Production of power carrier communication switch circuit based on 51 microcontroller

1. Schematic diagram:

2. C program source code

/*

This program has been debugged and run by me personally. If you have any questions, please contact

QQ: 286288986

*/

#include //Predefined header file

#define uchar unsigned char //Macro definition

sbit keyin=P3^3; //Key definition

sbit LED=P3^5; //Indicator light definition

uchar a; //Receive data register

void main() //main function

{

keyin=1; //Set the key port to 1

led=1; //turn off the led light

TMOD=0x20; //Select mode 2 in timer/counter 1

SP=0x60; //Set the heap extraction address

TH1=0xfd; //Baud rate 9600bit/s

TL1=0xfd;

SCON=0x50; //Serial communication mode 2, allowing sending and receiving

TR1=1; //Start the counter

while(1) //Loop

{

if(keyin==0) //Determine whether the key is pressed, if so, process the key

{

SBUF=0x00; //Receive data processing

while(TI==0); //Clear the receive flag after sending

TI=0;

}

if(RI==1) //Whether to receive

{

RI=0; //Clear the reception flag after receiving

a=SBUF; //Read received data

if(a==0) //Judge whether the received data is correct

{

if(led==1) //Invert the correct LED light

led=0;

else

led=1;

}

}

}

}

3. Assembly program

/*

This program has been debugged by me personally. If you have any questions while studying,

QQ: 286288986

*/

ORG 00H

JMP START //Start

ORG 10H //Start address

START:

MOV SP,#60H //Set the heap address

MOV SCON,#50H //Serial communication mode 2, allowing sending and receiving

MOV TMOD,#20H //Select mode 2 in timer/counter 1

MOV TH1,#0FDH //Baud rate 9600bit/s

MOV TL1,#0FDH

SETB TR1 //Start the counter

SETB P3.3 //Switch input port is set to 1

SETB P3.5 //LED display off

SCAN:

JB RI,UART //Determine whether to receive

JNB P3.3,KEYIN //Determine whether the key is pressed, if so, process the key

JMP SCAN //Not key scan

KEYIN:

MOV A,#5AH //Send data into A

MOV SBUF,A //Send data

WAIT: // Waiting to send

JBC TI,SCAN //Clear the TI flag after sending

JMP WAIT

UART: //Receive data processing

MOV A,SBUF

CJNE A,#5AH,ERROR //The simple address code is set to 5AH, the user can define it at will

CLR RI //Clear the receive flag bit

CPL P3.5 //Light up

ERROR:

JMP SCAN //Return to scan

END