Cellphone Operated Land Rover (Modi Institute of Tecnology Kota)

8/6/2019 Cellphone Operated Land Rover (Modi Institute of Tecnology Kota)

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A

P r o j e c t R e po r t on

CELLPHONE CONTROLLED ROBOT

Submitted to

Rajasthan Technical University, Kota

In Partial Fulfillment of the requirement for the award of the degree of

Bachelor of Technology

In

Electronics & Communication Engineering

2 0 1 0 -2 0 1 1

Submitted by: Supervised by:Kaushal Singh Kiroula Mrs. Shruti Pancholi

Mohit Sharma (Lecturer, Depts. ECE)

Mhd. Shahbaz Khan

Kapil Sharma

Modi Inst i tute of Technology

Nayagaon, Rawatbhata Road, Kota


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ABSTRACT

In this project the robot, is controlled by a mobile phone that makes call to the mobile phone

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 atmega16 microcontroller with the help of DTMF decoder

HT9170 the decoder decodes the DTMF tone in to its equivalent binary digit and this binary

number is send to the microcontroller, 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.

DTMF signaling is used for telephone signaling over the line in the voice-frequency band to the

call switching centre. The version of DTMF used for telephone tone dialing is known as Touch-

Tone.

DTMF assigns a specific frequency (consisting of two separate tones) to each key So that it can

easily be identified by the electronic circuit. The signal generated by the DTMF encoder is a

direct algebraic summation, in real time, of the amplitudes of two sine (cosine) waves of

different frequencies.


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CHAPTER 1

INTRODUCTION

Robotics is an interesting field where every engineer can showcase his creative and technical

skills. Pleasing aspect of robotics is that a robot can be made indigenously by anyone. In this

competitive world there is need for every enthusiastic, amateur to professional, to make a simple

robot having innovated applications and with robust control.

Mobile phones today became an essential entity for one and all and so, for any mobile based

application there great reception. In this scenario making a mobile phone operated land rover is a

good idea. Conventionally wireless controlled robots utilize RF circuits, which had limitations

like limited range, limited frequency ranges and controls. But a mobile phone controlled robot

can hold up these limitations. It has a robust control, unlimited range (coverage area of the

service provided), no fear of interfering with other controllers and we can have as much as

12controls.

Although the appearance and capabilities of robots vary vastly, all robots share the features of a

mechanical, moveable structure under some form of control. This control of robot involves three

distinct phases: perception, processing and action. In common preceptors are sensors mounted on

the robot, processing is done by on-board microcontroller or processor and task (action) is

performed using motors or with some other actuators.


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CHAPTER 2

TECHNOLOGY USED

2.1Dual-Tone Multi-Frequency (DTMF)

Dual-tone multi-frequency (DTMF) signaling is used for telecommunication signaling over

analog telephone lines in the voice-frequency band between telephone handsets and other

communications devices and the switching center. The version of DTMF used for telephone tone

dialing is known by the trademarked term Touch-Tone, and is standardized by ITU-T. It is also

known in the UK as MF4. Other multi-frequency systems are used for signaling internal to the

telephone network.

As a method of in-band signaling, DTMF tones were also used by cable television broadcasters

to indicate the start and stop times of local commercial insertion points during station breaks for

the benefit of cable companies. Until better out-of-band signaling equipment was developed in

the 1990s, fast, unacknowledged , and loud DTMF tone sequences could be heard during the

commercial breaks of cable channels in the US and elsewhere.

2.1.1Telephone keypad

The contemporary keypad is laid out in a3x4 grid, although the original DTMF keypad had an

additional column for four now-defunct menu selector keys. When used to dial a telephone

number, pressing a single key produce a pitch consisting of two simultaneous pure tones

sinusoidal frequencies. The row in which the key appears determines the low frequency, and the

column determines the high frequency. For e.g., pressing the 1 key will result in a sound

composed of both a 697 and a 1209Hz tone. The original keypads had levers inside, so each

button activated two contacts. Multiple tones are the reason for calling the system multi


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frequency. These tones are then decoded by the switching center to determine which key was

pressed.

2.1.2 Tones #, *, A, B, C AND D

The Engineers had envisioned phones being used to access computers, and surveyed a number of

companies to see what they would need for this role. This led to the addition of number sign (#

sometimes called octothorpe in this context) and asterisk or star (*) keys as well as a group

of keys for menu selection: A, B, C and D. In the end the lettered keys were dropped from most

phones, and it was many years before these keys became widely used for vertical service codessuch as *67 in United States and Canada for suppressing caller ID.

The U.S. military also used the letters, relabeled in their new defunct Autovon phone system.

Here they were used before dialing the phone in order to give some calls priority, cutting in over

existing calls if need be. The idea was to allow important traffic to get through every time. The

levels of priority available were Flash Override (A), Flash (B), Immediate (C), and Priority (D),

with Flash Override being the highest priority.

A DTMF telephone keypad


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CHAPTER 3

DESIGN AND DEVELOPMENT

The important components of this robot are a DTMF decoder, microcontroller and motor driver.

An HT9170 series DTMF decoder is used here. All types of the HT9170 series use digital

counting techniques to detect and decode all the 16 DTMF tone pairs into a 4-bit code output.

The built-in dial tone rejection circuit eliminates the need of pre-filtering.

When the input signal given at pin 2(IN-) in single-ended input configuration is recognized to be

effective, the correct4-bit decode signal of the DTMF tone is transferred to (pin11) through

(pin14) outputs. The pin11 to pin14 of DTMF decoder are connected to the pins of

microcontroller (pa0 to pa3).The ATmega16 is a low power, 8-bit CMOS microcontroller based

on the AVR enhanced RISC architecture. it provides the following features: 16kb of in-system

programmable flash program memory with read-while-write capabilities, 512 bytes of EEPROM,

1kb SRAM, 32(I\O) lines. Outputs from port pins PD0 through PD3 and PD7 of the

microcontroller are fed to the inputsIN1 through IN4 and enable pins (EN1 and EN2) of motor

driver L293D IC, respectively to drive two geared dc motors. Switch S1 is used for manual reset.

The microcontroller output is not sufficient to drive the dc motors, so current drivers are required

for motor rotation. The L293D is a quad, high-current, half-h driver designed to provide

bidirectional drive currents of upto600mA at voltages from 4.5V to 36V. It makes it easier to

drive the dc motors. The L293D consists of four drivers. Pins IN1 through IN4 and OUT1

through OUT4 are the input and output pins, respectively, of driver 1 through driver 4. Drivers 1

and 2, and driver 3 and 4 are enabled by enable pin 1(EN1) and pin 9 (EN2), respectively.


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When enable input EN1 (pin1) is high, drivers 1 and 2 are enabled and the outputs corresponding

to their inputs are active. Similarly, enable input EN2 (pin9) enables drivers 3 and 4 .

TABLE I

Tones and Assignments in a DTMF system

Frequencies 1209Hz 1336Hz 1477Hz 1633Hz

697Hz 1 2 3 A

770Hz 4 5 6 B

852Hz 7 8 9 C

941Hz * 0 # D

TABLE II

DTMF Data Output


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Low

group(Hz)

High

group(Hz)

Digit OE D3 D2 D1 D0

697 1209 1 H L L L H

697 1336 2 H L L H L

697 1477 3 H L L H H

770 1209 4 H L H L L

770 1336 5 H L H L H

770 1477 6 H L H H L

852 1209 7 H L H H H

852 1336 8 H H L L L

852 1477 9 H H L L H

941 1336 0 H H L H L

941 1209 * H H L H H

941 1477 # H H H L L

697 1633 A H H H L H

770 1633 B H H H H L

852 1633 C H H H H H

941 1633 D H L L L L

_______ ______ ANY L Z Z Z Z


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TABLE III

Actions Performed Corresponding to the keys pressed

Number

pressed by

user

Output of

HT9170

Input to the

microcontroller

Action performed

2

0x02

00000010

0xFD

11111101

Forward motion

4

0x0F

00000100

0xFB

11111011

Left turn

Right motor forwarded

Left motor back warded

6

0x06

00000110

0xF9

11111001

Right turn

Right motor back warded

Left motor forwarded

8

0x08

00001000

0xF7

11110111

Backward motion

5

0x05

00000101

0xFA

11111010

Stop


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3.1 Block Diagram

Figure 1 Block Diagram of CellPhone Controlled Robot

Block Diagram Description

The following are the main components in block diagram

Phone unit

DTMF decoder

Microcontroller

Motor driver


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Phone unit is to give the desired control to the decoder part.

DTMF decoder is to decode the input signal to corresponding binary.

Microcontroller converts the incoming binary to corresponding codes to require driving

the motor driver.

Motor driver amplify the input signal for driving motor

3.2 Circuit Diagram

Figure 2 Circuit Diagram of CellPhone Controlled Robot


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3.3 Components Used

Semiconductors:

HT9170 DTMF decoder

ATMEGA 16 microcontroller

L293D motor driver

74LS04 hex inverting gate

Resistors (all -watt, 5% carbon):

100-kilo-ohm

300-kilo-ohm

10-kilo-ohm

100-ohm

220-ohm

Capacitors:

0.1mF ceramic disk

20pF ceramic disk

33pFceramic disk

Miscellaneous:

3.57MHz crystal

12MHz crystal

SW - Push-to-on switch

M1, M2 - 200-rpm geared DC motor

Bt1, Bt2 - 9V battery

TV Transmitter and Voltage regulator 7805


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3.4 Components Details

HT9170 DTMF Decoder

DTMF Receiver

Features:

Operating voltage: 2.5V~5.5V

Minimal external components

No external filter is required

Low standby current (on power down mode)

Excellent performance

Tristate data output for _C interface

3.58MHz crystal or ceramic resonator

1633Hz can be inhibited by the INH pin

General Description:

The HT9170 series are Dual Tone Multi Frequency (DTMF) receivers integrated with digital

decoder and band split filter functions. The HT9170B and HT9170D types supply power-down

mode and inhibit mode operations. All types of the HT9170 series use digital counting

techniques to detect and decode all the 16 DTMF tone pairs into a 4-bit code output. Highly

accurate switched capacitor filters are employed to divide tone (DTMF) signals into low and

high group signals. A built-in dial tone rejection circuit is provided to eliminate the need for pre-

filtering.


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Block Diagram:

Figure 3 Block Diagram of DTMF Receiver

Functional Description:

Overview:

The HT9170 series tone decoders consist of three band pass filters and two digital decode

circuits to convert a tone (DTMF) signal into digital code output. An operational amplifier is

built-in to adjust the input signal (refer to Figure 2).


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Steering control circuit:

The steering control circuit is used for measuring the effective signal duration and for protecting

against drop out of valid signals. It employs the analog delay by external RC time-constantcontrolled by EST.

The timing is shown in Figure 3. The EST pin is normally low and draws the RT/GT pin to keep

low through discharge of external RC. When a valid tone input is detected, EST goes high to

charge RT/GT through RC.

When the voltage of RT/GT changes from 0 to VTRT (2.35V for 5V supply), the input signal is

effective, and the correct code will be created by the code detector. After D0~D3 are completely

latched, DV output becomes high. When the voltage of RT/GT falls down from VDD to VTRT

(i.e.., when there is no input tone), DV output becomes low, and D0~D3 keeps data until a next

valid tone input is produced.

By selecting adequate external RC value, the minimum acceptable input tone duration (tACC)

and the minimum acceptable inter-tone rejection (tIR) can be set. External components (R, C) are

chosen by the formula (refer to Figure 5.):

tACC=tDP+tGTP;

tIR=tDA+tGTA;

where tACC: Tone duration acceptable time

tDP: EST output delay time (_L__H_)

tGTP: Tone present time

tIR: Inter-digit pause rejection time

tDA: EST output delay time (_H__L_)

tGTA: Tone absent time


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Application Circuits:

Figure 5 Application Circuits of DTMF Receiver


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ATMEGA 16 microcontroller

Features:

High-performance, Low-power AVR 8-bit Microcontroller

Advanced RISC Architecture

131 Powerful Instructions Most Single-clock Cycle Execution

32 x 8 General Purpose Working Registers

Fully Static Operation

Up to 16 MIPS Throughput at 16 MHz

On-chip 2-cycle Multiplier

Nonvolatile Program and Data Memories

16K Bytes of In-System Self-Programmable Flash

Endurance: 10,000 Write/Erase Cycles

Optional Boot Code Section with Independent Lock Bits

In-System Programming by On-chip Boot Program

True Read-While-Write Operation

512 Bytes EEPROM

Endurance: 100,000 Write/Erase Cycles 1K Byte Internal SRAM

Programming Lock for Software Security

JTAG (IEEE std. 1149.1 Compliant) Interface

Boundary-scan Capabilities According to the JTAG Standard

Extensive On-chip Debug Support

Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG

Interface

Peripheral Features

Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes

One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture


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Mode

Real Time Counter with Separate Oscillator

Four PWM Channels

8-channel, 10-bit ADC

8 Single-ended Channels

7 Differential Channels in TQFP Package Only

2 Differential Channels with Programmable Gain at 1x, 10x, or 200x

Byte-oriented Two-wire Serial Interface

Programmable Serial USART

Master/Slave SPI Serial Interface

Programmable Watchdog Timer with Separate On-chip Oscillator

On-chip Analog Comparator

Special Microcontroller Features

Power-on Reset and Programmable Brown-out Detection

Internal Calibrated RC Oscillator

External and Internal Interrupt Sources

Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby

and Extended Standby

I/O and Packages 32 Programmable I/O Lines

40-pin PDIP, 44-lead TQFP, and 44-pad MLF

Operating Voltages

4.5 - 5.5V for ATmega16

Speed Grades

0 - 16 MHz for ATmega16


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Block Diagram:

Figure 6 Block Diagram of ATMEGA 16 microcontroller


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AVR CPU Core:

Introduction:

This section discusses the AVR core architecture in general. The main function of the CPU core

is to ensure correct program execution. The CPU must therefore be able to access memories,

perform calculations, control peripherals, and handle interrupts.

Architectural Overview:

Block Diagram of the AVR MCU Architecture:

Figure 7 Architectural Overview of ATMEGA 16 microcontrollers


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In order to maximize performance and parallelism, the AVR uses a Harvard architecture with

separate memories and buses for program and data. Instructions in the program memory are

executed with a single level pipelining. While one instruction is being executed, the next

instruction is pre-fetched from the program memory. This concept enables instructions to be

executed in every clock cycle. The program memory is In- System Reprogrammable Flash

memory.

The fast-access Register file contains 32 x 8-bit general purpose working registers with a single

clock cycle access time. This allows single-cycle Arithmetic Logic Unit (ALU) operation. In a

typical ALU operation, two operands are output from the Register file, the operation is executed,

and the result is stored back in the Register file in one clock cycle.

Six of the 32 registers can be used as three 16-bit indirect address register pointers for Data

Space addressing enabling efficient address calculations. One of the these address pointers can

also be used as an address pointer for look up tables in Flash Program memory. These added

function registers are the 16-bit X-, Y-, and Z-register, described later in this section.

The ALU supports arithmetic and logic operations between registers or between a constant and a

register. Single register operations can also be executed in the ALU. After an arithmetic

operation, the Status Register is updated to reflect information about the result of the operation.

Program flow is provided by conditional and unconditional jump and call instructions, able todirectly address the whole address space. Most AVR instructions have a single 16-bit word

format. Every program memory address contains a 16- or 32-bit instruction.

Program Flash memory space is divided in two sections, the Boot program section and the

Application Program section. Both sections have dedicated Lock bits for write and read/write

protection. The SPM instruction that writes into the Application Flash memory section must

reside in the Boot Program section.

During interrupts and subroutine calls, the return address program counter (PC) is stored on the

Stack. The Stack is effectively allocated in the general data SRAM, and consequently the stack

size is only limited by the total SRAM size and the usage of the SRAM. All user programs must

initialize the SP in the reset routine (before subroutines or interrupts are executed). The Stack

Pointer SP is read/write accessible in the I/O space. The data SRAM can easily be accessed

through the five different addressing modes supported in the AVR architecture.


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The memory spaces in the AVR architecture are all linear and regular memory maps.

A flexible interrupt module has its control registers in the I/O space with an additional global

interrupt enable bit in the Status Register. All interrupts have a separate interrupt vector in the

interrupt vector table. The interrupts have priority in accordance with their interrupt vector

position. The lower the interrupt vector address, the higher the priority.

The I/O memory space contains 64 addresses for CPU peripheral functions as Control Registers,

SPI, and other I/O functions. The I/O Memory can be accessed directly, or as the Data Space

locations following those of the Register file, $20 - $5F.

L293D Motor Driver IC

FEATURES:

Featuring Unitrode L293 and L293D Products Now From Texas Instruments

Wide Supply-Voltage Range: 4.5 V to 36 V

Separate Input-Logic Supply

Internal ESD Protection

Thermal Shutdown

High-Noise-Immunity Inputs

Functional Replacements for SGS L293 and SGS L293D

Output Current 1 A Per Channel(600 mA for L293D)

Peak Output Current 2 A Per Channel(1.2 A for L293D)

Output Clamp Diodes for Inductive

Transient Suppression (L293D)


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Description:

The L293 and L293D are quadruple high-current half-H drivers. The L293 is designed to provide

Bidirectional drive currents of up to 1 A at voltages from 4.5 V to 36 V. The L293D is designed

to provide bidirectional drive currents of up to 600-mA at voltages from 4.5 V to 36 V. Both

devices are designed to drive inductive loads such as relays, solenoids, dc and bipolar stepping

motors, as well as other high-current/high-voltage loads in positive-supply applications.

All inputs are TTL compatible. Each output is a complete totem-pole drive circuit, with a

Darlington transistor sink and a pseudo-Darlington source. Drivers are enabled in pairs, with

drivers 1 and 2 enabled by 1,2EN and drivers 3 and 4 enabled by 3,4EN. When an enable input is

high, the associated drivers are enabled and their outputs are active and in phase with their

inputs. When the enable input is low, those drivers are disabled and their outputs are off and in

the high-impedance state. With the proper data inputs, each pair of drivers forms a full-H (or

bridge) reversible drive suitable for solenoid or motor applications.


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On the L293, external high-speed output clamp diodes should be used for inductive

transient suppression.

A VCC1 terminal, separate from VCC2, is provided for the logic inputs to minimize

device power dissipation.

The L293and L293D is characterized for operation from 0C to 70C.

A

B

C

D

+5V

GND

MOTOR

MOTOR

16 8

2

7

10

15

3

6

4 5 12 13

11

14

+9V

L293D IC

Figure 8 Motor Driver Circuit using in Cellphone Controlled Robot


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Block Diagram:

Figure 9 Block Diagram of L293D Motor Driver IC


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APPLICATION INFORMATION:

Figure 10 Two-Phase Motor Driver (L293D)


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SN74LS04

This device contains six independent gates each of which performs the logic INVERT function.

Function Table:


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Voltage Regulator 7805

(3-Terminal 1A Positive Voltage Regulator)

Description:

The KA78XX/KA78XXA series of three-terminal positive regulator are available in the TO

220/D-PAK package and with several fixed output voltages, making them useful in a wide range

of applications. Each type employs internal current limiting, thermal shut down and safe

operating area protection, making it essentially indestructible. If adequate heat sinking is

provided, they can deliver over 1A output current. Although designed primarily as fixed voltage

regulators, these devices can be used with external components to obtain adjustable voltages and

currents.


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Internal Block Diagram:

Figure 11 Internal Block Diagram of voltage regulator


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An actual-size, single-side PCB

Figure 12 CellPhone Control

or cellphone controlled robot and its componen

ed Robot and its component PCB layout

t layout in fig.


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3.5 Circuit Diagram Description (Flow Chart)


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CHAPTER 4

WORKING AND CONSTRUCTION

4.1 Working

In order to control the robot, you need to make a call to the cell phone attached to the robot

(through headphone) from any phone, which sends DTMF tunes on pressing the numeric

buttons. The cell phone in the robot is kept in 'auto answer' mode. (if the mobile does not have

the auto answering facility ,receive the call by 'OK' key on the rover connected mobile and then

made it in hands-free mode.) so after a ring, the cell phone accepts the call. Now you may press

any button on your mobile to perform actions as listed in the table. The DTMF tones thus

produced are received by the cell phone in the robot. These tones are fed to the circuit by headset

of the cell phone. The HT9170 decodes the received tone and sends the equivalent binary

number to the microcontroller. According to the program in the microcontroller, the robot starts

moving, When you press key '2' (binary equivalent 00000010) on your mobile phone, the

microcontroller outputs '10001001' binary equivalent. Port pins PD0, PD3 and PD7 are high. The

high output at PD7 of the microcontroller drives the motor driver (L293D) port pins PD0 and

PD3 drive motors M1 and M2 in forward direction( as per table ).Similarly, motors M1 and M2

move for left turn, right turn, backward motion and stop condition as per (table ).


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4.2 Construction

When constructing any robot, one major mechanical constraint is the number of motors being

used. You can have either a two-wheel drive or a four-wheel drive. Though four-wheel drive is

more complex than two-wheel drive, it provides more torque and good control.

Top view of a four-wheel-drive land rover is shown in Fig.3. The chassis used in this model is a

10 x 18 cm2 sheet made up of par ax. Motors are fixed to the bottom of this sheet and the circuit

is affixed firmly on top of the sheet. A cell phone is also mounted on the sheet as shown in the

picture.

In the four-wheel drive system, the two motors on a side are controlled in parallel. So a single

L293D driver IC can drive the rover. For this robot, beads affixed with glue act as support

wheels.

FRONT VIEW OF HARDWARE

Figure 13 Front View of Hardware


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TOP VIEW OF HARDWARE

Figure 14 Top View of Hardware


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CHAPTER 5

SOFTWARE / TOOL ENVIRONMENT

The software is written in C language and compiled using Code Vision AVR C compiler. The

source program is converted into hex code by the compiler. Burn this hex code into ATmega16

AVR microcontroller.

The source program is well commented and easy to understand. First include the register name

defined specifically for ATmega16 and also declare the variable. Set port A as the input and portD as the output. The program will run forever by using while loop. Under while loop, read

port A and test the received input using switch statement. The corresponding data will output at

port D after testing of the received data.

5.1 Programme Code

#include

Void main (void)

{

Unsigned int k, h;

DDRA=0x00;

DDRD=0XFF;

While (1)

{

k =~PINA;

h=k & 0x0F;

Switch (h)

{

Case 0x02:


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{

PORTD=0x89;

Break;

}

Case 0x08:

{

PORTD=0x86;

Break;

}

Case 0x04:

{

PORTD=0x85;

Break;

}

Case 0x06:

{

PORTD=0x8A;

Break;

}Case 0x05:

{

PORTD=0x00;

Break;

}

}

}

}


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5.2 Hex Code of the Programme

: 100000000C942B000C9400000C9400000C94000045

: 100010000C9400000C9400000C9400000C94000060

: 100020000C9400000C9400000C9400000C94000050

: 100030000C9400000C9400000C9400000C94000040

: 100040000C9400000C9400000C9400000C94000030

: 100050000C9400000000F894EE27ECBBF1E0FBBF2D

: 10006000EBBFE5BFF8E1F1BDE1BD8DE0A2E0BB274C

: 10007000ED938A95E9F780E094E0A0E6ED9301978F

: 10008000E9F7E4E5F0E085919591009761F0A5919D

: 10009000B59105901590BF01F00105900D92019763

: 1000A000E1F7FB01F0CFEFE5EDBFE4E0EEBFC0E626

: 1000B000D1E00C945B00E0E0EABBEFEFE1BBE9B319

: 1000C000E0950E2F1127F801EF70F0709F01F901F4

: 1000D000E230A0E0FA0711F4E9E817C0E830A0E048

: 1000E000FA0711F4E6E811C0E430A0E0FA0711F4D1

: 1000F000E5E80BC0E630A0E0FA0711F4EAE805C035

: 10010000E530A0E0FA0711F4E0E0E2BBD8CFFFCF82

: 00000001FF


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CHAPTER 6

RESULTS AND DISCUSSION

Cell phone acts as a DTMF generator with tone depending upon key pressed. DTMF decoder i.e.

IC HT9170 decodes the received tone and gives binary equivalent of it to the microcontroller.

The controller is programmed such that appropriate output is given to motor driver IC L293D

which will drive the two DC motors connected to it. The concept used for drivin g is differential

drive. So ultimately the two motors rotate according to the key pressed on the keypad of the cell

phone.


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CHAPTER 7

Applications, Further Improvements & Future Scope

7.1Applications

7.1.1Scientific

Remote control vehicles have a 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. The sophistication of these devices has fueled greater debate on

the need for manned space flights and exploration. The voyager I spacecraft is the first craft of

any kind to leave the solar system. The Martian explorers Spirit and Opportunity have provided

continuous data about the surface of Mars since January 3, 2004.

7.1.2 Military and Law Enforcement

Remote controlled vehicles are used in Law enforcement and military engagements because of

many reasons. The exposures to hazards are mitigated to the person who operates the vehicle

from the location of relative safety. They are used by many police department bomb-squads to

defuse or detonate explosives.

Current Unmanned Aerial Vehicles (UAVs) can hover around possible targets until they are

positively identified before releasing their pay load of weaponry. Backpack sized UAVs will

provide ground troops with over the horizon surveillance capabilities.


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7.1.3 Search and Rescue

UAVs play an increased role in search and rescue all over the world. This was demonstrated by

the successful use of UAVs during the 2008 hurricanes that struck Louisiana and Texas in US.

7.1.4 Recreation and Hobby

Small scale remote control vehicles span a wide range in terms of price and sophistication. There

are many types like on-road cars, off-road truck, boats, aero planes and helicopters. Radio-

controlled submarine also exist

7.2 Further Improvements & Future Scope

7.2.1 IR Sensors:

IR sensors can be used to automatically detect and avoid obstacles if the robot goes beyond line

of sight. This avoids damage to the vehicle if we are maneuvering it from a distant place .

7.2.2 Password Protection

Project can be modified in order to password protect the robot so that it can be operated only if

correct password is entered. Either cell phone should be password protected or necessary

modification should be made in the assembly language code. This introduces conditioned access

and increases security to a great extent.


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7.2.3 Alarm Phone Dialer

By replacing DTMF Decoder IC HT9170 by a DTMF Transceiver IC, DTMF tones can be

generated from the robot. So, a project called Alarm Phone Dialer can be built which willgenerate necessary alarms for something that is desired to be monitored (usually by triggering a

delay). For e.g., a high water alarm, low temperature alarm, opening of back window, garage

door etc.

When the system is activated it will call a number of programmed numbers to let the user know

the alarm has been activated. This would be great to get alerts of alarm conditions from home

when user is at work.

7.2.4 Adding A Camera:

If the current land rover is interfaced with a camera (e.g. a web cam) robot can be driven beyond

line-of-sight and range becomes unlimited as GSM networks have a very large range.

.


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CHAPTER 8

CONCLUSION

Conventionally, wireless-controlled robots use RF circuits, which have the drawbacks of limited

working range, limited frequency range and limited control. Use of a mobile phone 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 robots vary vastly, all

robots share the features of a mechanical, movable structure under some form of control. The

control of robot involves three distinct phases: perception, processing and action. Generally, the

preceptors are sensors mounted on the robot, processing is done by the on-board microcontroller

or processor, and the task (action) is performed using motors or with some other actuators.


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REFERENCES

1. Schenker, L(1960), Pushbutton Calling with a Two-Group Voice-Frequency Code, The

Bell system technical journal 39(1): 235-255,ISSN 0005-8580

2. DTMF Tester, Electronics For You Magazine, Edition(June 2003)

http://www.instructables.com

3. http://en.wikipedia.org/wiki/Passive_infrared_sensor

4. http://www.alldatasheet.com

5. http://www.datasheet4u.com

6. http://www.datasheetcatalog.com
http://www.instructables.com/http://en.wikipedia.org/wiki/Passive_infrared_sensorhttp://www.alldatasheet.com/http://www.datasheet4u.com/http://www.datasheetcatalog.com/http://www.datasheetcatalog.com/http://www.datasheet4u.com/http://www.alldatasheet.com/http://en.wikipedia.org/wiki/Passive_infrared_sensorhttp://www.instructables.com/


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APPENDICES

ATmega 16 Microcontroller

Pin Configurations:


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Pin Descriptions:

VCC Digital supply voltage

GND Ground

Port A (PA7 PA0)

Port A serves as the analog inputs to the A/D Converter. Port A also serves as an 8-bit bi

directional I/O port, if the A/D Converter is not used. Port pins can provide internal pull-up

resistors (selected for each bit). The Port A output buffers have symmetrical drive characteristics

with both high sink and source capability. When pins PA0 to PA7 are used as inputs and are

externally pulled low, they will source current if the internal pull-up resistors are activated. The

Port A pins are tri-stated when a reset condition becomes active, even if the clock is not running.

Port B (PB7 PB0)

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).

The Port B output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port B pins are tri-stated when a reset condition becomes active, even

if the clock is not running. Port B also serves the functions of various special features of the

ATmega16.

Port C (PC7 PC0)

Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port C output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port C pins are tri-stated when a reset condition becomes active, even

if the clock is not running. If the JTAG interface is enabled, the pull-up resistors on pins PC5

(TDI), PC3 (TMS) and PC2 (TCK) will be activated even if a reset occurs. Port C also serves the

functions of the JTAG interface and other special features of theATmega16.


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Port D (PD7 PD0)

Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).

The Port D output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port D pins are tri-stated when a reset condition becomes active, even

if the clock is not running. Port D also serves the functions of various special features of the

ATmega16.

RESET

Reset Input. A low level on this pin for longer than the minimum pulse length will generate a

reset, even if the clock is not running. The minimum pulse length is Shorter pulses are not

guaranteed to generate a reset.

XTAL1

Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.

XTAL2Output from the inverting Oscillator amplifier.

AVCC

AVCC is the supply voltage pin for Port A and the A/D Converter. It should be externally

connected to VCC, even if the ADC is not used. If the ADC is used, it should be connected to

VCC through a low-pass filter.

AREF AREF is the analog reference pin for the A/D Converter.


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HT9170 DTMF Decoder IC

Pin Assignment:


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Pin Description:


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Contacts for more Info:-

Kaushal Singh Kiroula (+91 9166464344)

[email protected]

Mohit Sharma

[email protected] (+91 8107772571)

Mohd. Shahbaz Khan


Kapil Sharma

mailto:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]

Cellphone Operated Land Rover (Modi Institute of Tecnology Kota)

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