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

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.

BLOCK DIAGRAM

HARDWARE REQUIREMENTS POWER SUPPLY PIC16F877A TSOP1738 MAX232 DB9 CONNECTOR LED 1N4007 RESISTORS CAPACITORS

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

PIC (PIC16F877A) High-Performance RISC CPU: Only 35 single-word instructions. All single-cycle instructions except for program branches, which are two cycle. Operating speed: DC – 20 MHz clock input DC – 200 ns instruction cycle Up to 8K x 14 words of Flash Program Memory, Up to 368 x 8 bytes of Data Memory (RAM), Up to 256 x 8 bytes of EEPROM Data Memory. Pin out compatible to other 28-pin or 40/44- pin, PIC16CXXX and PIC16FXXX microcontrollers.

Special Microcontroller Features: 100,000 erase/write cycle Enhanced Flash program memory typical. 1,000,000 erase/write cycle Data EEPROM memory typical. Data EEPROM Retention > 40 years. Self-reprogrammable under software control. In-Circuit Serial Programming™ (ICSP™) via two pins. Single-supply 5V In-Circuit Serial Programming. Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation. Programmable code protection. Power saving Sleep mode. Selectable oscillator options. In-Circuit Debug (ICD) via two pins.

Peripheral Features: Timer0: 8-bit timer/counter with 8-bit prescaler. Timer1: 16-bit timer/counter with prescaler, can be incremented during Sleep via external crystal/clock. Timer2: 8-bit timer/counter with 8-bit period register, prescaler and postscaler. Two Capture, Compare, PWM modules - Capture is 16-bit, max. resolution is 12.5 ns - Compare is 16-bit, max. resolution is 200 ns - PWM max resolution is 10-bit Synchronous Serial Port (SSP) with SPI™ (Master mode) and I2C™ (Master/Slave). Universal Synchronous Asynchronous Receiver Transmitter (USART/SCI) with 9-bit address detection. Parallel Slave Port (PSP) – 8 bits wide with external RD, WR and CS controls (40/44-pin only). Brown-out detection circuitry for Brown-out Reset (BOR).

PIN DIAGRAM OF PIC16F877

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.

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).

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

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

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 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

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