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Cell Phone Operated Land Rover
-Sayanton Vhaduri Dibbo(37)-Md. Sazzadul Islam(41)
-Salman Ahmed(09)
Submitted To:Shuvra Chakraborty
Project overviewCell phone operated car is controlled by a
mobile phone that makes a call to the mobile phone attached to the car.
In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end.
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Project overview(cont.)This tone is called ‘dual-tone multiple-
frequency’ (DTMF) tone.
The car perceives this DTMF tone with the help of receiving mobile.
• Then the car can be controlled by the distance mobile.
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Block Diagram
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Components RequiredSemiconductors: Resistors
IC1 - MT8870 DTMF decoder
IC2 - ATmega16 microcontroller
IC3 - L293D motor driver
IC4 - 74LS04 NOT gateD1 - 1N4007 rectifier
diode
R1, R2 - 100-kilo-ohmR3 - 330-kilo-ohmR4-R8 - 10-kilo-ohm
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Components Required(cont.)Capacitors: Miscellaneous:
C1 - 0.47μF ceramic disk
C2, C3, C5, C6 - 22pF ceramic disk
C4 - 0.1μF ceramic disk
XTAL1 - 3.57MHz crystalXTAL2 - 12MHz crystalS1 - Push-to-on switchM1, M2 - 6V, 50-rpm
gearedDC motorBatt. - 6V, 4.5Ah battery
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Circuit Diagram
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MT8870 DTMF Decoder
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ATmega16
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DTMFDTMF assigns a specific frequency
(consisting of two separate tones) to each key so that it can easily be identified by the electronic circuit.
If pressing ‘5’ will send a tone made by adding 1336 Hz and 770 Hz to the other end of the line.
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Tone TableTones and Assignments in a DTMF System
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Working PrincipleWhen a button in mobile is pressed the
DTMF tones thus produced are received by the cellphone in the car.
These tones are fed to the circuit by the headset of the cellphone.
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Working Principle(cont.)The MT8870 decodes the received tone
and sends the equivalent binary number to the microcontroller.
According to the program in the microcontroller, the robot starts moving.
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Action Performed With Key Press
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Problems faced
Connecting headset of the cell phone to DTMF decoder IC input
Defects in the developed PCB
Damage of one wheel driving DC motor
Problem in Network
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Completely developed land rover
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Applicability•Scientific
•Military and law enforcement
•Search and rescue
•Recreation and hobby
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Disadvantages
• Cellphone bill
• Mobile batteries drain out early so charging problem
• Cost of project if Cellphone cost included.
•Not flexible with all cell phones as only a particular, cellphone whose earpiece is attached can only be used.
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Further improvement and future scope
Additional functions
3-D motion of the land rover
3-D motion of the video camera
Sensors
Thank You!
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