Bluetooth Interfacing With 8051

Bluetooth Interfacing with 8051 

What is Bluetooth?

Bluetooth is a standardized protocol for sending and receiving data via a 2.4GHz wireless link.

It's a secure protocol, and it's perfect for short-range, Low-cost, Low-power, wireless transmission between electronic devices. 

Image of Bluetooth(HC-05 module):-

Connection of Bluetooth module With Arduino.

Pin 1.  Vcc:- It is connected to the 5v pin.

Pin 2. GND:- It is connected to the ground pin. 

Pin 3. TX:-  It is used to transmit the serial data and is connected to the RX pin of 8051 Microcontroller.

Pin 4. RX:- It is used to receive the serial data and is connected to the TX pin of the 8051 Microcontroller.

Task 1: To display a message on a Serial monitor using Bluetooth.

Code:-

#include<reg51.h>

void uart_begin();

void transfer(unsigned char a);

unsigned char receive();

void recstr(unsigned char d[]);

void str(unsigned char b[]);

void main()

{

        uart_begin();

transfer(receive());

while(1);

}

void uart_begin()

{

SCON=0x50;//usingg mode1 and enable port to high to receive dataa

TMOD=0x20;//to turn on timer 1 and mode2

TH1=0xFD;//baud rate 9600

TR1=1;// turn on timer1

}

void transfer(unsigned char a)

{

SBUF=a;// store the character in empty registerr

while(TI==0);//wait till flag turns to 1

TI=0;// clear again

}

unsigned char receive()

{

while(RI==0);

RI=0;

return SBUF;

}

void str(unsigned char b[])

{

unsigned int i;

for (i=0;b[i]!='\0';i++)

{

transfer(b[i]);

}

}