Home automation under wi fi through android apps from any smart phone

Home automation under Wi-Fi through

Android apps from any smart phone

http://www.edgefxkits.com/

Home automation under Wi-Fi through Android apps from any smart

phone

Introduction

The main aim of the project is to control multiple electrical loads remotely over internet falling under the basic principles of Internet of Things-IOT. For this real-time scenario we use an Android app on any smart cell phone with user configurable front end (GUI). The data sent from the cell phone upon touch commands are sent through allotted IP fed to it, to any nearby wireless modem which is then received by a Wi-Fi module interfaced to a microcontroller of 8051 series, under TCP IP via networked wireless modem environment.

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Block Diagram


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Hardware Requirements Microcontroller

LCD display A to D converter Temperature sensors Relay Resistors Capacitors Diodes Transformer Voltage Regulator Transistors relays WiFi module as required


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Software Requirements

Keil compiler

Language: Embedded C or Assembly.


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Wi-Fi through android apps

The Wi-Fi works on radio waves technology.

The data to be passed through Wi-Fi is converted into the electromagnetic signal which is then sent using the antenna.

This signal is received and decoded by the outer at the receiving end.

This signal is passed to the controller which is nothing but AVR controller.


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Home automation Home automation is the residential extension of building automation and

involves the control and automation of lighting, heating, ventilation, air conditioning (HVAC), appliances, and security.

Modern systems generally consist of switches and sensors connected to a central hub sometimes called a "gateway"

From which the system is controlled with a user interface that is interacted either with a wall-mounted terminal, mobile phone software, tablet computer or a web interface.


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Micro Controller Compatible with MCS®-51 products

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 AT89S52


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Home automation Home automation is the residential extension of building automation.

And involves the control and automation of lighting, heating, ventilation, air conditioning (HVAC), appliances, and security.

Modern systems generally consist of switches and sensors connected to a central hub sometimes called a "gateway"

From which the system is controlled with a user interface that is interacted either with a wall-mounted terminal, mobile phone software, tablet computer or a web interface.


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Liquid Crystal Display (LCD) Most common LCDs connected to the microcontrollers are 16x2 and 20x2

displays.

This means 16 characters per line by 2 lines and 20 characters per line by 2 lines, respectively.

The standard is referred to as HD44780U

It refers to the controller chip which receives data from an external source (and communicates directly with the LCD.


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A to D Converter

Analog signals – directly measurable quantities in terms of some other quantity

Examples:

Thermometer – mercury height rises as temperature rises

Car Speedometer – Needle moves farther right as you accelerate

Stereo – Volume increases as you turn the knob.


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Analog Signal






A to D Converter

Digital Signals – have only two states. For digital computers, we refer to binary states, 0 and 1. “1” can be on, “0” can be off.

Examples:

Light switch can be either on or off

Door to a room is either open or closed


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Digital Signal






A to D Converter


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Converts analog signals into binary words






A to D Converter


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Quantizing - breaking down analog value is a set of finite states

Example:

You have 0-10V signals. Separate them into a set of discrete states with 1.25V increments. (How did we get 1.25V? See next slide…)

Output States

Discrete Voltage Ranges (V)

0 0.00-1.25

1 1.25-2.50

2 2.50-3.75

3 3.75-5.00

4 5.00-6.25

5 6.25-7.50

6 7.50-8.75

7 8.75-10.0






A to D Converter


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Encoding - assigning a digital word or number to each state and matching it to the input signal

Example:

Here we assign the digital value (binary number) to each state for the computer to read.

Output States

Output Binary Equivalent

0 000

1 001

2 010

3 011

4 100

5 101

6 110

7 111






Relay It is A electro magnetic switch

Used to control the electrical devices

Copper core magnetic flux plays main role here


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Relay Driver ULN2003 ULN is relay driver application

The ULN2003 is A monolithic high voltage and high current darlington

transistor arrays.

It consists of seven NPN darlington pairs that features high-voltage

outputs with common-cathode clamp diode for switching inductive

loads.

The collector-current rating of a single darlington pair is 500ma.

The darlington pairs may be paralleled for higher current capability.


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Relay Driver ULN2003

The ULN functions as an inverter.

If the logic at input 1b is high then

the output at its corresponding pin 1c

will be low.


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Working Principle The data sent from the cell phone upon touch commands are sent

through allotted IP fed to it, to any nearby wireless modem.

Which is then received by a Wi-Fi module interfaced to a microcontroller of 8051 series, under TCP IP via networked wireless modem environment.

Relays are then driven as per the command received at the controller end to handle electrical loads.


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http://www.edgefxkits.com/8051-microcontroller-projects






Working Principle The real time data is also seen at the sending end upon a LCD display

interfaced to the microcontroller that displays the status of the loads too.

The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC.

This is converted to DC using a Bridge rectifier and

It is then regulated to +5V using a voltage regulator 7805

Which is required for the operation of the microcontroller , 3.3 volt for the Wi-Fi unit and other components.


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Applications


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Home automation – This project can be used to control various Home Appliances

We can control device from a long distance, thus it gives ease of access.

Faster operation and efficient.

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






Conclusion


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Home automation under Wi-Fi through Android apps from any smart phone was designed and implemented to control multiple electrical loads remotely over internet falling under the basic principles of Internet of Things-IOT. For this real-time scenario we use an Android app on any smart cell phone with user configurable front end (GUI).

http://www.edgefxkits.com/iot-internet-of-things-based-remotely-managed-home-automation-under-wi-fi-through-android-apps-from-any-smart-phone

http://www.edgefxkits.com/iot-internet-of-things-based-remotely-managed-home-automation-under-wi-fi-through-android-apps-from-any-smart-phone










Engineering

Home automation under wi fi through android apps from any smart phone