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461 Copyright © 2016. Vandana Publications. All Rights Reserved.

Volume-6, Issue-2, March-April 2016

International Journal of Engineering and Management Research

Page Number: 461-465

Industrial Automation using DTMF Decoder

Neha Takate S1, Gopichand Sonawane G2, Shweta Sonwane3, Mrs.Preeti.Kale4

1,2,3_{Electronics & Telecommunication Department, Late GN Sapkal College of Engineering, Nasik, INDIA} 4_{Guide, Electronics & Telecommunication Department, Late GN Sapkal College of Engineering, Nasik, INDIA}

ABSTRACT

Now a days, in the call center there is automatic playback of the voice data. For the playback of this DTMF decoding principle is used. In this project we are using same DTMF decoding principle. DTMF (Dual Tone Multi Frequency) is used in telephone key matrix. Each key has particular frequency which is the combination of the lower band frequency and upper band frequency. So that, we can detect any key press. In call center they are playing voice data or switching call. In this project, we are going to give command to the machinery through cell phone. But the principle is same. We have undergone a detailed study about the DTMF application and implementation. As a part of our third year curricular activity we are making the project whose title is “Industrial Automation Using Cellphone”. We have used 8051 Microcontroller as a main component of the project. Now a Microcontroller has become a main component of many of the electronic circuits.

Keywords— DTMF, IVR, Decoder

I. INTRODUCTION

In fast moving world, time is most important factor. You can turn on/off device in the industry by giving command through cell phone or landline phone. It will save time as well as manpower required to monitor industrial devices. By using one key command we can interface six devices. We can increase the number of devices. Most important factor about this project is that you can protect this system through password. The person who knows the password can only interfere in the controlling devices. So that wrong call cannot effect on the industrial devices. But in this project password protection is not used. Because password protection is the future scope of this project.

II. NEED

OF

PROJECT

This is more advantages, when we have to turn on the machinery at night when we got order. In this case we can turn on machinery by giving simply command through cell phone or landline phone. Consider another case that,

boiler/blast furnace is taking one hour to become ready for operation. To start working at 9:00 A.M. we have to start boiler at 8:00 A.M. in such case it is necessary to reach field at 8:00 A.M.so avoid such difficulty by just giving command

through cell phone we can turn on/off boiler/blast furnace, etc. There is no need to go to field.

For further future enhancement, By using interactive voice service (IVR) we can add security system. For this we requires sensors and transducer which will detect hazardous condition. Then it will make call on your personal cell phone and give report. It also requires voice recorder IC.

III. SYSTEM

MODELING

Fig 3.1. Block Diagram of The System

3.1.1.EXPLAINATION OF BLOCK DIAGRAM: - 3.1.1.1. MOBILE: -

Here mobile handset plays main role in receiver side. It receives DTMF tone sent by the user. This DTMF tone then transmitted to the decoder(IC CM8870) by using audio jack

which is to be connected to the mobile handset. It consists of any handset having headphone provision. There

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received automatically; then DTMF tones which are sent by transmitter are received by receiver. Receiver sends the DTMF tone to DTMF decoder via headsets.

3.1.1.2 DTMF DECODER IC (CM8870): -

It consists of DTMF decoder IC CM 8870. Its typical design is used to get BCD output. This system uses DTMF IC MT8870C. This IC provides full DTMF receiver capability by integrating both the band split filter & digital decoder functions into a single 18 pin IC. In built decoder circuit converts the DTMF tone into 4 bit BCD output.

Figure 3.1.2.Pin diagram of DTMF decoder

3.1.1.2.1. Features:- • Full DTMF receiver

• Less than 35mW power consumption

• Industrial temperature range

• Uses quartz crystal

This decoder IC CM8870 receives DTMF signal, then this signal is decoded by decoder in the form of BCD code o/p.

Then this BCD code is send to the microcontroller for further operation.

3.1.1.2.2. DTMF Keypad Frequencies Table: -

Table 3.1.1.2.2 Touch Dial Arrangement

‘Touching’ a button generates a tone which is combination of two frequencies, one from lower band and the other from the upper band. For example pressing button 1 transmit combination of frequencies 1209 & 697.

3.2 CIRCUIT DIAGRAM:-

Fig.3.2 Circuit Diagram Of The System

3.2.1. CIRCUIT DETAILS: - DTMF Decoder:-

• DTMF decoder consists of DTMF decoder IC cm 8870. It’s typical design is used to get the BCD output from the DTMF tone. Then this output is interfaced with the 8051 microcontroller. Its operating frequency is 3.58 MHz.

8051 MICROCONTROLLER:-

• 8051 microcontroller is 8 bit micro controller. It can be programmed using assembly language or ‘c’ language. We have used ‘Assembly’ language.

Relays:-

• Relay are used to control the devices. Relays are driven by transistor. Transistor is operated as a switch. BC547 transistors are operated as a driver to the relay.

Crystal:-

• Crystal is operated at 11.0592 MHz so that it can communicate with the personal computer (PC).

Output Devices:-

• Output devices are interfaced at the one end of the relay. For demonstrate purpose we had connected fan, bulb, buzzer. But in real application big machinery and motors will be connected.

LCD (Liquid Crystal Display)

1209 Hz 1336 Hz 1477 Hz

697 Hz 1 2 3

770 Hz 4 5 6

852 Hz 7 8 9

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• LCD is used to display status of the devices in the

Table 3.2.3 Microcontroller pin connections

3.2.2. MICROCONTROLLER Pin Connections:-

• Pin Connections of microcontroller is as given in table below. LCD is connected to Port 2, relays are connected to port 0 and DTMF decoder output are connected to port3

• Also we have to connect some external devices to microcontroller such as Reset circuit, crystal circuit and pull-up resistor along with DC power supply of 5 volts. Reset circuit consists of a 100 micro farad capacitor along with 10 K Ohm resistor, Crystal circuit consist of a 11.0592MHz crystal along with two capacitors of 33pF. And pull-up resistor consist eight inbuilt resistor

During the soldering process the flux acts as a medium for improving the degree of melting. The basic functions of flux are mentioned below:

1. Removes oxide from the surface.

2. It transfers heat from source to the joining & provide liquid cover including air gap.

3. Removal of residue after the completion of the soldering operation.

3.2.7. PCB LAYOUT OF THE SYSTEM: -

Fig 3.2.7. PCB Layout Of The System

IV. SOFTWARE IMPLEMENTATION

4.1. ALGORITHM

Step 1: Start

Step 2: Clear all the registers Step 3: Turn off all the motors Step 4: Initialize LCD

Step 5: Display ‘INDUSTRIAL AUTOMATION USING CELLPHON’

Step 6: Receive password from DTMF decoder Step 7: Check if password is correct?

Step 8: If password is wrong, display ‘Incorrect Message’ on LCD

Step 9: If password is correct then display ‘Correct password’ on LCD

Step 10: Read the DTMF input. Step 11: check if input is = 1

Step 12: If Yes, then turn on first relay. Step 13: if no then check input is = 2 Step 14: If Yes, then turn on second relay. Step 15: if no then check input is =3 Step 16: If Yes, then turn on third relay. Step 17: if no then check input is =4 Step 18: If Yes, then turn on forth relay. Step 19: if no then check input is =5 Step 20: If Yes, then turn on fifth relay. Step 21: if no then check input is =6 Step 22: If Yes, then turn on sixth relay. Step 23: if no then check input is =7 Step 24: If Yes, then turn off first relay. Step 25: if no then check input is =8 Step 26: If Yes, then turn off second relay. Step 27: if no then check input is =9 Step 28: If Yes, then turn off third relay. Step 29: if no then check input is =* Step 30: If Yes, then turn off forth relay. Step 31: if no then check input is =0 Step 32: If Yes, then turn off fifth relay. Step 33: if no then check input is = # Step 34: If Yes, then turn off Sixth relay. PIN

NO. DESCRIPTION

PIN

NO. DESCRIPTION

P0.0 Relay 1 P2.0 NC

P0.1 Relay 2 P2.1 NC

P0.2 Relay 3 P2.2 LCD Pin no. 4

P0.3 Relay 4 P2.3 LCD Pin no. 6 P0.4 Relay 5 P2.4 LCD Pin no. 11 P0.5 Relay 6 P2.5 LCD Pin no. 12 P0.6 NC P2.6 LCD Pin no. 13 P0.7 NC P2.7 LCD Pin no. 14

P1.0 NC P3.0 NC

P1.1 NC P3.1 NC

P1.2 NC P3.2 NC

P1.3 NC P3.3 NC

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V. RESULTS

Fig. 5.3.1When Key 1 of Mobile Key Pad is Pressed then Fan is in ON condition

Fig. 5.3.2 When Key 2 of Mobile Key Pad is Pressed then LED 1 is in ON condition

Fig. 5.3.3 When Key 3 of Mobile Key Pad is Pressed then LED 2 is in ON condition

Fig. 5.3.4 When Key 6 of Mobile Key Pad is Pressed then BUZZER is in ON condition

Fig. 5.3.6 When Key 8 of Mobile Key Pad is Pressed then LED 2 is in OFF condition

VI. CONCLUSIONS

6.1.APPLICATIONS: - a. INDUSTRIAL CONTROL: -

1.It is used to control or switch on any automatic process control machinery.

2.Automatic production machinery could be controlled

even during odd hours with your mobile phone.

b. HOME AUTOMATION: -

1. To control (ON/OFF) the home appliances according to there status when we are going away from home.

c. FARM AUTOMATION: -

1. To control & monitor the various irrigation equipment in the farm.

6.2. ADVANTAGES:-

1. Eliminates the continuously monitoring, it facilitates 24 hours a day, 365 days in year communication between system and user.

2. Commands can be given through remote place, directly to the machine.

3. By further modification security system can be added.

4. Entire control is password protected. 5. Easy to install & simple in operation.

6.3 LIMITATIONS:-

1. If the GSM network used in mobile does not have any coverage then we have to use landline phone 2. It is not useful for large number of application but by

using multiple keys for device operation we can increase umber of application.

6.4. CONCLUSION

With the knowledge of new techniques in ‘Electronics’ we are able to make our life more comfortable. One such application of electronics is used in “Industrial Control Through Cell Phone” The approach we followed and which is explained in this project report is novel and has achieved the target of “Industrial Control Through Cell Phone” satisfying user needs and requirements.

Industrial control through cell phone is automatic versatile system. It can be implemented in industry, home, agricultural field, remote and hazardous applications. It provides the flexibility & system reliability with low cost as well as less maintenance. It provides remote access to the system to deliver service at any time of the day. With this system, we can control as well as monitor the devices at remote location.

The development of this project has shown how much hard work goes into the creation of a system. “Industrial Control Through Cell Phone” is a project based on microcontroller, due to which hardware requirement is reduced.

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6.5. FUTURE SCOPE

• Computer can be interfaced for more complex & precise application.

• System reliability can be improved.

• Voice interactive services can be added to offer better interaction with user.

• By further modification security system can be added.

REFERENCES

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“3 G based industrial automation using GSM communication” ,International Journal of Research in Environmental Science and Technology

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[3] Mr Basavanna M, Ms Ashwini G, Ms Divyashree G N,, Ms Pooja Bhat M S, Ms Sanjana S Prabhu “GSM Based Wireless Robot Vehicle with POF features using DTMF”,International Refereed Journal of Engineering and Science (IRJES) ISSN (Online) 2319-183X, (Print) 2319-1821 Volume 4, Issue 5 (May 2015), PP.12-17 [4] Yun Chan Cho and Jae Wook Jeon ”Remote Robot Control System based on DTMF of Mobile Phone” Department of Mobile Communications, SungKyunKwan University, Suwon, Korea.

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[9] Abdiweli Abdillahi Soufi1, Abdirasoul Jabar Alzubaidi “ Remote Control System through Mobile and DTMF” International Journal of Computational Engineering Research||Vol, 03||Issue, 8||

[10] Haimanti Chakraborty*, Prof. (Dr.) Prabir Banerje “Design of a Circuit for Remote Control of Multiple Devices using DTMF Encoder and Decoder” International Journal of Scientific and Research Publications, Volume 3, Issue 12, December 2013

[11] Tejaswiny Singh, Ramandeep Singh “Mobile Phone Based Internal Appliance Control Using Avr Development

Boar” International Journal of VLSI and Embedded Systems-IJVES

[12] Tuljappa M Ladwa, Sanjay M Ladwa, R Sudharshan Kaarthik, Alok Ranjan Dhara, Nayan Dalei” Control Of Remote Domestic System Using DTMF”ICICI-BME 2009 Bandung, Indonesia

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[14] Rohit Sharma, Kushagra Kumar and Shashank Vig” DTMF Based Remote Control System” Waknaghat, Solan. 173215 H. P. India