United Arab Emirates University College of Engineering Electrical Department Graduation Project (II) - ELEC 590

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United Arab Emirates UniversityCollege of
EngineeringElectrical Department Graduation
Project (II) - ELEC 590
Wireless Intercom (Range U.A.E)
Advisors Name Dr. Qurban Ali
Students Names ID Numbers Abeer M.Al
Naimi 200105311 Arwa Abdul Qader
199904138 Halima Abdulla Al Har
200105207 Yousra Abu-Baker Al Siddig
200107215
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Outlines

• Introduction Design Description.
• Objectives.
• System Operation Details.
• Microcontroller Programming.
• Software Hardware Testing.
• Health, Safety Environment Issues.
• Conclusions Recommendations.

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Wireless Doorbell Intercom System
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Objectives

• Providing wireless communication bridge between
  mobile phone and intercom.
• Implementing wireless doorbell intercom system
• Construct and integrate system modules.
• deal with the necessary controlling software
• troubleshoot any problems within development and
  construction phase.

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Work Strategy

• Graduation project I
• Specifying the design.
• Choosing the design parts and components
• Studying the theory of wireless communications
• Studying the microcontroller
• Studying different system interfaces
• Graduation project II
• Writing the software program for the
  microcontroller
• Implementing the hardware connections.
• Testing Debugging of the integrated system.

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System Operation Details

• System Flow Chart.
• System Block Diagram Activities.

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System Block Diagram
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Block Diagram Activities
Activity Number
Press the button. 1
Detection of the pressed button. 2
Enable/ disable dialing. 3
Dial the stored number. 4
Mobile state (Busy / Switch off). 5
Play message on intercom. 6
Owner's mobile phone rings. 7
Enable/disable voice communication. 8
Voice communication. 9
Door key decision. 10
Press key "A". 11
Press key "B". 12
Detect key "B" and release door latch. 13
Disconnect the call. 14
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PIN Diagram System Main Components
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Pin Diagram
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System Main Components

• Doorbell Intercom
• GSM Mobile phone
• Microcontroller
• GM29 Wireless Modem
• Power Supply
• Max 232
• DTMF

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Doorbell Intercom

• What is an intercom?
• What is a Doorbell Intercom?
• Product Used

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KOCOM INTERCOM
Specification Item
KOCOM Korea Communications Company Company
DP-306H Model
AC 110/220 V 50/60Hz Used Power
1 Melody Signal Sound
050 oC Assurance Temperature
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Microcontroller

• What is Microcontroller?
• Why is it used?
• What type of Microcontroller is used in our
  project?

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Wireless Modem

• What is the Wireless Modem?
• Why is it used?
• What is the modem chosen for the project?

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GM 29 Sony Ericsson Wireless Modem
Sub-D socket, 9 pin (RS232 serial port)
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MAX 232

• A full duplex dual driver/receiver chip

• Reduces the RS232 voltage to 5V

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MAX 232 Pin Diagram
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MAX 232 CONNECTION
No. Name Purpose Connected to
1 C1 connector for capacitor C1 ve end of a 1 µF capacitor
2 Vs output of voltage pump 1 µF capacitor which is connected to a 5V from a side and parallel to an other 1 µF from the other side.
3 C1- - connector for capacitor C1 -ve end of the 1 µF which is connected to C1
4 C2 connector for capacitor C2 ve end of a 1 µF capacitor
5 C2- - connector for capacitor C2 -ve end of the 1 µF which is connected to C1
6 Vs- output of voltage pump / inverter 1 µF capacitor which is connected to an inverter.
7 T2out Driver 2 output -
8 R2in Receiver 2 input -
9 R2out Receiver 2 output -
10 T2in Driver 2 input -
11 T1in Driver 1 input RB7 pin of the 16F876 Microchip
12 R1out Receiver 1 output RB6 pin of the 16F876 Microchip
13 R1in Receiver 1 input Pin 3 of the DB9 side of the RS232 cable
14 T1out Driver 1 output Pin 2 of the DB9 side of the RS232 cable
15 GND Ground Ground
16 VCC Power supply 5V power supply.
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DTMF

• What does DTMF stand for?
• Why is it used?
• What kind of DTMF was chosen for our project??

MC145436AP
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DTMF Frequency band
High-Group Frequencies High-Group Frequencies High-Group Frequencies High-Group Frequencies
1633 Hz 1477 Hz 1336 Hz 1209 Hz
A DEF 3 ABC 2 1 697 Hz Low-Group Frequencies
B MNO 6 JKL 5 GHI 4 770 Hz Low-Group Frequencies
C WXY 9 TUV 8 PRS 7 852 Hz Low-Group Frequencies
D OPER 0 941 Hz Low-Group Frequencies
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DTMF Connection
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Power Supply Design

• The voltage required for IC is 5 V.
• The designed power supply provides a variable
  output DC voltage ranging from 0-15V with a
  voltage ripple 100 mV.

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Power Supply Components

• Transformer
• Rectifier
• Potentiometer

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Continue

• LM317 Regulator
• A regulator converts varying input voltage and
  produces a constant "regulated" output voltage.

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LM317 Regulator Circuit
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Power Supply Circuit
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Power Supply Design Calculations

• To calculate the output voltage of the
  transformer, the input voltage to the rectifier
  was calculated.

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Continue..

• To calculate the value of the filter capacitor

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Continue

• R load was calculated as follows

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Final Power Supply
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GSM Mobile Phone

• What is the GSM Mobile Phone?
• Why is it used in this project?

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Microcontroller Programming

• Software Processes
• PIC Basic Pro Compiler
• How PBC works
• Sample Code for testing
• Implementation issues
• Completed Program

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Software Processes

• According to the software specifications planned
  for this project, the following functions were
  taken into consideration
• Connection
• Modem Initialization.
• Establishing communication between voice
  handling device and the mobile phone.
• On board device at home (controller)
• Dialing the stored number.
• Deciding mobile phone state (Busy/Switch off).
• Playing message.
• Detecting key 'B' and releasing door-latch.
• Disconnecting the call.

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PICBasic Compiler Pro

• First computer module based on BASIC language
  (1995).
• PBASIC used EEPROM (Electrical Erasable
  Programmable Read Only Memory).
• PicBasic (PBC)
• - faster.
• - limitation.

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How PBC Works

• The PBC are a batch of short little assembly
  language program written to do certain tasks.
• When the compiler is run, it groups those little
  programs together according to the PBC program
  structure.

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PICBasic Pro Compiler Sample Code for testing

• Scrolling LED Project

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Scrolling LED Program
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Implementation Issues

• Dialing the number
• Mobile State
• Releasing the door latch

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Dialing Function Code

• Dial
• High TXD
• HSerout"AT" Check the modem status
• Low TXD
• Pause 1000
• High TXD
• HSerout"ATD0507532112" Store the number
• Low TXD
• Pause 1000
• High TXD
• HSerout"ATDME0507532112" Dial the stored
  number
• Low TDX
• Pause 1000
• Return

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Mobile State Function code
me
HIGH TXD HSEROUT "ATX2" ' busy line LOW
TXD PAUSE 2 IF HIGH RXD THEN HSERIN
500,ME,wait("OK") GOSUB msg ELSE HIGH TXD
HSEROUT"ATH" TXD0 RETURN
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msg
RXD0 High PORTB.0 Sound PORTB.0,dur,freq
'play msg on intercom Pause 6000 Low
PORTB.0 Return
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Releasing the door latch Function Code

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Completed Program
DEFINE LOADER_USED1 'only required if
bootloader is used to program PIC DEFINE
HSER_RCSTA 18h 'set recieve register to
receiver enabled DEFINE HSER_TXSTA 98h 'set
transmit register to transmitter enabled DEFINE
HSER_BAUD 9600 'set baud rate DEFINE
HSER_SPBRG 99h 'set SPBRG directly DEFINE
HSER_CLROERR 1 INCLUDE "modedefs.bas" init TRI
SA111000 ' set port A
status TRISB10000010 ' set port
B status PORTA000000 ' initial
state of port A PORTB00000000 '
initial state of port B TXD VAR
PORTB.6 ' Transmit to modem
RXD VAR PORTB.7 ' Recieve from
modem freq VAR WORD dur VAR
WORD Lock VAR PORTB.4
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Completed Program
main GoSub Dial freq4000 dur7000 GoSub
ME GoSub latch End Dial High TXD HSerout"AT"
'Initialize the Modem Low TXD Pause
2000 High TXD HSerout"ATD0507532112"
'Store number Low TXD Pause 2000 High
TXD HSerout"ATDME0507532112" 'Dial the
stored number Low TXD Pause 2000 Return
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Completed Program
Pause 2000 Pause 2000 Return ME High
TXD HSerout"ATX2" ' busy line Low
TXD Pause 2 HSerin 500,ME,wait("OK") IF RXD1
Then GoSub msg Else High TXD HSerout "ATH"
Low TXD Pause 2000 EndIF Return msg Low
RXD High PORTB.0 Sound PORTB.0,dur,freq
'play msg on intercom Pause 6000 Low
PORTB.0 Return
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Completed Program
latch DTMFOut PORTB.1,2 IF PORTB.1 Then High
Lock Else Low Lock End IF Return
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Mobile to Microcontroller
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Microcontroller to Modem
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Microcontroller to Intercom
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Health, Safety Environment Issues

• Metal parts should be removed when switching on
  the system.
• The device (to be installed) inside the house
  should be installed at a location that is not
  reachable by a child to avoid electricity
  contact, and setting of the switch in the away
  mode this would unnecessarily connect to mobile
  phone while owner is in the house.

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Health, Safety Environment Issues

• If possible, the device inside the house should
  be housed in safe cover.
• The frequencies used by the system are GSM
  signals, and are considered safe in the public
  domain.

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Conclusion

• The aim is to implement a wireless intercom which
  communicate within the range of UAE.
• Increase the system mobility and easy to use.
• Provided us with the opportunity to learn and
  gain experience in many fields.
• Work with different standards instead of GSM
  standard only, such as GPRS, UMTS, etc.

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References

• Intercom, http//www.answers.com/library/Wikipedia
  -cid-965636858, (20/2/2006).
• What is a Microcontroller, http//www.wisegeek.com
  /what-is-a-microcontroller.htm, (18/4/2006).
• Code Loader Program, theByteFactory,
  http//www.thebytefactory.com/, (23/4/2006)
• PIC16F876 Microcontroller, Futurlec,
  http//www.futurlec.com/Microchip/PIC16F876.shtml,
  (23/4/2006)
• http//www.kmitl.ac.th/kswichit/MAX232/MAX232.htm
  
• http//www.datasheetcatalog.com/datasheets_pdf/M/A
  /X/2/MAX232.shtml
• http//nemesis.lonestar.org/reference/telecom/sign
  aling/dtmf.html
• http//innovexpo.itee.uq.edu.au/2003/exhibits/s400
  7360/

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Thank you for listening
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Any Questions???