This document describes a mobile phone controlled robot project. The robot uses dual tone multi-frequency (DTMF) tones sent from a mobile phone acting as the transmitter to control a second mobile phone acting as the receiver attached to the robot. When buttons are pressed on the transmitting phone, corresponding DTMF tones are decoded by a microcontroller on the robot which sends signals to drive motors forward, backward, or turn. This allows wireless control of the robot over mobile networks without requiring a separate transmitter and receiver. The document outlines the components used, working, applications and advantages like long range control compared to traditional radio controlled robots.

1. Under The Guidance Of:
Prof Srikant Dash
HOD,EEE Dept,GIFT
• Presented by:
• Asish Kumar Nayak
• Asutosh Meher
• Bekram Keshari Mohanty
• Abhisek Mishra

2. CONTENT
1. Project idea
2. Introduction
3. Literature review
4. Block diagram
5. Working
6. Component used
7. Action performed corresponding to key
8. Why We Are Using Mobile Network
9. Advantages & Disadvantages
10. Application
11. Future Scope
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3. PROJECT IDEA - 3
Cell phone as a
Transmitter
Cell phone as a
Receiver
Interface
SPYROBO

4. INTRODUCTION -
 Conventionally, wireless controlled robots user circuits, which have a
drawback of limited working range, limited frequency range and
limited control.
 Use of mobile phones for robotic control can overcome these
limitations.
 It provides the advantages of robust control, working range as large
as the coverage area of the service provider’
 Although, the aperance and capabilities of robot vary vastly, all
robots share the feature of a mechanical, movables structure under
some form of control.
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5. BLOCK DIAGRAM - 5

6. WORKING -
 To control the robot by a mobile phone (as transmitter) that makes
call to the mobile phone (as receiver) attached to the robot
 In the course of the call, if any button is pressed control
corresponding to the button pressed is heard at the other end of the
call. This tone is called dual tone multi frequency tome (DTMF) robot
receives this DTMF tone with the help of phone stacked in the robot.
 The received tone is processed by the ATMEGA 128 microcontroller
with the help of DTMF decoder MT8870 the decoder decodes the
DTMF tone in to its equivalent binary digit and this binary number is
send to the microcontroller,
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7. WORKING -
 the microcontroller is preprogrammed to take a decision for any give
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
 The signal generated by the DTMF encoder is the direct al-gebric
submission, in real time of the amplitudes of two sine (cosine) waves
of different frequencies, i.e., pressing 5 will send a tone made by
adding 1336 Hz and 770 Hz to the other end of the mobile.
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8. 8

9. COMPONENT USED -
* Semiconductors:
IC1 - MT8870 DTMF decoder
IC2 - ATmega128 AVR
microcontroller
IC3 - L293D motor driver
IC4 - 74LS04 NOT gate
* Resistors -
R1, R2 - 100-kilo-ohm
R3 - 330-kilo-ohm
R4-R8 - 10-kilo-ohm
* Capacitors:
C1 - 0.47μF ceramic disk
C2, C3, C5, C6 - 22pF ceramic disk
C4 - 0.1μF
* S1 - Push-to-on switch
* M1, M2 - 6V, 50-rpm geared
DC motor
* Batt. - 6V, 4.5Ah battery
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10. ACTION PERFORMED CORRESPONDING TO
THE KEY
NUMBER PRESSED ACTION
PERFORMED
2 FORWARD MOTION
4 LEFT TURN
6 RIGHT TURN
8 BACKWARD MOTION
5 STOP
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11. WHY WE ARE USING MOBILE
NETWORK
FOR CONTROLLING THE ROBOT
 Wireless-controlled robots use Radio frequency circuits, which have
the drawbacks of limited working range, limited frequency range
and the limited control
 Mobile phone for robotic control can overcome these limitations and
provides the advantage of robust control, working range as large as
the coverage area of the service provider, no interference with other
controllers.
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12. ADVANTAGES -
1. Wireless control
2. Vehicle Navigation with use of 3G technology
3. Takes in use of the mobile technology which is almost
available everywhere
4. This wireless device has no boundation of range and can be
controlled as far as network of cell phone
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13. DISADVAANTAGES -
1. Cell phone bill
2. Mobile batteries drain out early so charging problem.
3. Cost of project if Cell phone cost included.
4. Not flexible with all cell phones as only a particular ,cell phone
whose earpiece is attached can only be used
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14. APPLICATIONS -
 Military and Law Enforcement
Soviet Red Army used remotely controlled Tibetans during 1930s in
the Winter War and early stage of World War II. There were also
remotely controlled cutters and experimental remotely controlled
planes in the Red Army.
 Search and Rescue
UAVs will likely play an increased role in search and rescue in the
United States. This was demonstrated by the successful use of UAVs
during the 2008 hurricanes that struck Louisiana and Texas.
 Scientific
Remote control vehicles have various scientific uses in hazardous
environments.
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15. FURTHER IMPROVEMENT & FUTURE
SCOPE
 IR Sensors
 Password Protection
 Adding a Camera
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16. REFERENCE
[1] T. M. Ladwa, S. M. Ladwa, and R. S. Kaarthik, A. R. Dhara, and N.
Dalei, “Control of Remote Domestic System Using DTMF,”
presented at ICICI-BME 2009 Bandung, Indonesia, 2009.
[2] Y. C. Cho and J. W. Jeon, “Remote Robot control System based on
DTMF of Mobile Phone,” IEEE International Conference INDIN,
2008, July 2008.
[3] M. J. Callahan, Jr., “Integrated DTMF receiver,” ZEEE J. Solzd-State
Czrcuzts, vol. Sc-14, pp. 85-90, Feb. 1979.
[4] M. Callahan Jr., “Integrated DTMF Receiver,” IEEE Transactions on
communications, vol. 27, pp. 343-348, February 1979.
All datasheets from
www.roboticsbible.com/project-mobile-controlled-
robot.html
www.datasheetcatalog.com
www.atmel.com
www.triindia.co.in
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17. Thank You

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