REMOTE PASSWORD OPERATED LOAD CONTROL BY ANDROID APPLICATIONS Project Title REMOTE PASSWORD OPERATED LOAD CONTROL BY ANDROID APPLICATIONS Under the Guidance of Submitted by

ABSTARCT The main objective of this project is to provide a security system having the provision to change the password by the authority only. Remote operation is achieved by any smart-phone/Tablet etc., with Android OS, upon a GUI (Graphical User Interface) based touch screen operation. Android application is used to enter the password and a relay to lock or unlock the electric door, which is indicated by a lamp.

PROJECT BLOCK DIAGRAM

HARDWARE COMPONENTS 8051 series Microcontroller. ,Relay Driver IC, EEPROM. Bluetooth device. Resistors, Capacitors, LED, Diodes. Relays Transformer, Voltage Regulator. Crystal, Lamps.

POWER SUPPLY Bridge rectifier 5v Regulator 230 V AC 50 Hz 5V DC Filter(470µf) 12V step down transformer

It is a smaller computer Has on-chip RAM, ROM, I/O ports... MICROCONTROLLER It is a smaller computer Has on-chip RAM, ROM, I/O ports... RAM ROM I/O Port Timer Serial COM Port Microcontroller CPU A single chip

INTERNAL STRUCTURE OF A MICRO CONTROLLER-AT89S52/51 CPU On-chip RAM On-chip ROM for program code 4 I/O Ports Timer 0 Serial Port OSC Interrupt Control External interrupts Timer 1 Timer/Counter Bus Control TxD RxD P0 P1 P2 P3 Address/Data Counter Inputs

Features of AT89S51/52 Compatible with MCS®-51 Products 8K Bytes of In-System Programmable (ISP) Flash Memory Endurance: 10,000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Full Duplex UART Serial Channel Interrupt Recovery from Power-down Mode Watchdog Timer Dual Data Pointer

Pin Description

What is called Android..? Android is an open-source operating system which means that any manufacturer can use it in their phones free of charge. It was built to be truly open. For example, an application can call upon any of the phone’s core functionality such as making calls, sending text messages, or using the camera. 

…….contd Android is built on the open Linux Kernel. Furthermore, it utilizes a custom virtual machine that was designed to optimize memory and hardware resources in a mobile environment.

What is an android application on mobile phones? An android app is meant for phones with an android based operating systems. They can be downloaded from the android app Market which is pre-loaded on every android phone. Blue control APP and Bluetooth Spp APP are some examples.

Android-The world's most powerful mobile platform Very customizable. Open source operating system is easily changed, hacked, manipulated, and molded to fit whatever functionality you had in mind. Found on all platforms for all prices depending on what hardware and software version you are interested in. The battery is usually replaceable.

COMPARISION OF ANDROID WITH OTHER OS ANDROID OS : Android is open source software, manufacturers can modify the operating system to suit their respective needs and phones. This becomes a cheap and feasible alternative for the manufacturer, as opposed to developing an operating system in-house or hiring a software company to do it.

i-OS: It's not available on all carriers but this is expanding. The battery is not replaceable which is why all the I Phone users you know have it plugged in all the time as the battery degrades.

Windows Phone: Windows Phone is a closed-sourced, which means that it is solely developed by the company and protected by copyright. The Windows Store is limited as there only a few number of apps

ANDROID APP-Bluetooth SPP Bluetooth SPP Manager is an app, which provides communication between two Bluetooth devices. it uses the RFCOMM Protocol also known as Serial Port Protocol (SPP) to transmit data between devices.

Device pairing- APP Asking for a secured Pin use “1234” pin

HIGHLIGHTS OF SPP APP Communication between Bluetooth devices via SPP. Using This App, communication between a phone and external processor/controller can be achieved. Serial communication is an asset of this app. Text,chat,digits..etc can be transmitted to any external Devices.

APP ASKING FOR OPERATION MODES ALWAYS USE FOR REAL TIME MODE OPTION

Easily available Resource CAN BE FREELY DOWNLOADABLE FROM GOOGLE PLAY FROM ANY ANDROID PHONE AND CAN EASILY INSTALL IT . From Any Android Phone an Internet Access/wi-fi..or any other resource is Necessary to Down load the APP.

ANDROID APPLICATION OPERATED BLUETOOTH The Android platform includes support for the Bluetooth network stack, which allows a device to wirelessly exchange data with other Bluetooth devices. The application framework provides access to the Bluetooth functionality through the Android Bluetooth APIs.

FEATURES OF BLUETOOTH   Super simple and easy way to interface using Bluetooth stack. 3.3V Device with standard 5V DC Power source. Can also support SPI Protocol, pins are made available. Low power consumption, Low cost. Has high-performance wireless transceiver system Can be used to interface with PC, Mac or Android phones/tablets.

Generic Default Visibility at Software side:HC-06 or Linvor Default Pairing code is not '0000' but '1234'. Please use Baud Rate with 8-N-1 connectivity from other device. Works with any microcontroller with Serial connectivity.

EEPROM EEPROM is Electrically Erasable Programmable Read-Only Memory that can be electrically erased and reprogrammed.. AT24C02 is a two wire 2Kbits serial EEPROM by Atmel. The memory is organized in 256 words of single byte each arranged in 32 pages of 8 bytes each.

Contd.. AT24C02 is two-wire serially programmable i.e., for programming, the data and control signals are provided serially along with clock signals from the other wire. The read-write operations are accomplished by sending a set of control signals including the address and/or data bits. This facilitates interfacing of a maximum of eight (23) 24C02 devices to a system thereby, incorporating a maximum 16Kbits memory.

RELAY IT IS A ELECTRO MAGNETIC SWITCH USED TO CONTROL THE ELECTRICAL DEVICES COPPER CORE MAGNETIC FLUX PLAYS MAIN ROLE HERE

The relay's switch connections are usually labeled COM, NC and NO: COM = Common, always connect to this; it is the moving part of the itch. NC = Normally Closed, COM is connected to this when the relay coil is off. NO = Normally Open, COM is connected to this when the relay coil is on

RELAY DRIVER (ULN 2003) ULN2003 is a high voltage and high current Darlington transistor array It consists of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode Clamp diode for switching inductive loads. The ULN2003 has a 2.7kW series base resistor for each Darlington pair for operation directly with TTL or 5V CMOS devices. Current, Output Max:500mA Voltage, Input Max:5V Voltage, Output Max:50V

Fig: ULN 2003

BC547 The BC547 transistor is an NPN Epitaxial Silicon Transistor. The BC547 transistor is a general-purpose transistor in small plastic packages. It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA NPN general-purpose transistors. Whenever base is high, then current starts flowing through base and emitter and after that only current will pass from collector to emitter  

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

If an 8-bit data bus is used the LCD will require 11 data lines LCD BACKGROUND If an 8-bit data bus is used the LCD will require 11 data lines (3 control lines plus the 8 lines for the data bus) The three control lines are referred to as EN, RS, and RW EN=Enable (used to tell the LCD that you are sending it data) RS=Register Select (When RS is low (0), data is treated as a command) (When RS is High(1), data being sent is text data ) R/W=Read/Write (When RW is low (0), the data written to the LCD) (When RW is low (0), the data reading to the LCD)

Working of Project The project uses one EEPROM to store the desired number entered by the keypad, which is interfaced to Microcontroller. While the user wants to open the lock which is prompted by an LCD display duly connected to the Microcontroller o/p. The entered number by the keypad is matched with the stored number and it found on the Microcontroller o/p delivers a logic high to either open or close the door by operating two Relays interfaced from the Microcontroller via ULN20003 For the purpose of the project o/p verification two lamps are used to indicate one for door opening & other for door closing.

Soft ware Requirements Keil an ARM Company makes C compilers, macro assemblers, real-time kernels, debuggers, simulators, integrated environments, evaluation boards, and emulators for ARM7/ARM9/Cortex-M3, XC16x/C16x/ST10, 251, and 8051 MCU families. Compilers are programs used to convert a High Level Language to object code. Desktop compilers produce an output object code for the underlying microprocessor, but not for other microprocessors.

i.e the programs written in one of the HLL like ‘C’ will compile the code to run on the system for a particular processor like x86 (underlying microprocessor in the computer). For example compilers for Dos platform is different from the Compilers for Unix platform  So if one wants to define a compiler then compiler is a program that translates source code into object code.

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