A wireless technology used to exchange data over short distance.
- It uses short wave length UHF radio wave.
- Operated at a frequencies between 2400 and 2483.5Mhz.
- Use to create personal area network.
- It is alternate to RS232 data cable.
- Bluetooth is more useful to transfer data with two or more devices in low bandwidth situations.
- Bluetooth is also used to transfer sound data which as application in Mobile Phones.
Paring System:
- To Transfer data between two devices , it must synchronized by paring.
- Paring done link key.
- When both devices have same link key then it said to be paired.
Data Transfer:
- Bluetooth Transfer data by dividing the transmiting data into packets.
- Transmit each packet on one of 79 designated Bluetooth channels.
Hardware Required
- Bluetooth Module.
- 8051 MicroController.
Bluetooth Pinout
- Vin= +5V.
- Tx= Rx of Microcontroller.
- Rx= Tx of Microcontroller.
- Gnd= Ground.
Circuit
Virtual Circuit
Code
#include <REGX51.H>
unsigned int i,j;
unsigned int l=0;
unsigned char input;
void serial0() interrupt 4
{
if(RI==1)
{
input=SBUF;
RI=0;
}
}
void main ( void )
{
TMOD=0x20; // set timer1 mode 2
TH1=0xFD; // baud rate 9600
IE=0x90; //enable serial interrupt
SCON=0x50; // config scon to send & recive with mode1
TR1=1; // start timer
while(1)
{
if(input==1)
{
P0_1=0;
}
else if(input==0)
{
P0_1=1;
}
}
}
