Device Control Using GSM Mobile Phone Project Electronics

Department of Electronics & Communicat Communication. ion.

Year -2011

Table of Content

1. Project Introduction 2. Literature Review 3. Project Plan 3.1 Problem Statement 3.2 Operating Environment 3.3 Intended Users & Uses 3.4 Assumptions 4. Proposed Approach 4.1 Functional Requirements 4.2 Constraint Considerations 4.3 Technology Considerations 4.4 Technical Approach 5. Testing Requirements 5.1 GSM Receiver 5.2 GSM to Microcontroller 5.3 Decoding of Remote User’s User ’s commands 5.4 I/O Command’s Voltage 5.5 I/O Command Storage 5.6 Circuit’s Power Surge Protection 5.7 End Product Functionalities 6. System Block diagram 7. Circuit Diagram 7.1 Circuit Diagram 7.2 Power Supply Section 7.3 Relays 8. PCB Layout 9. Microcontroller Programming 10. Component List

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Department of Electronics & Communicat Communication. ion.

Year -2011

11. Component Description 11.1 Resistors -------------------------------------------18 11.2 Capacitors -------------------------------------------19 11.3 LED -------------------------------------------19 11.4 Transistors -------------------------------------------20 11.5 Transformer -------------------------------------------21 11.6 Diodes -------------------------------------------22 11.7 Relay -------------------------------------------22 11.8 Microcontroller ATtiny2313 11.8.1 Features -------------------------------------------23 11.8.2 Pin Out -------------------------------------------------------------------------24 ------------24 11.8.3 Block Diagram -------------------------------------------------------------------------------25 ------25 11.9 DTMF Decoder MT8870 11.9.1 Description & Features ---------------------------------------------------------------------------26 ----------26 11.9.2 Pin Out Description ---------------------------------------------------------------------------27 ----------27 11.10 ULN 2003 IC -------------------------------------------------------------------------------28 ------28 11.11 Voltage Regulator Regulator IC MC7812 & LM7805 --------------------------------------------------------------------------2 -----------299 11.12 Diode IN4007 ------------------------------------------------------------------------------30 -------30 12. PCB Manufacturing Process ------------------------------------------------------------------------31 -------------31 13. Design Specification 13.1 PCB Designing -------------------------------------------------------------------------------33 ------33 13.2 LAYOUT Design ------------------------------------------------------------------------------34 -------34 13.3 Etching Process ----------------------------------------------------------------------------35 ---------35 13.4 Component Assembly ----------------------------------------------------------------------------36 ---------36 13.5 Soldering -------------------------------------------38 14. Working -------------------------------------------39 15. Application -------------------------------------------40 16. Chronology --------------------------------------------41















Department of Electronics & Communication Communication..

1.

Year -2011

PROJECT INTRODUCTION

Our project Device Control Using GSM Mobile Phone is a setup or system in which we can easily ON/OFF the appliances using in home. The appliances are connected through a circuit which is connected to a GSM mobile phone via a DTMF Tone Decoder IC. It often happens that we forget to switch off some electric devices while leaving home for a journey. This will result in wastage of energy and even the device may get damaged due to overheating. Even if we remember that we have not switched off some devices, it may be difficult for us to come back and switch them off. Also, if we are away from home we may have to turn on the lights at night. These are normally not possible in present condition. Our project offers a novel solution for this problem by using a GSM mobile phone, a common electronic gadget. This device is build around PSoC, a powerful system-on-chip. This uses DTMF (Dual Tone Multi Frequency) signals from mobile phone keypad to attain its functionality. For decoding the DTMF tones, we are using MT8870, CMOS Integrated DTMF Receiver. FEATURES The main features of our device control system are:-

Easy control of devices through mobile phone Can control (on/off) a maximum of 8 devices (by using decoder we can increase this number to 256)
















2.

Year -2011

Literature Review

Smart home is one of the recent fields in the context of computer science. The paper named as “Remote mobile control of home appliances” by F. Meija, M. Nikolova and P. Voorwinden depicts on the home controlling using WAP protocol. The architecture mentioned by them is much complex but it gives an initial idea about the remote home appliance controlling. Smart home studies sometimes affected by the concern about the possible harms to the th e humans’ health. A great research was done by Toril Laberg, Directorate for Health and Social Affairs of the Delta Centre, Norway. He later publish in his paper named “Smart Home Technology: Technology supporting independent living - does it have an impact on health?” that there is no harm on humans’ health by the technical setup required to support smart home technologies. te chnologies. Scott Davidoff, Min Kyung Lee, Charles Yiu, John Zimmerman, and Anind K. Dey in their journal named “Principles of Smart Home Control” describe the control that families want and suggest seven design principles that will help end-user programming systems deliver that control. Tatsuya Yamazaki in his journal “The Ubiquitous Home” suggests that automation should not become a goal of the smart home technologies. In this paper he represents a real-life test bed, called the Ubiquitous Home. In the Ubiquitous Home, a robot plays a role of interface for the residents. Three kinds of context-aware services have been implemented and a real-life living experiment was conducted. The
















Year -2011

Recently some projects are organized for building the architecture of controlling home home appliance using voice commands. VoiceXML Voi ceXML is used for that purpose. A smart house system named NETVOX [18] based on the ZigBee standard is introduced recently. The system can use for home automation and industrial controls. It provides security, temperature, humidity, lighting, sensor, and multimedia control for comfort, convenience, and safety wirelessly. The system may be accessed and controlled over the telephone or over the Internet.
















3.

Year -2011

Project Plan

This section will state the basic problem, and the basic characteristics of the project, such as operating environment, environment, users, etc . 3.1 Problem Statement

The objective of this project is to develop a device that allows for a user to remotely control multiple home appliances using a cellular phone. This system will be a powerful and flexible tool that will offer this service at any time, and from anywhere with the constraints of the technologies being applied. Possible target appliances include (but are not limited to) climate control systems, security systems, and lights; anything with an electrical interface. The proposed approach for designing this system is to implement a microcontroller-based control module that receives its instructions and commands from a cellular phone over the GSM network. The microcontroller then will carry out the issued commands. 3.2 Operating Environmen Environmentt

The control system will include two separate units: the cellular phone, and the receiving control unit. There will therefore be two operating environments. The cellular phone will operate indoors and outdoors whereas the receiving control unit will operate indoors within the temperature and humidity limits for proper operation of the hardware.


















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3.3 Intended Users and Uses

This product is aimed toward average consumers who wish to control household appliances remotely from their cell phones provided that the appliances are electrically controllable. controllable. Example of of feasible appliances appliances and applications under consideration include; enable/disable security systems, fans, lights, kitchen appliances, and a heating/ventilation/air conditioning system. 3.4 Assumptions

The following is a list of assumptions for the project:1. The user and receiver control unit will establish communication via GSM. 2. The cell phone and service provider chosen will support calling service. 3. The user is familiar with the call process & IVRS on cell phone. 4. All service charges from service provider apply. 5. The controlled appliances will have to have an electrical interface in order to be controlled by microcontroller.


















4.

Year -2011

Proposed approach

This section outlines the criteria that will be considered in the development of the control system. 4.1 Functional Requirements The following is a list of functional requirements of the control unit/module. The Cellular Unit will have the ability to connect to the cellular network automatically. automatically. The Cellular Unit will be able to receive call and will be able to send DTMF tone to the DTMF Decoder IC. The DTMF Decoder IC will decode the (pressed no. by user’s cell phone & received on Cellular Unit) DTMF tone into the 4bit BCD output signal. The microcontroller connected to the DTMF decoder IC will receive the BCD output. The logic programmed in microcontroller drive the signal to the O/P ports of microcontroller as per the BCD O/P. Microcontroller will issue its command to the electrical appliances through a simple control circuit.

4.2 Constraint Considerations The following is a list of constraint considerations:-


















Year -2011

4.3 Technology Considerations The considerations for this system will include a choice of networks,

communication communication protocols, and interfaces. 1) Cellular Networks: The widely available networks are based based on on GSM. This network provides a wide area of coverage and can be utilized more cost-effectively for this project. Communication protocols : The available communication protocols 2) Communication are DTMF, DTMF, GPRS and and SMS. SMS. The DTMF DTMF is the most efficient because this project requires a cellular communication and only by pressing keys we can control appliances. 3) I/O interfaces between microcontroller and devices : Serial or parallel I/O will be considered as options for connection between between the GSM receiver and the microcontroller. microcontroller. Using the microcontroller, microcontroller, a control circuit will be implemented to control the electrical appliances. 4.4 Technical Approach Assuming that the control unit is powered and operating properly, the process of controlling a home device will proceed through the following steps:The remote user makes a call to the GSM cellular unit and commands to the receiver. GSM receiver receives call automatically from user cell phone by auto answering mode. After receiving call by GSM cellular unit user press the keys on his cell phone.


















5.

Year -2011

Testing Requirements

The following testing requirements will be indicators that the system can successfully be implemented. implemented. 1) The GSM receiver will be tested for successful communication with network. This will test include automation and consistency of the connection and will be conducted by team members in the following way: The cellular phone will dial the GSM receivers’ number. numb er. Once the connection is established a stream of data will be send to the GSM receiver. The GSM receiver will be given data to be transmitted to the cellular phone.

Success/Failure criteria: The data received will be observed on both ends to verify its consistency. The test will be considered successful if the integrity of the sent and received data is maintained upstream. It will be considered a failure otherwise. 2) The GSM to microcontroller driver will be tested by verifying the integrity of command strings sent from the remote user. The following procedure will be performed by team members for this phase:

The remote user will send a command to the control module. The contents of the data stream will be observed at the GSM communication communication port.


















Year -2011

3) Proper decoding of the remote user’s commands and issuance of the equivalent commands to the controlled device will be performed by team members using the following procedure:

A simulated instruction will be fed to the microcontroller communication communication port. The output command at the I/O interface with the corresponding controlled device will be observed. Success/Failure criteria: The test will be considered a success if the resulting command issued from the microcontroller is sent to the right I/O address for the desired controlled device and if that command is consistent with the command which is expected. The test will be considered a failure otherwise.

4) The I/O command’s voltage will be tested to meet the levels required to actuate the individual devices. The following procedure will be performed by team members:

A simulated command from the microcontroller will be written to its I/O port. The output voltage at the desired device’s control interface will be measured to verify its strength. Success/Failure criteria: The test will be considered successful if the simulated command from the microcontroller causes the proper voltage to be observed at the desired device’s control interface.




















Year -2011

6) The circuit’s power surge protection will be tested for acceptable performance by EE team members using the following procedure:

The circuit’s power supply will be removed from the circuit and connected to a dummy load. A simulated voltage spike will be inputted by using a step signal from a signal generator. The output voltage and current will be measured at the load. Success/Failure criteria: The success of the test will be determined by verifying that the output signal to the dummy load falls with the tolerance indicated by the microcontroller and the t he GSM chip’s manufacturers. The test will be considered a failure if the measured characteristics of the power supply’s output do not meet the manufacturers’ requirements.

7) The end-product functionalities will be tested by team members and non-team members in the following way:




















6.

Year -2011

System Block Diagram

The block diagram of the system is given below:

Receiving Cell Phone

RELAY1

DEVICE1

RELAY2

DEVICE 2

RELAY3

DEVICE3

Unit

ATtiny2313 Microcontroller




















7.

CIRCUIT DIAGRAM

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POWER SUPPLY SECTION

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RELAYS

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PCB LAYOUT




















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Year -2011

Microcontroller Programming

ATtiny2313 is programmed by the BASECOM-AVR IDE [1.11.9.5]. We have used this Integrated Development Environment Software for program the 4 bit input coming into microcontroller microcontroller to drive the appropriate relays.

LOGIC The basic logic used that configure the IC MT8870 through making the port D as input. The 4 bit BCD input taken from PinD0, PinD1, PinD3, PinD4. The O/P port is PORTB to drive the relays are port pins PORTB 1 PORTB 7.




















10.

Year -2011

COMPONENT LIST

Component Name GSM Mobile Phone Transformer [0-15V, 750mA] Microcontroller IC ATtiny2313 DTMF Decoder IC Driver IC ULN2003 Regulating IC MC7812 Regulating IC LM7805 Relays [SPDT, 12V]

Quantity 1 1 1 1 1 1 1 7

Price(Amount) `1000 `190 `150 `38 `35 `20 `18 `126




















Year -2011

COMPONENT DESCRIPTION

11. 11.1 RESISTORS: -

A Resistor is a heat-dissipating element and in the electronic circuits it is mostly used for either controlling the current in the circuit or developing a voltage drop across it, which could be utilized for many applications. There are various types of resistors, which can be classified according to a number of factors depending upon:




















Year -2011

11.2 CAPACITORS

The fundamental relation for the capacitance between two flat plates separated by a dielectric material is given by:C=0.08854KA/D Where: C= capacitance in pf. K= dielectric constant A=Area per plate in square cm.






















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11.4 TRANSISTOR: -

A transistor consists of two junctions formed by sandwiching either ptype or n-type semiconductor between a pair of opposite types. Accordingly,




















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11.5 TRANSFORMER Definition: - The transformer is a static electro-magnetic device that transforms one alternating voltage (current) into another voltage (current). However, power




















11.6 DIODES

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Features • •

®

Utilizes the AVR RISC Architecture AVR - High-performance and Low-power RISC Architecture - 120 Powerful Instructions - Most Most Single Clock Cycle Execution - 32 x 8 General Purpose Working Registers



















Pin Configurations Configurations

Figure 1. Pinout ATtiny2313

PDIP/SOIC (RESET/dW) PA2 (RXD) PD0

1 2

20 19

VCC PB7 (UCSK/SCL/PCINT7)

































































































































































































































Device Control Using GSM Mobile Phone Project Electronics

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