Home Automation by Android Application based Remote Control

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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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Home Automation System

• 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.

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Block Diagram

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Power supply
Bridge rectifier
230 V AC 50 Hz
5v Regulator

5V DC
Filter(470µf)
12V step down transformer
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Micro controller

• 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
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Block diagram of MC

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MC components explanation

• ROM
• 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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Android Remote Control

• 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.

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Android Remote Control

• 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.

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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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Circuit Operation

• 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.

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Circuit Operation

• 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.

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Applications and Advantages

• 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 worlds 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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