1. USING TV REMOTE AS A CORDLESS MOUSE FOR THE COMPUTER
Project Title
USING TV REMOTE AS A CORDLESS MOUSE FOR THE COMPUTER
Under the Guidance of
Submitted by

2. ABSTRACT
A typical TV remote sends coded infrared data that is read by an IR sensor duly interfaced to a microcontroller and then to the com port of a PC.
This IR code is traditionally RC5 code as followed by remotes from PHILIPS.
The same data is then burnt to a microcontroller the output of which shall drive desired operation through serial port connection as conventionally performed by the PC Mouse.
Up - down, right - left buttons of the TV remote can be used for as similar operation to that of a mouse and remotely thus achieving the same function.

3. BLOCK DIAGRAM

4. HARDWARE REQUIREMENTS
POWER SUPPLY
MICROCONTROLLER (AT89S52/AT89C51)
TSOP1738
MAX232
DB9 CONNECTOR
LED
1N4007
RESISTORS
CAPACITORS

5. POWER SUPPLY Bridge rectifier 5v Regulator 230 V AC 50 Hz 5V DC
Filter(470µf)
12V step down
transformer

6. It is a smaller computer Has on-chip RAM, ROM, I/O ports...
MICROCONTROLLER
It is a smaller computer
Has on-chip RAM, ROM, I/O ports...
RAM
ROM
I/O Port
Timer
Serial COM Port
Microcontroller
CPU
A single chip

7. INTERNAL STRUCTURE OF A MICRO CONTROLLER-AT89S52/51
CPU
On-chip RAM
On-chip ROM for program code
4 I/O Ports
Timer 0
Serial Port
OSC
Interrupt Control
External interrupts
Timer 1
Timer/Counter
Bus Control
TxD RxD
P0 P1 P2 P3
Address/Data
Counter Inputs

8. Features of AT89S51/52 Compatible with MCS®-51 Products
8K Bytes of In-System Programmable (ISP) Flash Memory
Endurance: 10,000 Write/Erase Cycles
4.0V to 5.5V Operating Range
Fully Static Operation: 0 Hz to 33 MHz
256 x 8-bit Internal RAM
32 Programmable I/O Lines
Three 16-bit Timer/Counters
Eight Interrupt Sources
Full Duplex UART Serial Channel
Interrupt Recovery from Power-down Mode
Watchdog Timer
Dual Data Pointer

9. Pin Description

10. MAX 232
The MAX232 is an integrated circuit that converts signals from an RS-232serial port to signals suitable for use in TTL compatible digital logic circuits.
The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals .
When a MAX232 IC receives a TTL level to convert, it changes a TTL Logic 0 to
between +3 and +15V, and changes TTL
Logic 1 to between -3 to -15V, and vice
versa for converting from RS232 to TTL.

11. DB9 CONNECTOR
The DB9 (originally DE-9) connector is an analog 9-pin plug of the D-Sub miniature connector family (D-Sub or Sub-D).

12. TSOP 1738 RECEIVER PIN DIAGRAM
It’s a standard IR remote control
receiver
supporting all major transmission codes
Pin1 – Connected to Ground
Pin2 – Connected to Vcc
Pin3 – Output Pin
In Between 1st Pin and 2nd Pin we have
to connect one Capacitor
TSOP 1738 Receives 14—bit of data

13. TSOP 1738 FEATURES Photo detector and preamplifier in one package
Internal filter for PCM frequency
TTL and CMOS compatibility
Output active low
Low power consumption
High immunity against ambient light
Continuous data transmission possible (up to 2400 bps)
Suitable burst length .10 cycles/burst

14. Working of project
The project uses an IR receiver such as TSOP1738 that responds to only specific frequency of 38 kHz
A standard TV remote that delivers infrared codes at 38 kHz is thus received by the TSOP receiver feeding a 14 bit data so emitted from the remote to the controller through receiver. The program is so returned that it recognizes the 14 bit data relating to a particular number being pressed at the remote.
Here the channel ON & OFF buttons and volume low to volume high buttons of the TV remote buttons are used for sending specific 14 bit data to pin – 13 of port 3.3.
Software used at the PC receives these commands the serial port being connected to the MC through MAX232, RS232 interface. Thus the TV remote works like a mouse from a distance

15. Soft ware Requirements
Keil an ARM Company makes C compilers, macro assemblers, real-time kernels, debuggers, simulators, integrated environments, evaluation boards, and emulators for ARM7/ARM9/Cortex-M3, XC16x/C16x/ST10, 251, and 8051 MCU families.
Compilers are programs used to convert a High Level Language to object code. Desktop compilers produce an output object code for the underlying microprocessor, but not for other microprocessors.

16. i.e the programs written in one of the HLL like ‘C’ will compile the code to run on the system for a particular processor like x86 (underlying microprocessor in the computer).
For example compilers for Dos platform is different from the Compilers for Unix platform  So if one wants to define a compiler then compiler is a program that translates source code into object code.

17. BIBILOGRAPHY
“The Microcontroller and Embedded systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi , Pearson Education.
ATMEL 89S52 Data Sheets.

18. THANKYOU