REMOTE AC POWER CONTROL BY ANDROID APPLICATION WITH LCD DISPLAY SUBMITTED BY

ABSTRACT principle of firing angle delay of thyristors using back to back SCR’s with control being fed from a microcontroller via opto isolators The firing angle would be adjusted to maintain the load power by an up and down switch

………….contd Remote operation is achieved by any smart-phone/Tablet etc., with Android OS, upon a GUI (Graphical User Interface) based touch screen operation. The project uses zero crossing point of the waveform which is detected by a comparator whose output is then fed to the microcontroller.

BLOCK DIAGRAM

HARDWARE COMPONENTS 8051 series Microcontroller. LM358. Opto isolators, SCRs, Push Button. Transformer, Diodes, Voltage Regulator. Resistors, Capacitors, Crystal, Lamp. Bluetooth Device.

EMBEDDED SYSTEMS Definition for :- EMBEDDED SYSTEMS A combination of hardware and software which together form a component of a larger machine. An example of an embedded system is a microprocessor that controls an automobile engine. An embedded system is designed to run on its own without human intervention, and may be required to respond to events in real time.

EMBEDDED SYSTEMS

AT89S52 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 Three 16-bit Timer/Counters Eight Interrupt Sources Full Duplex UART Serial Channel Watchdog Timer AT89S52

PIN DIAGRAM OF AT89S52

MOC3021 ( OPTO COUPLER ) Opto-couplers are made up of a LED and a light sensitive device, all wrapped up in one package no electrical connection between the two devices The light sensitive device may be a photodiode, phototransistor, or more esoteric devices such as thyristors, triacs etc.  

LM 358 (OPAMP) Internally frequency compensated for unity gain. Large dc voltage gain: 100 Db. Wide bandwidth (unity gain): 1 MHz (temperature compensated) Wide power supply range: Single supply: 3V to 32V or dual supplies: ±1.5V to ±16V Very low supply current drain (500 µA)-essentially independent of supply voltage. Low input offset voltage: 2 mV Input common-mode voltage range includes ground. Differential input voltage range equal to the power supply voltage.

LM 358 PIN DIAGRAM 1 - Output 1 2 - Inverting input 3 - Non-inverting input 4 – VCC- 5 - Non-inverting input 2 6 - Inverting input 2 7 - Output 2 8 – VCC+

THYRISTOR PIN 1 -- INPUT (ANODE) PIN 2– GATE PIN 3-- OUTPUT (KATHODE) MODES OF OPERATION: In the normal "off" state, the device restricts current to the leakage current When the gate-to-cathode voltage exceeds a certain threshold the device turns "on" and conducts current.

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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 have tp 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 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.

Android App Blue-control Screen

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.

SOFTWARE REQUIREMENTS PROGRAMMING LANGUAGES Embedded C , ALP (Assembly Language) COMPILERS: Keil 2.0/3.0uv DUMPING SOFT WARE: Using Micro controller flash Software we are dumping our HEX Code into Micro Controller

KEIL COMPILER WINDOW

BIBILOGRAPHY The 8051 Microcontroller and Embedded systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi , Pearson Education. ATMEL 89S52 Data Sheets. www.atmel.com www.beyondlogic.org www.wikipedia.org www.howstuffworks.com www.alldatasheets.com

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