10-04-2017, 09:12 PM
We have been posting several latest and advanced PIC microcontroller based projects and here is another wonderful wireless home automation project for Engineering/ Diploma students, Android Bluetooth Home Appliances Control System. Android phones are very popular today due to their limitless possibilities, have you thought about controlling your home appliance from your android phone via Bluetooth?
This electronics engineering project is capable of controlling home appliances using your android device over Bluetooth. Only you have to install an android application in your android phone or tablet, then you can switch ON or OFF any electrical appliances by simply touching the screen of your android phone.
Though there are many home automation apps available in PlayStore we re gonna use Arduino Bluetooth Control. This App supports a maximum of eight devices to control, even it can be a high power water pump motor. I have been using this system in my office to control appliances like PC, A/C*, Room Light, Plug etc. So be ready guys let s build app controlled appliances.
Components Required for Bluetooth Home Appliances Control System
Arduino Bluetooth Control App
PIC16F628A
Bluetooth Module HC-06 or HC-05
Relay (12V x6)
Crystal (20MHz)
Capacitor (33pf x2; 10 F)
Resistor (10K)
IC ULN2003A
Push Button
Working of Android Home Automation Project
This smart home system using android application is built around PIC16F628A microcontroller to make the system smaller to accommodate inside a switch board case.
To connect android device with our embedded smart home automation system we use a HC-05 or HC-06 Bluetooth module.
In the app, you can see eight device buttons. Names of these buttons can be edited as per your requirement like FAN, LIGHT, A/C*, MOTOR*, HEATER*, etc. and configure the App (see section configure Bluetooth App)
After launching the application you can connect your android tab or mobile device with the Bluetooth module using the default pass key 1234 .
As the connection is established you can press the buttons, so it will send letters via Bluetooth, it will be available in the TX pin of Bluetooth module which is connected to RX pin of microcontroller.
(* For high current equipment use high current handling relays)
Program Execution for Android Home Automation
In our home automated system circuitry PIC will continuously check if any serial data is received, which will be stored on a variable A . Then a switch function is used to control the output pins at PORT B.
I have used PORTB to connect devices via relay driver IC ULN2003A. Switching of devices is done by relays, which driven by IC ULN2003A,
Two pins of PORTB (RB1 and RB2) are used for serial communication and remaining pins are used to connect devices.
So totally we used only six pins to control devices, since the app has eight device options you can use PORTA upon requirement.
For the first device, by pressing button the App will send capital letter A to the Bluetooth module. It will make PORTB 0th Pin (RB0=1) to HIGH hence turning ON the corresponding relay.
If you press the button again App will send small letter a to the Bluetooth module. It will make PORTB 0th Pin (RB0=0) to LOW hence turning OFF the corresponding relay.
For the remaining buttons also it will send B, C, D, E, F, G and b, c, d, e, f, g
Another advantage of this project is that the App has provision to switch ON devices for a preset time. With this facility you can fully automate the system.
There is a button to switch ON timer for each device switches, time can be set from one minute to 4 hour.
Application will automatically send OFF command to the system by making an alert.
Appliances are connected to relays, which handle high current devices, the load that can be handle by the relay is depend on relay used. If you use 30A relay you can switch 30A devises.