Cell Phone Operated Land Rover....

Cell Phone Operated
Land Rover....

Cell Phone Operated Land Rover is
a kind of toy that is completely based
on DTMF technology.This toy or land
rover can be controlled by cell phone
in all over the world. The land rover
moves in all directions by the help of
cell phone.
Cell Phone Operated Land Rover
Circuit
Basic Principle of Cell
Phone Operated Land
Rover:
This project can be also said a GSM
based wireless car OR A Long
Distance Remote Control Car. The
basic principle of controlling this cell
phone operated land rover is DTMF
(Duel Tone Multiple Frequency). Two
horizontal and vertical frequency set is
used by cell phone buttons, So every
button of the cell phone gets a
particular frequency.
When we dial a number in the mobile
phone and then during the call we
press any button of the cell phone, a
specific tone is generated. All the
tones generated from the cell phone
buttons are different from each other
because every button has a different
frequency. The Cell phone operated
land rover contains 3 basic electronics
components that are listed below:
1. 89C51 Microcontroller
2. MT 8870 DTMF decoder IC
3. L293D Motor driver IC
I will not completely explain the
whole functionality of this circuit. You
can download the complete
discription about this cell phone
operated land rover in the attached
zip file. I am telling the basic
functionality of each component in
this project:
1. MT 8870 IC : MT8870 IC is called a
DTMF decoder that decodes the
encoded DTMF signals sent by the cell
phone and converts them into binary
output.  This IC gives 4 binary outputs.
That’s the main functionality of this
MT8870 IC. After decoding the DTMF
signals it has no further functions.
2. Microcontroller 89C51 :
Microcontroller is a central processing
unit of this project. It processes the
binary output got by DTMF decoder
and provide the sufficiant voltage or
input to the motor driver IC L293D.
The microcontroller is programmed in
such a way that it controlls the car by
5 keys of the mobile (2,8,4,6,5). 5 Key
is used to stop the car and remaining
keys are used to run the car.
3.L293D : is a motor driver IC that
provides reverse and forward voltage
to the dc motors of the Car.