tapu
Full Member level 4
Data transmition serielly by by 8051 through rf module.
Dear All,
I want to transmit data serielly by using Rf module 433mhz.I have made circuit as follow in proteus.As i press key in transmitter side then data is not seen in reciever 8051 port.pls chk & help.
Thks,
Tepu
Transmitter code:
Reciever code:
Dear All,
I want to transmit data serielly by using Rf module 433mhz.I have made circuit as follow in proteus.As i press key in transmitter side then data is not seen in reciever 8051 port.pls chk & help.
Thks,
Tepu
Transmitter code:
Code:
//-----------------Program for wireless Home Automation using cheap ass 413MHz RF module
//-----------------Target controller family: 8051 <works for any 8051 family with minimal or no modifications>
//-----------------Programmer: Moses Okoroafor
//-----------------Company: Pearl Electronics Nigeria.
//-----------------Date started: 27/04/2017
#define OFF 1
#define ON 0
#include <REGx051.H>
//-----------PORT TO VARIABLE ASSIGNMENT--------------------------
sbit BUT1 = P3^2;
sbit BUT2 = P3^3;
sbit BUT3 = P3^7;
sbit LED1 = P3^5;
sbit LED2 = P3^4;
//-------------PROTOTYPE DECLARATION-------------------------------
void delay(unsigned int ms);
void UART_Init();
void UART_TxChar(char ch);
void transmit(int datum);
bit i,j,k;
//-------------MAIN PROGRAM STARTS HERE----------------------------
void main()
{
i = j = k = 1;
EA = 0;
P1 = 0X3F; P3 = 0XFF; // shows '0' on the 7 seg on startup
delay(300);
LED1 = LED2 = ON;
delay(1000);
LED1 = LED2 = OFF;
delay(100);
UART_Init();
while(1)
{
if (!BUT1) //button for one light
{delay(30);
if(!BUT1)
{
j = ~j;
if(j==0)
{ transmit(0x01); LED1 = ON; if(k==0) P1 = 0X5b; else P1 = 0x06;} //when bits are 0, lights come ON
else {transmit(0x09);LED1 = OFF; if(k==1)P1 = 0X3F; else P1 = 0x06;}
delay(300);
}
}
if (!BUT2) //button for the second light
{delay(30);
if(!BUT2)
{
k = ~k;
if(k==0) {transmit(0x03); LED2 = ON; if(j==0)P1 = 0X5B; else P1 = 0X06;} //lights ON
else {transmit(0x06); LED2 = OFF; if(j==0)P1 = 0x06; else P1 = 0X3F;}
delay(300);
}
}
if (!BUT3) // reset
{delay(30);
if(!BUT3)
{
i = ~i;
if(i==0) {transmit(0x02); LED1 = LED2 = ON; }
else {transmit(0x0F); LED1 = LED2 = OFF;}
delay(300);
}
}
}
}
//---------------FUNCTION BODY DEFINITION--------------------------------------
void delay(unsigned int ms){ //generate one millisecond delay
unsigned int i,j;
for (i=0; i<ms; i++)
for (j=0; j<=120; j++);}
void UART_Init(){
TMOD |= 0X20; // Timer 1 in mode 2
TH1=-24; // Baud rate of 1200
SCON = 0X50; //Asynchronous 8-bit data
TR1 = 1; // Turn ON the timer
}
void UART_TxChar(char ch){
SBUF=ch; // Load transmitted data to be transmitted.
while(TI==0); // Wait till data is transmitted
TI=0; //Clear the transmit flag.
}
void transmit(int datum){
int i = 0;
int start = 0x55; // Create a variable name START
int addr = 0x8E; // Create a variable name ADDR
int chksum = (addr+datum); // Create a variable name CHKSUM
for (; i<5; i++)
{
UART_TxChar(start); // Transmit the content of START
UART_TxChar(datum); // Transmit DATUM
UART_TxChar(addr); //Transmit ADDR
UART_TxChar(chksum); // Transmit CHKSUM
delay(2); //2ms delay
}
}Reciever code:
Code:
//-----------------Program for wireless Home Automation using cheap ass 413MHz RF module
//-----------------Target controller family: 8051 <works for any 8051 family with minimal or no modifications>
//-----------------Programmer: Moses Okoroafor
//-----------------Company: Pearl Electronics Nigeria.
//-----------------Date started: 27/04/2017
#define OFF 1
#define ON 0
#include <REGX52.H>
//-----------PORT TO VARIABLE ASSIGNMENT--------------------------
sbit LED1 = P1^0;
sbit LED2 = P1^1;
//-------------PROTOTYPE DECLARATION-------------------------------
void delay(unsigned int ms);
void UART_Init();
char UART_RxChar();
void receive();
//-------------MAIN PROGRAM STARTS HERE----------------------------
void main()
{
LED1 = LED2 = ON;
delay(1000);
LED1 = LED2 = OFF;
delay(100);
UART_Init();
while(1)
{
receive();
}
}
//---------------DEFINITION OF FUNCTIONS----------------------------------
void delay(unsigned int ms){ //generate one millisecond delay
unsigned int i,j;
for (i=0; i<ms; i++)
for (j=0; j<=120; j++);}
void UART_Init(){
TMOD |= 0X20; // Timer 1 in mode 2
TH1=-24; // Baud rate of 1200
SCON = 0X50; //Asynchronous 8-bit data
TR1 = 1; // Turn ON the timer
}
char UART_RxChar()
{
char ch;
while(RI==0);
ch = SBUF;
RI=0;
return(ch); // Return the received character.
}
void receive() // Receive procedures
{
int start; // create variable named start
int addr; // create variable named addr
int datum; // create variable named datum
int chksum; // create variable named chksum
while(1) // Do an infinite loop
{
{ start = UART_RxChar(); // Store received UART byte into the variable "start"
if (start == 0x55) // if start is equal to 0x55 , Start Byte
{
SBUF =0; //clear SBUF
datum = UART_RxChar(); //Next received byte becomes the data
SBUF =0; //clear SBUF
addr = UART_RxChar(); // Store received UART byte into the variable "addr"
SBUF =0; //clear SBUF
chksum = UART_RxChar();
if (chksum == (datum+addr)) //if chksum is equal to datum+addr then
{
switch(datum)
{
case (0x01): { LED1 = ON; } break;
case (0x02): { LED1 = LED2 = ON;} break;
case (0x03): { LED2 = OFF;} break;
case (0x0F): { LED1 = LED2 = OFF;} break;
case (0x09): { LED1 = OFF; } break;
case (0x06): { LED2 = ON; } break;
}
} //endif for switch statement
} //endif
} //endif
}
}
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