Home Automation System Using Bluetooth

8/11/2019 Home Automation System Using Bluetooth

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PGA based

Home Automation

System using Bluetooth


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Contents at a Glance

ABSTRACT ....................................................................... 3

BLOCK DIAGRAM ............................................................. 4

Home Section .............................................................................................. 4

Mobile Section ............................................................................................ 4

Introduction .................................................................... 5

Bluetooth home automation mobile software ................. 7

Hardware design and development ................................. 7

Tool required: .................................................................. 8

Source Code .................................................................... 8

Conclusion ..................................................................... 15


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ABSTRACT

Technology advancements have made possible the

implementation of embedded systems within home appliances.

This has added new capabilities and features, however, most of

the time, the implementations are proprietary and networking is

not always possible. Yet there is an increasing demand for smart

homes, where appliances react automatically to changing

environmental conditions and can be easily controlled through

one common device. This paper presents a possible solution

whereby the user controls devices by employing a central FieldProgrammable Gate Array (FPGA) controller to which the devices

and sensors are interfaced. Control is communicated to the FPGA

from a mobile phone through its Bluetooth interface. This results

in a simple, cost effective, and flexible system, making it a good

candidate for future smart home solutions.


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BLOCK DIAGRAM

Home Section

Mobile Section

Android

Mobile Device

Bluetooth

Interface

RS232

UART

Spartan3an

FPGA5v Relay Stepper Motor

Door Lock

open/close

Fan

light

AC

Heater


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Introduction

The Bluetooth wireless technology is set to revolutionize theway people perceive digital devices in our homes and office

environment. Now they are no longer just the individual devices;

instead, with the embedded Bluetooth technology, they form a

network in which appliances can communicate with each other.

This wireless technology is especially useful in home environment,

where there exists hardly any infrastructure to interconnect

intelligent appliances. It could be suitably used for home

automation in a cost-effective manner. Operating over

unlicensed, universally available frequency of 2.4 GHz, it can link

digital devices within a range of 10 m (expandable to 100 m, by

increasing the transmitted power) at the speed of 1 Mbps.Building upon this theme; we propose a home automation system

based on Bluetooth technology. There are certain issues involved

in the design of a home automation system. The system should be

scalable, so that new device can easily be integrated into it. It should

provide a user-friendly interface on the host side, so that the devices can

be setup, monitored and controlled. The interface should also provide

some diagnostic services so those problems with the system, if any, can


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be tracked down. The overall system should be fast enough to

realize the true power of wireless technology. It should also be

cost effective in order to justify its application in home

automation.The system developed consists of android mobile phone and

a FPGA based Door Lock open/close system and relay on/off to

control electrical Appliance, that is able to communicate with the

host through the Bluetooth link.

Host and client modules in Bluetooth piconet


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Bluetooth home automation mobile software

The Bluetooth home automation mobile software moduleprovides two main services to the users, namely:

1. Device Registration

2. Device Control

Hardware design and development

A Door Lock open/close system and relay on/off to control

electrical Appliance circuitry has been developed to demonstrate

the feasibility and effectiveness of the application. The hardware

interface component of the Bluetooth based home automation

system consists of a FPGA with stepper motor, relay interface and

an RS232 link between the FPGA and the Bluetooth.


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Tool required:

Software: Xilinx ISE 10.1i or above

Language: VHDL

Hardware: 1.Spartan3an FPGA kit

2.Bluetooth Module

3.JTAG Cable

4.Serial Cable

5.Stepper Motor

6.Relay

Source Code

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;


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entity uart_stepper is

port ( clk : in std_logic;

din : in std_logic;

relay : out std_logic:='0';

count : out STD_LOGIC_vector(3 downto 0)

);

end uart_stepper;

architecture Behavioral of uart_stepper is

type state is (ready,b0);

signal ps : state := ready;

signal start,stop : std_logic;

signal store : std_logic_vector(7 downto 0) := "10101010

type state1 is (a0,a1);

signal ps1,ps2 : state1 := a0;

signal s_count:std_logic_vector(3 downto 0);

begin

process(clk)

variable i : integer := 0 ;


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begin

if clk'event and clk = '1' then

if ps = ready then

start


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end if;

if i = 23400 then

store(3)


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end if;

end process;

process(clk,store)

variable j,k,l,m:integer:=0;

begin

if clk'event and clk = '1' then

if store = x"33" then

if(ps1=a0)thenj:=j+1;

if(j=500000)then

s_count


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if(j=2000000)then

s_count


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if(l=1500000)then

s_count


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ps1


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Home Automation System Using Bluetooth