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To make this project you will require the following items.

S.No. Item Image
1

28 PIN AVR Dev Board

Contains the core AVR circuit including 5v regulator, reset, ISP.

AVR Development Board
2 8 LED Board 8 led board
3

Bluetooth Module

Provide bluetooth communication.

bluetooth module
4

Single Pin Female to Female Burg Wires

Used to interconnect the boards

 

Burg Wires
5

USB AVR Programmer

To upload the program to the development board.

USB AVR Programmer

Connecting Bluetooth Module with Development Board

The Bluetooth module has seven interface pins of which two are NC (not connected) pins. The table below shows how you can interface with it our low cost AVR development board.

Bluetooth Module Dev Board
GND GND
RST PD2
TX PD0
RX PD1
NC  
NC  
+5V IN VCC

Connecting Output Indicator LEDs

For initial testing purpose we will use LEDs to indicate the state of four loads. Once the testing is successfully completed then you can replace the LEDs with relays or triacs that can actually control the AC mains loads like light bulbs or fans. The load control outputs are available on the pins PD7, PB0, PB1, PB2

8 led board

These are the only two module required to build this project. One more thing that you need is two bi-colour LEDs that will indicate the status of system. Please refer to the schematic for more details. After the connections are complete, download and burn the hex file for this project using USB AVR Programmer. Please refer to this video for the steps.

Schematic

Circuit diagram for Bluetooth control of appliances

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