How to use bluetooth with 8051

This Project is Suitable for Everyone Including student and Professional

Bluetooth-based relay control using an 8051-based microcontroller involves using Bluetooth communication to remotely control the switching of a relay. Here’s a general overview of the system:

1. Hardware components:

• 8051-based microcontroller board

• HC-05 Bluetooth module

• Relay board

• Power supply

• AC Bulb 230v

• Bulb Holder

• Android based Mobile phone

1. Connections:

• The HC-05 module is connected to the microcontroller’s serial port pins.

• The relay board is connected to the microcontroller’s output pins.

• Power supply connections are made to power the microcontroller and the relay board.

1. Software:

The software for this system involves two main parts:

• Code for the microcontroller to receive commands from the Bluetooth module and switch the relay on or off accordingly.

• An Android application to send Bluetooth commands to the HC-05 module.

1. Operation:

• The Android application sends Bluetooth commands to the HC-05 module.

• The HC-05 module receives the commands and sends them to the microcontroller.

• The microcontroller interprets the commands and switches the relay on or off based on the command received.

Overall, this system provides a wireless means of controlling a relay, which can be useful for a variety of applications, such as home automation or industrial control systems.

#include<reg51.h> sbit X = P1^0; // connect relay1 to P1.0sbit Y = P1^1; // connect relay2 to P1.1void delay(unsigned int count){ unsigned int i; while(count) { i = 115; while(i > 0) i--; count--; }}/*Uart initialization function, call this function by passing a valid baud rate value to initialize UARTcurrently Supported Baud Rates are 9600,4800,2400,1200*/void uart_init(unsigned int baud){ unsigned int a = 9600, b = 4800, c = 2400 , d = 1200; TMOD = 0x20; // timer 1 8-bit auto-reload SCON = 0x50; // Tx and Rx enable if(baud == a) { TL1 = 0xFD; TH1 = 0xFD; } if(baud == b) { TL1 = 0xFA; TH1 = 0xFA; } if(baud == c) { TL1 = 0xF4; TH1 = 0xF4; } if(baud == d) { TL1 = 0xE8; TH1 = 0xE8; } TR1 = 1; // Start timer}/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Trasmitting 8 bit dataSend 8-bit data while callinjg this functionto send it over UART~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/void uart_write(unsigned char value){ SBUF = value; while(!TI); TI = 0;}/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Receiving 8-bit data~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/char uart_read(){ while(!RI); RI = 0; return(SBUF);}/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Xmitting String~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/void uart_write_text(char *str){ unsigned char i=0; while(str[i]) uart_write(str[i++]);}/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Read a particular number of bytes in a string~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/void uart_read_text(void *buff, unsigned int len){ unsigned int i; for(i=0;i<len;i++) { ((char*)buff)[i]=uart_read(); }}/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Echoing received data~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/void uart_echo(){ uart_write(uart_read());}void main(){ unsigned char byte; uart_init(9600); //P2 = 0x00; X=0; Y=0; delay(100); uart_write_text("Welcome"); while(1) { byte = uart_read(); // receive a byte serially, wait 1 second and again send it back if(byte == 'A') { X = 1; } if(byte == 'a') { X = 0; } if(byte == 'B') { Y = 1; } if(byte == 'b') { Y = 0; } delay(100); // little delay so that user can recognize it uart_write(byte); // resend received data over UART }}

for more learning of Python Raspbery Pi, Internet of things , ESP 32 ,and Arduino click on courses