Mobile Operated Robot Based on DTMF Decoder

IJSRD - International Journal for Scientific Research & Development| Vol. 4, Issue 01, 2016 | ISSN (online): 2321-0613

Mobile Operated Robot Based on DTMF Decoder Mr. Sachin S. Gaikwad1 Miss. Shital K. Barge2 Miss. Prachi S. Gharge3 Prof. Rajesh R. Dodake4 1,2,3 Student 4Assistant Professor 1,2,3,4 Department of Electronics and Telecommunication Engineering 1,2,3,4 Dr. Daulatrao Aher College of Engineering, Karad,Tal- Karad, Dist- Satara, Maharashtra Abstract— In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called ‘dual-tone multiple-frequency’ (DTMF) tone. The robot perceives this DTMF tone with the help of the phone stacked in the robot. The received tone is processed by the microcontroller with the help of DTMF decoder MT8870. The decoder decodes the DTMF tone into its equivalent binary digit and this binary number is sent to the microcontroller. The microcontroller is preprogrammed to take a decision for any given input and outputs its decision to motor drivers in order to drive the motors for forward or backward motion or a turn. The mobile that makes a call to the mobile phone stacked in the robot acts as a remote. So this simple robotic project does not require the construction of receiver and transmitter units.In this robot camera is used for viewing any situation in any particular area & voice recorder for voice recording purpose.

Key words: DTMF Decoder, Microcontroller, Motor Driver, Voice Recorder, Wireless Communication I. INTRODUCTION In today’s life, mobile is basic need of life. Whole world is easily communicate by mobile phone. Now days human life is so busy and everybody want to complete his work very easily and comfortably. Because of this thinking Robot operated by mobile concepts developed. Mostly wirelesscontrolled robots use RF circuits, which have the drawbacks of limited frequency, limited control & limited frequency range. Since here mobile phone is used for control the operation of robot, can overcome these limitations. The robot is controlled by a mobile phone that makes a call to the other mobile phone attached to the robot. In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called „dual-tone multiple-frequency‟ (DTMF) tone.

The robot perceives this DTMF tone with the help of the phone stacked in the Robot. The tones and assignment is shown in below table

II. PROPOSED BLOCK DIAGRAM & WORKING

Fig. 2: Proposed Block Diagram of Mobile Operated Robot Based on DTMF Decoder In the course of a call if any button is pressed a tone corresponding to the button pressed is heard at the other end of the call.This tone is called Dual tone multiple frequency.

The received tone is processed by the microcontroller 8051 with the help of DTMF decoder MT8870.The decoder decodes the DTMF tone into it’s equivalent binary digit means when press key 4 it’s output is (0000 0100)at that time adding frequency 1209Hz &770Hz& this binary number is send to the microcontroller. After that microcontroller processed this binary number& gives out put to the motor driver IC L293Dwith the help of this IC motor operated Forward, Backward, Right &Left Direction.

Camera with transmitter is connected to front side of robot, this camera send live information & sound to words the receiver side. at the receiver side connect the TV for the viewing live situation After that APR9600 voice IC store the noiseless voice in the IC

Fig. 1:

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Mobile Operated Robot Based on DTMF Decoder (IJSRD/Vol. 4/Issue 01/2016/138)

III. FLOW OF EXECUTION OF SYSTEM

Fig. 3: When key pressed by user at that time frequency can be generated. This generated frequency decoded by DTMF decoder. These decoded data goes to microcontroller after that it take decision. When data is valid then direction decided by microcontroller otherwise it goes to initial condition after that microcontroller gives output to motor driver IC and continue this procedure of execution of system.

IV. HARDWARE REQUIREMENT Important components DTMF Decoder Microcontroller Motor Driver IC APR9600 voice IC A. Dtmf Decoder: DTMF dialing uses pressed 10/14buttons. Each key when pressed,generates two separate tones frequencies, so a voice or a random signal cannot imitate the tones. One tone is generated from a high frequency group of tones and the other from low frequency group. The frequencies generated on pressing different phone The tones produced when key pressed on the mobile phone could be used to represent the digits, and a separate tone is used for each digit. However, there is always a chance that a random sound will be on the same frequency which will trip up the system. It was suggested that if two tones were used to represent a digit, the likelihood of a false signal occurring is ruled out. This is the basis of using dual tone in DTMF communication

Fig. 4: Pin diagram of MT8870 Decoder The MT8870 DTMF decoder is used here because is a complete DTMF receiver. It is both integrating the band split filter and digital decoder functions. The filter section uses switched capacitor techniques for high and low group filters, the decoder uses digital counting techniques to detect and decode all 16 DTMF tone-pairs into a 4-bit code output Features  Complete DTMF receiver  Low power consumption  Internal gain setting amplifier  Adjustable guard time  Central office quality Microcontroller 8051 The Intel 8051 is an 8-bit microcontroller which means that most available operations are limited to 8 bits.

There are 3 basic "sizes" of the 8051: Short, Standard, and Extended. The Short and Standard chips are often available in DIP (dual in-line package) form, but the Extended 8051 models often have a different form factor, and are not "dropin compatible". All these things are called 8051 because they can all be programmed using 8051 assembly language, and they all share certain features (although the different models all have their own special features).

Criteria for selection of microcontroller 8051  Speed of operation  Packing  Power consumption  Amount of RAM and ROM on chip  No. of I/O pins and timers on chip  Cost

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Mobile Operated Robot Based on DTMF Decoder (IJSRD/Vol. 4/Issue 01/2016/138)

Fig. 5: It is a low-power, high-performance 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. It is high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pin out. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, It is a powerful microcontroller which provides a highly-flexible and costeffective solution to many embedded control applications.

Features  4.0V to 5.5V Operating Range  32 Programmable I/O Lines  Three 16-bit Timer/Counters  Full Duplex UART Serial Channel  Low-power Idle and Power-down Modes  Watchdog Timer  Dual Data Pointer  Power-off Flag B. Motor Driver IC L293d: The L293D motor driver is available for providing User with ease and user friendly interfacing for embedded application. L293D motor driver is mounted on a good quality, single sided non-PTH PCB. The pins of L293D motor driver IC are connected to connectors for easy access to the driver IC’s pin functions. The L293D is a Dual Full Bridge driver that can drive up to1Amp per bridge with supply voltage up to 24V. It can drive two DC motors, relays, solenoids, etc. The device is TTL compatible. Two H bridges of L293D can be connected in parallel to increase its current capacity to 2 Amp.

Fig. 6: Pin diagram of Motor Driver IC L293D Features:  Easily compatible with any of the system  Easy interfacing through FRC (Flat Ribbon Cable)  External Power supply pin for Motors supported  Onboard PWM (Pulse Width Modulation) selection  switch  2pin Terminal Block (Phoenix Connectors) for easy  Motors Connection  Onboard H-Bridge base Motor Driver IC (L293D) APR9600 Voice IC:The APR9600 device offers true single-chip voice recording, non-volatile storage, and playback capability for 40 to 60 seconds. The device supports both random and sequential access of multiple messages. Sample rates are user-selectable, allowing designers to customize their design for unique quality and storage time needs. Integrated output amplifier, microphone amplifier, and AGC circuits greatly simplify system design. The device is ideal for use in portable voice recorders, toys, and many other consumer and industrial applications.

APLUS integrated achieves these high levels of storage capability by using its proprietary analog/multilevel storage technology implemented in an advanced Flash nonvolatile memory process, where each memory cell can store 256 voltage levels. This technology enables the APR9600 device to reproduce voice signals in their natural form. It eliminates the need for encoding and compression, which often introduce distortion.

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Mobile Operated Robot Based on DTMF Decoder (IJSRD/Vol. 4/Issue 01/2016/138)

Browse Hex file – Select baud rate – Start the process of burning Microcontroller VI. CONCLUSION AND FUTURE SCOPE The primary purpose of the mobile phone operated Robot with DTMF decoder is to know the information in the places where we cannot move. The robot perceives the DTMF tone with the help of the phone stacked in the robot. It provides the advantage of robust control, working range as large as coverage area of service provider.

Designing of circuit. &It can be possible to add camera& voice recorder. Camera can be used to automatically click the pictures and then we understand the exact condition of event. Voice recorder is used for what kind of sounds are arise from event are recorded.

REFERENCES

Fig. 7: Pin diagram of APR9600 Voice IC Features: Single-chip, high-quality voice recording & playback solution  No external ICs required  Minimum external components  Non-volatile Flash memory technology  No battery backup required  User-Selectable messaging options  Random access of multiple fixed-duration messages  Sequential access of multiple variable-duration messages  User-friendly, easy-to-use operation  Programming & development systems not required  Level-activated recording & edge-activated play back switches  Low power consumption  Operating current: 25 mA typical  Standby current: 1 uA typical  Automatic power-down  Chip Enable pin for simple message expansion

[1] K. Aruna, A. Sri Ramsagar, G.Venkateswarlu“Mobile Operated Landrover Using DTMF Decoder” International Journal of Modern Engineering Research (IJMER).

[2] Firoz Mahmud, Al Arafat, Syed Tauhid Zuhori “Autonomous Mobile Robot Navigated by using DTMF Signaling” International Journal of Scientific & Engineering Research, Volume 4, Issue 8, August-2013.

[3] SumonaBiswas, Bipin Kumar, Adityakushwaha, DebasishSardar “Cell Phone Operated Land Rover”International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 23218169 Volume: 2 Issue: 3 617 – 621 [4] TejaswinySingh,Ramandeep Singh “Mobile Phone Based Internal Appliance Control Using AVR Development Board ”International Journal of VLSI and Embedded Systems, Article 06373 July 2014 [5] AwabFakih, JovitaSerrao“Cell Phone Operated Robotic Car” [6] P. Raghavendra Prasad and K. Susram Rahul “Cellphone-Operated Land Rover” [7] “The 8051 Microcontroller and Embedded Systems” By Muhammad Ali Mazidi and Janice GillispieMazidi.

Pearson Education.

V. SOFTWARE REQUIREMENT In the KEIL software is written in Assembly language and compiled using Code Vision Mc 8051 Assembly compiler.

The source program is converted into hex code by the compiler. Burn this hex code into microcontroller with the help of Flash magic.

KEIL SOFTWARE Select Project–Open Project Select Close previous program project Select Project after create a new project in any folder Select IC – Create target – add source group – remove Startup’s Select File – New file – Write Program – Save Program – Rebuild all target files or Build target – Select Debugging – Start/Stop Debug Session Create Hex file – Select Flash – Select Configure flash tools – Output – Select on Create Hex file.

Flash Magic

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