorRaised:

ErrorHandler

End Sub


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However, this software not only be used to send/ receive data, but it is also

improved to process command and connect to the board. The synchronous speed is

115200 bps. In addition, we only setup this program on remote PC, then we can use

Yahoo Messenger program on some PC to connect to remote PC and send device

control command. To do that, we open a chat window from YM and send a message

which contains standard control commands (ex: D01: ON#, Reload#...) to Yahoo id

signed in to program put in remote PC.

Website

We can use website from some PC everywhere to control devices connectedwith remote fix PC. To realize this idea, we designed a website which is written by

PHP language. In addition, PHP language provides us a function to connect PC to

Board though RS232. So we can send control commands directly from website to

board. This is important code to connect to board.


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V. RESULT & DISCUSS

5.1 Some image of Data management and processing program

Figure 5 Management software system


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Figure 6 Management with Yahoo

Figure 7 Data collection and control devices through the Yahoo


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Figure 8 Management with SMS

.

Figure 9 Collect data by SMS


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Figure 10 Some functions of the software

Figure 11 Observed data as graphs


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Figure 12 Installation parameters for software

5.2 Some image of website for Control and monitor devices

Figure 13 Log in using the web interface


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Figure 14 Control equipment

Figure 15 Monitoring of environmental parameters

5.3 Some images of prototype board


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Figure 16 The board connections and mobile devices

Figure 17 Terminal Board 1


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Figure 18 Terminal Board 2

Figure 19 Center Board

5.4 Some images of debugging software


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Figure 20 Control interface FBUS connection

Figure 21 Control interface COM connection


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REFERENCE

[1] RAHUL P. et al (2007). A Novel Approach to Remote Sensing and Control. The

6th WSEAS Int. Conf. on Electronics, Hardware and Optical communication, Corfu

Island, Greece

[2] Sony Ericsson. (2003). AT Commands Online Reference T68, T68i, T300, T310,

T610, Z600, T230, T238, T226, T630

Website :

http://www.embedtronics.com/nokia/fbus.html

http://www.edaboard.com/ftopic264676.html

http://discussion.forum.nokia.com/forum/showthread.php?t=72056

http://www.8051projects.net/microcontroller-tutorials/

http://www.panuworld.net/nuukiaworld/hardware/cables/fbus.htm

http://www.picvietnam.com/forum/showthread.php?t=2234

http://www.serasidis.gr/circuits/smscontrol/smscontroller.htm

http://www.developershome.com/sms/

http://www.edaboard.com/ftopic70001.htmlhttp://www.activexperts.com/xmstoolkit/atcommands/dtmf/

http://www.edaboard.com/topic293431.html


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Table of content

Abstract ............................................................................................................................... 2I .Circuit block and model connection................................................................................ 2

1.1 Main circuit block diagram........................................................................................ 2

1.2 The most simple connection model ........................................................................... 31.3 The model connection with extended circuit using transmitter and receiverRF modules or RS232...................................................................................................... 51.4 Model connection for collecting data from remote sensor using internet ................. 61.5 Replaced model for remote region while dont have internet, but covered by

mobile network ................................................................................................................ 6II. Algorithms for programming microcontroller in the board (center board andextension board) .................................................................................................................. 7

2.1 Center Board .............................................................................................................. 72.2 Extended circuit for main circuit ............................................................................... 8

III. Protocols for connecting cell phone to PC or microcontroller ..................................... 8

3.1 AT command ............................................................................................................. 93.2 FBUS protocol ......................................................................................................... 10

IV. Details of the links in the system................................................................................ 114.1 UART connection .................................................................................................... 114.2 RF connectton ......................................................................................................... 144.3 Internet connection................................................................................................... 19

V. RESULT & DISCUSS ................................................................................................ 255.1 Some image of Data management and processing program.................................... 255.2 Some image of website for Control and monitor devices........................................ 295.3 Some images of prototype board ............................................................................. 305.4 Some images of debugging software ...................................................................... 32

REFERENCE.................................................................................................................... 34

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