How to interface a HC-05 Bluetooth Module with AVR ATmega32 microcontroller

HC-05 Bluetooth Module Interfacing with ATmega32

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In this project, we will learn How to interface a HC-05 Bluetooth Module with AVR ATmega32 microcontroller. Here, we will connect the HC-05 Bluetooth and Android Mobile through Bluetooth and we will send data from HC-05 Bluetooth to Android Mobile.

The communication between HC-05 Bluetooth Module and ATmega32 microcontroller takes place through UART serial communication protocol. The ATmega32 microcontroller will send the string “ABLab Solutions” first and then “www.ablab.in” to the HC-05 Bluetooth Module. The HC-05 Bluetooth Module transmits the received strings to the Android Mobile through bluetooth and the Android mobile displays the received strings in the Bluetooth Terminal App window. After sending each string, the microcontroller sends the carriage return and new line character to HC-05 Bluetooth Module. The carriage return and new line are sent to display “ABLab Solutions” and “www.ablab.in” in two different lines in the Bluetooth Terminal App. The ASCII value of carriage return is 0X0D and new line is 0x0A.

Softwares Required

Hardwares Required

Name	Quantity
AVR Trainer Board-100 with ATmega32	1pc
AVR USB Programmer	1pc
12V, 1A DC SMPS Adaptor	1pc
HC-05 Bluetooth Board	1pc
1 to 1 Connector-Female to Female	4pc
10 to 10 FRC Female to Female Connector	1pc

Circuit Diagram

Video

Connection Guide

The step-by-step connection guide for HC-05 Bluetooth Module Interfacing with ATmega32 is as follows

Steps - 1 ( 0f 11 )

Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.
Steps - 2 ( 0f 11 )

Connect the VCC and GND pins of HC-05 Bluetooth Module with the 5V(VCC) and GND header pins of AVR Trainer Board-100 respectively with 1 to 1 Connectors.
Steps - 3 ( 0f 11 )

Connect the TXD and RXD pins of HC-05 Bluetooth Module with PD0 and PD1 pins of PortD header of AVR Trainer Board-100 respectively with 1 to 1 Connectors.
Steps - 4 ( 0f 11 )

Connect the ISP header of AVR Trainer Board-100 with AVR USB Programmer header of AVR USB Programmer with a 10 to 10 FRC Female Connector.
Steps - 5 ( 0f 11 )

Connect the AVR USB Programmer to the PC/Laptop's USB Port directly or with the help of USB AM-FM Cable.
Steps - 6 ( 0f 11 )

Download the HC-05 Bluetooth Module Interfacing ATmega32 Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.
Steps - 7 ( 0f 11 )

Switch on the power with the help of Power Switch of AVR Trainer Board-100.
Steps - 8 ( 0f 11 )

Pair the HC-05 Bluetooth Module with Android Mobile. Default PIN of HC-05 is 1234.
Steps - 9 ( 0f 11 )

Open the Bluetooth Terminal App in the Mobile and Connect the HC-05 Bluetooth Module with it.
Steps - 10 ( 0f 11 )

Reset the AVR Trainer Board-100 using its Reset switch.
Steps - 11 ( 0f 11 )

See the output in the Bluetooth Terminal Window.

Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.

Steps - 1 ( 0f 11 )
Connect the VCC and GND pins of HC-05 Bluetooth Module with the 5V(VCC) and GND header pins of AVR Trainer Board-100 respectively with 1 to 1 Connectors.

Steps - 2 ( 0f 11 )
Connect the TXD and RXD pins of HC-05 Bluetooth Module with PD0 and PD1 pins of PortD header of AVR Trainer Board-100 respectively with 1 to 1 Connectors.

Steps - 3 ( 0f 11 )
Connect the ISP header of AVR Trainer Board-100 with AVR USB Programmer header of AVR USB Programmer with a 10 to 10 FRC Female Connector.

Steps - 4 ( 0f 11 )
Connect the AVR USB Programmer to the PC/Laptop's USB Port directly or with the help of USB AM-FM Cable.

Steps - 5 ( 0f 11 )
Download the HC-05 Bluetooth Module Interfacing ATmega32 Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.

Steps - 6 ( 0f 11 )
Switch on the power with the help of Power Switch of AVR Trainer Board-100.

Steps - 7 ( 0f 11 )
Pair the HC-05 Bluetooth Module with Android Mobile. Default PIN of HC-05 is 1234.

Steps - 8 ( 0f 11 )
Open the Bluetooth Terminal App in the Mobile and Connect the HC-05 Bluetooth Module with it.

Steps - 9 ( 0f 11 )
Reset the AVR Trainer Board-100 using its Reset switch.

Steps - 10 ( 0f 11 )
See the output in the Bluetooth Terminal Window.

Steps - 11 ( 0f 11 )