1) The document describes a student project to build a cellphone-operated robot that can be controlled via calls made to a mobile phone attached to the robot. 2) The robot uses a DTMF decoder chip to interpret the tones generated when buttons are pressed during a call and sends signals to a microcontroller to control two motors. 3) Potential applications include using the robot for surveillance, vehicle navigation using 3G technology, and adding features like cameras or sensors for future improvements.

1. CELLPHONEOPERATEDROBOT
REPRESENTED BY
T.RAKESH KUMAR
ECE – 4th Year
MIT-HYDERABAD

2. PROJECTIDEAS-
Cell phone as a
Transmitter
Cell phone as a
Receiver
Interface
SPYROBO

3. 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, no interference with other controllers and up to
twelve controls.
• Although, the appearance and capabilities of robot vary
vastly, all robots share the feature of a mechanical,
movables structure under some form of control.

4. BLOCKDIAGRAM-

5. 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,

6. CIRCUITDIAGRAM-

7. COMPONENTUSED-
* Semiconductors:
IC1 - MT8870 DTMF decoder
IC2 - ATmega128 AVR
microcontroller
IC3 - L293D motor driver
IC4 - 74LS04 NOT gate
* Diode - 1N4007 rectifier diode
* 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 ceramic disk
* Miscellaneous:
XTAL1 - 3.57MHz crystal
XTAL2 - 12MHz crystal
* S1 - Push-to-on switch
* M1, M2 - 6V, 50-rpm geared
DC motor
* Batt. - 6V, 4.5Ah battery

8. PCBLAYOUT-

11. COADING-

12. HISTORYOFREMOTECONTROLLED
VECHILE-
• The First Remote Control Vehicle I Precision Guided
Weapon , This propeller-driven radio controlled boat, built
by Nikola Tesla in 1898
• During World War II in the European Theater the U.S. Air
Force experimented with three basic forms radio- control
guided weapons. In each case, the weapon would be
directed to its target by a crew member on a control
plane.

13. WHYWEAREUSINGMOBILENETWORK
FORCONTROLLINGTHEROBOT
• 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.

14. ADVANTAGES-1. Wireless control
2. Surveillance System
3. Vehicle Navigation with use of 3G technology
4. Takes in use of the mobile technology which is
almost available everywhere
5. This wireless device has no boundation of range
and can be controlled as far as network of cell
phone

15. DISADVANTAGES-
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

16. APPLICATIONS-
• Scientific
Remote control vehicles have various scientific uses
including hazardous environments, working in the Deep
Ocean, and space exploration. The majority of the probes
to the other planets in our solar system have been remote
control vehicles, although some of the more recent ones
were partially autonomous.
• Recreation and Hobby
Small scale remote control vehicles have long been
popular among hobbyists. These remote controlled
vehicles span a wide range in terms of price and
sophistication. There are many types of radio controlled
vehicles. These include on-road cars,off-road trucks,
boats, airplanes, and even helicopters.

17. FURTHERIMPROVEMENT
&
FUTURESCOPE
• IR Sensors
• Password Protection
• Alarm Phone Dialer
• Adding a Camera

18. PROBLEMFACED-
• Connecting Hands free of cell phone to DTMF Decoder
IC input-
There were several types of Hands Free cords
available in the market, the right one had to be
chosen from them. Several ways to break up the
cords and connect them to the input of IC 8870
• Selection of Mobile Phone-
At first, latest cell phone like Nokia 5700, N-series
were tried. But they couldn’t give any output
• Defects in developed PCB-
When the supply was given into the PCB, one circuit
track was instantly damaged along with some
burning fumes

19. THANK YOU
