Interfacing HC-05 with Atmega8

In this post, we will interface bluetooth module (HC-05) with atmega8. Atmega8 is a 28-pin IC and it has three ports viz., PORTB, PORTC and PORTD and it has total 23 gpio pins. It has internal rc oscillator, that is user selectable from  1, 2, 4 or 8 MHz.

We are using 8 Mhz internal rc oscillator.

Compiler Used: GCC

Connection is as follows:

Atmega8                                     BT module

RX            ============>     TX

TX            ============>     RX

GND         ============>     GND

VCC         ============>     VCC

We are using uart at baud rate 9600. Make sure that BT module and atmega8 both have same baud rate.

How to enter AT mode in HC-05 bluetooth module

Using HC-05 in AT mode

Hello guys, In this post we will cover how to change password, name or mode (master or slave) in HC-05 module. 

Things required:

1. Arduino Uno board

2. Jumper wires

3. HC-05

4. Little bit patience :p

Note: Use can USB-TTL instead of arduino uno board. In this case, arduino uno board is simply used as USB-TTL converter.

Steps to follow:

First of all, upload a blank program to arduino.

/* Arduino Program */

void  setup(){

}

void  loop(){

}