1 ACKNOWLEDGEMENT We pay our countless thanks and humilities to the creator of every heaven and earth, the most altruistic, the most benevolent. The completion of this task is only because of his blessings. With the belief on His majesty we were able to accomplish this Task. We would also like to thank our families and friends for their continuous encouragement and moral support. Malik Muhammad Zaid (2013-EE-37)
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1
ACKNOWLEDGEMENT
We pay our countless thanks and humilities to the creator of every heaven and earth, the most altruistic, the
most benevolent. The completion of this task is only because of his blessings. With the belief on His majesty we
were able to accomplish this Task.
We would also like to thank our families and friends for their continuous encouragement and moral support.
Malik Muhammad Zaid (2013-EE-37)
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ABSTRACT
Now-a-days due to advancement of technology , wireless system becoming more and more popular.Every thing
is going to work on the system which takes only commands through wireless systems.The major example is
mobile phone.Smartphones acts as remote controls for car. This technology is not new. Various applications and
technologies are already available that can enable your phone to remotely unlock the door or start your car. So
by using voice interactive response technology (IVR) we can move not only a toy car but even a large car forward
and backward. Companies are working on concepts allowing cars to cruise along on the highway without driver
intervention known as hands free driving. By using this IVR technology we can increase or decrease the speed
of car by just merely dialing numbers. Using this dual tone multi frequency technology we can lock and unlock
the doors and ignite the engine by using mobile phone.Now we can control the House-Hold appliances as well
as industrial appliances through wireless syetem based technology.We have created the project named “Mobile
Controlled Car Through Voice Call” .In this we can control Car through voice call , after that we can handle the
car in every direction where we want along with its speed control.This technology is basically using in “Drones”
now-a-days.In future this technology will be used in most of appliances especially in cars e.t.c
1.1.2 Working of DTMF Decoder Circuit: ................................................................................................................. 7
1.3 Motor Driver Circuit: ............................................................................................................................................. 14
1.3.1 Advantages of motor driver circuit: .............................................................................................................. 14
Figure 1.1 Circuit diagram of Mobile Control Car Through Voice Call ................................................................................... 5
Figure 1.2 Block diagram of Mobile Control Car Through Voice Call .................................................................................... 6
Figure 1.3 Keypad Buttons Frequency ................................................................................................................................... 6
Figure 1.4 Circuit Diagram of DTMF circuit ............................................................................................................................ 8
Figure 1.5 Physical Discription of DTMF Circuit ..................................................................................................................... 9
Figure 1.6 Frequency & Logic of keypad buttons generated by DTMF circuit .................................................................... 10
Figure 1.7 TIVA ARM TM4C1233H6PM ............................................................................................................................... 11
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1 PROJECT OVERVIEW:
The project is basically mobile controlled car through voice call. In this project the car is controlled by a
mobile phone. 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).
Car receives this DTMF tone with the help of phone stacked in the car. The DTMF decoder on the basis
of frequency convert it into binary equivalent.
The received tone is processed by the LM4F120H5QR 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, the microcontroller is programmed 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 motor (L293D) is basically governed by outputs of microcontroller. The mobile phone that
makes the call to the mobile phone stacked in car is transmitter.The mobile phone that is stacked in car
is receiver. On the course of call numbers are dialed from transmitter and tone is generated on receiver
mobile.
So our project consists of three parts:
DTMF circuit
Controller
Motor driver circuit
Figure 1.1 Circuit diagram of Mobile Control Car Through Voice Call
The following block diagram shows how DTMF decoder , LM4F120H5QR microcontroller and L293D
motors are interlinked.Motor driver circuits will motors to proceed on the basis of microcontroller
outputs.
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Figure 1.2 Block diagram of Mobile Control Car Through Voice Call
1.1 DTMF (DUAL TONE MULTI FREQUENCY) CIRCUIT: A telephone keypad was standardized when the dual-tone multi-frequency system in the new push-button
telephone was introduced in the 1960s, which gradually replaced the rotary dial. When used to dial a
telephone number, pressing a single key will produce a dual-tone multi-frequency signaling pitch
consisting of two simultaneous pure tone sinusoidal frequencies. The row in which the key appears
determines the low frequency, and the column determines the high frequency. For example, pressing the
'1' key will result in a sound composed of both a 697 and a 1209 hertz (Hz) tone as shown in figure
Figure 1.3 Keypad Buttons Frequency
To convert this dual tone multi frequency signal which is an in-band tele-communication signaling system
using the voice-frequency band, we need a circuit that converts it into binary equivalent on the basis of
number pressed. This binary will be then processed by microcontroller. For this we use DTMF decoder