IR transmitter using AT89C2051

Hello dear friends
If you are trying to design an IR transmitter very similar to your TV remote control. I can help you in achieving this task. Here is program and circuit diagram. it use pin 3.3 (pin 7) of micro controller. Use the given simple program and check it from oscilloscope that it will transmit modulated 38KHz signal.
Circuit diagram is given below

Here is program you can run it using software for assembly language and then create file. After that burn hex file in your microcontroller.

;IR Transmitter using 89c2051

Program

ORG 0000H

Start:

IR EQU P3.3          ;IR trx CONNECTED TO THIS PIN

 

MOV TMOD,#00010001B ; TIMER-0, MODE 1 TIMER-1, MODE 1

sjmp MAIN

;--------------------------;-------------------------------------

;--------------------------;-------------------------------------

ONE:

MOV    TL1,#0CAH ;LOWER BYTE 1.728 MSEC

MOV    TH1,#0F9H ;UPPER BYTE

SETB  TR1

HERE:

MOV    TL0,#0F4H ;LOWER BYTE 38 KHZ

MOV    TH0,#0FFH ;UPPER BYTE

SETB  TR0

CPL   IR

JNB  TF0,$

CLR   TF0

JNB   TF1,HERE

CLR   TF1

Clr IR

RET

;--------------------------;-------------------------------------

;--------------------------;-------------------------------------

;--------------------------;-------------------------------------

;--------------------------;-------------------------------------

ZERO:

MOV    TL1,#0CAH ;LOWER BYTE 1.7728 MSEC

MOV    TH1,#0F9H ;UPPER BYTE

SETB  TR1

SetB  IR

JNB   TF1,$

CLR   TF1

Clr IR

RET

;--------------------------;-------------------------------------

;--------------------------;-------------------------------------

;--------------------------;-------------------------------------

;--------------------------;-------------------------------------

MAIN:

Acall ONE

Acall ZERO

Sjmp MAIN

;--------------------------;-------------------------------------

;--------------------------;-------------------------------------

END