Design of infrared electronic password lock based on 51 single chip microcomputer

This design includes two 51 single-chip microcomputers and an infrared component IRLINK that comes with proteus to simulate infrared communication: 1) A single-chip microcomputer simulates sending password signals;         
2) A single-chip microcomputer receives password signals and controls the opening or closing of the lock through the electromagnetic coil;
3) Use the transmitter of the infrared component IRLINK that comes with proteus to simulate the first single-chip microcomputer transmitting infrared signals;
4) Use the receiver of the infrared component IRLINK that comes with proteus to simulate receiving infrared signals and convert them into electrical signals through photoelectric conversion and send them to the second single-chip microcomputer (controller of infrared electronic password lock)

The following is the design of the circuit diagram:

Circuit diagram design

The following is part of the infrared communication program

#include "reg52.h" //This file defines some special function registers of the microcontroller

typedef unsigned int u16; //declare and define the data type

typedef unsigned char u8;

sbit LOCK=P2^0; //Unlock control interface

sbit IRIN=P3^2; //Interface between infrared communication and MCU, controlled by external interrupt 0

u8 IrValue[4]; //Actually only 4 bits are used

u8 code1=0x00; //Store the original lock password: 00000000;

u8 code2=0xff; //Store the original unlocking password: 111111111;

u8 Time; //Store intermediate variables

/***********************************************************************************

* Function name: delay

* Function: Delay function, when i=1, the delay is about 10us

***********************************************************************************/

void delay(u16 i)

{

        while(i--);        

}

/***********************************************************************************

* Function name: IrInit()

* Function: Initialize infrared reception

* Input : None

* Output: None

***********************************************************************************/

void IrInit()

{

        IT0=1; //Falling edge trigger

        EX0=1; //Enable interrupt 0

        EA=1; //Open the general interrupt

        IRIN=1; //Initialize port

}

/***********************************************************************************

* Function name: main

* Function: Main function

* Input: None

* Output: None

***********************************************************************************/

void main()

{        

        IrInit();

        while(1)

        {        

          if(IrValue[2] == code1) LOCK=1; //Close the door

          if(IrValue[2] == code2) LOCK=0; //Open the door

        }               

}

/***********************************************************************************

* Function name: ReadIr()

* Function: Interrupt function to read infrared value

* Input : None

* Output: None

***********************************************************************************/

void ReadIr() interrupt 0

{

        u8 j,k;

        u16 err;

        Time=0;                                         

         . . . . .