DISH ANTENNA CONTROL USING TV REMOTE

DISH ANTENNA POSITION CONTROL
USING TV REMOTE
8/5/2017DISH ANTENNA POSITION CONTROL
Sixth Semester Mini Project
By
Group No : 05
ARJUN K. P.
Roll No. 14
ALEN ALEX
Roll No. 11
SIDHEEQUE N.
Roll No.04
RIJITH M.
Roll NO.23
AKHIL ASHOK
Roll No.39
SANJAY O. P.
Roll No.25
B. Tech. in Electronics and Instrumentation Engineering
Department of EIE
College of Engineering, Vadakara
On
04-04-2017

OUTLINE
2
• AIM
• INTRODUCTION
• BLOCK DIAGRAM & EXPLANATION
• CIRCUIT DIAGRAM
• RC5 PROTOCOL OF TV REMOTE
• HARDWARE REQUIREMENT & ESTIMATION
• WORKING
• INTERFACING OF MOTOR WITH L293D

CONTINUED….
3
• SOFTWARE REQUIREMENTS
• CREATING A NEW PROJECT IN KEIL
• CONCLUSION
• FINAL VIEW
• APPLICATION
• FUTURESCOPE
• REFERENCE

AIM
4
To design a dish antenna position control using TV Remote

INTRODUCTION
5
• The project is designed to develop a dish positioning system which can
be operated by using a conventional TV remote.
• An electronic dish position control system is made up of two motors
that enable the dish to rotate both in horizontal and vertical direction,
remotely controlled by infrared means.
• One IR sensor is used to receive the remote commands which are fed to
microcontroller that decodes the data to rotate the motor in the desired
direction via motor driver IC.
• The TV remote acts as a transmitter whose data is received by an IR
reciever which is interfaced to a microcontroller of 8051 family.

BLOCK DIAGRAM
6

CIRCUIT DIAGRAM
7

BLOCK DIAGRAM EXPLANATION
8
• The circuit uses standard power supply comprising a step down
transformer from 230v to 12v.
• A bridge rectifier that delivers a pulsating dc.
• The output is then filtered by an electrolytic capacitor of about 47µf.
• It is irrespective of input dc varying from 9v to 14v.
• IC LM7805 is used to get a regulated 5v constant from the filtered dc
output.
POWER SUPPLY

MICRO CONTROLLER AT89C51
9
• AT89C51 is an 8-bit microcontroller and belongs to atmel’s 8051
Family.
• ATMEL 89C51 has 4KB of flash programmable and erasable read
only memory (PEROM) and 129bytes of RAM.It can be erased and
program to a maximum of 1000 times.

L293D Motor Driver IC
10
• L293D is a typical Motor driver or Motor Driver IC which allows DC
motor to drive on either direction.
• It is a 16-pin IC which can control a set of two DC motors
simultaneously in any direction.
• It works on the concept of H-bridge. H-bridge is a circuit which allows
the voltage to be flown in either direction.
• In a single L293D chip there are two h-Bridge circuit inside the IC
which can rotate two dc motor independently.
• There are two Enable pins on l293d. Pin 1 and pin 9, for being able to
drive the motor, the pin 1 and 9 need to be high. For driving the motor
with left H-bridge you need to enable pin 1 to high. And for right H-
Bridge you need to make the pin 9 to high. If anyone of the either pin1
or pin9 goes low then the motor in the corresponding section will
suspend working.

CONTINUED …..
11
BLOCK DIAGRAM & PINOUT DIAGRAM

GEARED MOTOR
12
DIAGRAM

CONTINUED…
13
• A gear motor adds mechanical gears to alter the speed/torque of the
motor for an application.
• Usually such an addition is to reduce speed and increase torque.
• Basically it operates in 12 volts.
• Gear motors are commonly used in commercial applications where a
piece of equipment needs to be able to exert a high amount of force in
order to move a very heavy object.
• The output speed of the rotor is reduced through a series of large gears
until the rotating, RPM speed, of the final gear is very low.

TSOP 1738 RECIVER
14
DIAGRAM

CONTINUED….
15
• Photo detector and preamplifier in one package.
• TTL and CMOS compatibility.
• Output actively low.
• Low power consumption.
• TSOP 1738 is used here so it recieves the signal of frequency 38KHZ from
the IR transmitter and worked corresponding to the code pressed.
TSOP FEATURES

RC5 PROTOCOL OF TV REMOTE
16
Typical pulse train of RC-5 message

CONTINUED…
17
• 2 start bits,1 toggle bit,5 bit address and 6 bit command
• Carrier frequency of 38kHz
• Constant bit time of 1.778ms (64 cycles of 38 kHz)

HARDWARE REQUIREMENTS & ESTIMATION
18
Component Qty Price
TRANSFORMER 12-0-12 1 130
MOTOR DRIVER IC L293D 1 105
TSOP 1738 RECIVER 1 93
MICROCONTROLLER AT89C51 1 75
MOTOR 2 400
CAPACITOR & RESISTOR 14 20
RECTIFIER 1 20
REGULATOR 7805 1 10
CRYSTAL OSCILATOR 11.082 1 20
REMOTE 1 200
TOTAL 1070

WORKING
19
• Dish Positioning System uses two geared motors duly interfaced from
Pin 11, 14 & 3, 6 of motor driver IC (L293D).The motors are so mounted
for the dish such that independent operation of each motor can make
the dish rotate in a position to any solid angle in x, y, z plane.
Conventional T.V. remote outputs infra red codes. A standard TV
remote that delivers infrared codes at 38KHz is thus received by the
TSOP receiver feeding a 14 bit data so emitted from the remote tothe
controller through receiver. The program is so written that it recognizes
the corresponding 14 bit data relating to a particular number being
pressed at the remote.

INTERFACING OF MOTOR WITH L293D
20

SOFTWARE REQUIREMENTS
21
• Keil compiler
• Language :Embedded C or Assembly language
KEIL COMPILER
• Keil is an ARM Company makes C compilers
• Keil development tools for the 8051 Microcontroller Architecture
support every level of software developer from the professional
applications engineer to the student just learning about embedded
software development.
• Compilers are programs used to convert a High Level Language to
object code.

CREATING A NEW PROJECT IN KEIL
22
• Select Project - New Project
• Select a directory and enter the name of the project file.
• Select Project - Select Device and select an 8051, 251, or C16x/ST10
device from the Device Database™
• Create source files to add to the project.
• Select Project - Targets, Groups, Files. Add/Files, select Source Group1,
and add the source files to the project
• Select Project - Options and set the tool options. Note when you select
the target device from the Device Database™ all special options are set
automatically. You typically only need to configure the memory map of
your target hardware. Default memory model settings are optimal for
most applications.
• Select Project - Rebuild all target files or Build target.

CONCLUSION
23
The position of the dish is controlled by using the IR means
i.e., using remote control the position of dish is adjusted
with the help of geared motors to get the maximum
reception of signal.

FINAL VIEW
24

APPLICATION
25
 The position of dish is used in DTH were the signals are received
directly from satellite.
 The dish position control system is used on the top of cars where
the media access signals.
 The position of antenna is used in GPS tracking system.

FUTURE SCOPE
26
 Positioning of dish can be implemented using RF means where
the dish position can be adjusted very efficiently
 Using RF transmission the dish position can be controlled from a
distance of 200meters.

REFERENCE
27
1) C and the 8051: Hardware, Modular Programming, and
Multitasking
by Tom Schultz
2) https://electrosome.com/interfacing-dc-motor-8051-keil-c-
at89c51
3) forum.electronicsforu.com/forum/...work/the.../8051/1162-ir-
interfacing-with-8051
4) http://www.electronicshub.org/interfacing-dc-motor-8051-
microcontroller/

THANK YOU

DISH ANTENNA CONTROL USING TV REMOTE

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