Home Automation by Android Application based Remote

Control

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Introduction

The primary objective of this project is to develop a home automation system with Android application controlled remote.

Remote Controlled Home Automation System provides a simpler solution with Android application technology.

Remote operation is achieved by any smart-phone or Tablet with Android OS, upon a GUI (Graphical User Interface) based touch screen operation.

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Home Automation System Home Automation is the controlling and operating of the home

appliances such as lighting equipment, kitchen appliances, air conditioning and heating, audio/video systems, etc. in either automatic or manual modes conveniently and efficiently.

This system uses various types of sensors to sense or detect the parameter status and with the use of centralized controllers it appropriately activates the loads for prescribed limits or conditions.

In addition controlling it also provides energy saving, graphical user interface or HMI and security to the homes.

Home control systems where different sensors corresponding to the home appliances with the appropriate actuators are hard-wired to input/output modules of a central controller.

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The sensors sense the motion, light, temperature, smoke and other sensing variables using sensing devices like photo detectors, IR sensors, thermocouples, current and voltage transformers and many more.

Upon receiving these variables and based on the program, the main or central controller activates the loads using actuators like motors, switches, relays, and other actuating devices.

These controllers can be a compact controller to high-end modular programmable logic controllers with I/O enlarges capability.

For the user interface, this automation is integrated with different interfacing modules computer/laptops, smart phones, touch pads, a tablet with a user-friendly HMI application.

Home Automation System

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Block Diagram

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230 V AC 50 Hz

Bridge rectifier

Filter(470µf)

5v Regulator

5V DC

12V step down transformer

Power supply

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8K Bytes of In-System Programmable (ISP) Flash

Memory.

4.0V to 5.5V Operating Range.

Crystal Frequency 11.0592MHZ.

Three-level Program Memory Lock.

256 x 8-bit Internal RAM.

32 Programmable I/O Lines.

Three 16-bit Timer/Counters.

AT89S52

Micro controller

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CPU

On-chip RAM

On-chip ROM for program code

4 I/O Ports

Timer 0

Serial PortOSC

Interrupt Control

External interrupts

Timer 1

Timer/Counter

Bus Control

TxD RxDP0 P1 P2 P3

Address/Data

Counter Inputs

Block diagram of MC

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MC components explanationROM:

A code of 4K memory is incorporated as on-chip ROM in 8051.

RAM:

The 8051 microcontroller is composed of 128 bytes of internal RAM.

Interrupt Control:

An event which is used to suspend or halt the normal program execution for a temporary period of time in order to serve the request of another program or hardware device is called an interrupt.

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MC components explanation

Address Bus:

A bus is group of wires using which data transfer takes place from one location to another within a system.

Timers and Counters:

Synchronization among internal operations can be achieved with the help of clock circuits which are responsible for generating clock pulses.

Internal operations can be synchronized using clock circuits which produce clock pulses.

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Pin diagram of 8052

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8052 pin diagram explanation

Port 0(p0.0 to p0.7):

It is 8-bit bi-directional I/O port. It is bit/ byte addressable. During external memory access, it functions as multiplexed data and low-order address bus AD0-AD7.

Port 1 (p1.0 to p1.7):

It is 8-bit bi-directional I/O port. When logic '1' is written into port latch then it works as input mode. It functions as simply I/O port and it does not have any alternative function.

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8052 pin diagram explanation

Port 2 (p2.0 to p2.7):

It is 8-bit bi-directional I/O port. It is bit/ byte addressable.

Port 3(p3.0 to port 3.7):

It is 8-bit I/O port. In an alternating function each pins can be used as a special function I/O pin.

RESET:

It is active high I/P signal. It should be maintained high for at least two machine cycle while oscillator is running then 8051 microcontroller resets.

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Android Remote Control As we know that Android is a popular smartphone technology,

which has been developing ample mobile applications.

So, to turn a smartphone or tablet as a universal remote control in place of conventional remotes is a good idea as this is the most efficient and flexible automation.

This technology makes every appliance at home as a potential accessory for smartphones.

Android remote control based home automation consists of Android OS operated Graphical User Interface (GUI) with wireless communication modules such as Bluetooth and Zigbee to have control of different home appliances.

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In this system, different sensors and load controllers in the home are connected to sensors and an I/O control module has the capability to communicate with a user-controlled device.

At the user controlling side, the smartphone or tablet with an android-application-based GUI-controller allows the user to send the desired control signals such as switching a lamp OFF and ON, room temperature maintenance, etc.

Building of this Android-based home automation is a simple concept as you can implement this in your home by using cost-effective products like microcontroller and sensors as Do It Yourself (DIY) project.

Android Remote Control

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So let us understand this in brief using Bluetooth communication to control home appliances.

The block diagram below shows the design of Android-based home-appliance control that is implemented by using 8051 microcontrollers.

Android Remote Control

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Graphical Diagram

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Circuit Operation

The smartphone or android mobile is paired to the Bluetooth attached to the microcontroller.

Once both are paired, the controlling signals correspond to the load to operate, it can be sent from an Android remote control or phone.

From the touch panel of a GUI interface-based application, if any key or button is pressed, the application sends the corresponding signals to the remote Bluetooth modem.

Then, at the receiver side, the Bluetooth modem receives these signals and processes them according to the code, and finally sends the control signals to the relay driver IC.

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This driver IC energizes the respective coils to switch the appropriate loads.

This system is useful for the elderly and physically handicapped people as they face difficulties while operating the loads.

So, with this Android-home-control system, they can easily serve the loads with portable Android mobile phones.

It is also possible to add a temperature sensor by adding an ADC to the microcontroller to switch on the air-conditioning system depending on temperature variations.

Circuit Operation

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Thus, we hope that the furnished information on wireless home automation using Android mobile might have provided the concept to you in detail.

And, also you can just imagine how simple would it be to implement such a system in your home that too at a very reasonable cost by using cost-effective devices.

If you want complete circuit or any technical help regarding practical guidance to implement electronic projects or this concept you can reach us by commenting below.

Circuit Operation

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Applications and Advantages

1. Home Automation – This project can be used to control various Home Appliances.

2. We can control device from a long distance. Thus, it provides ease of access.

3. Faster operation and efficient.

4. No need to carry separate remote or any other controlling unit.

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Future Development

We can interface sensors to this project so that it can monitor certain parameters.

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Conclusion

Today, Android is the world’s powerful mobile platform that customizes hacked, manipulated and molded open source operating system to fit easily whatever the functionality you had in your mind.

This detailed information about wireless home automation using Android mobile helps you to implement such a fantastic system in your home at a very reasonable price using cost-effective devices.

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