Remote AC Power Control by Android Application with LCD Display - PowerPoint PPT Presentation

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Remote AC Power Control by Android Application with LCD Display

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This AC power control using thyristor for induction motor runs on the principle of firing angle control of thyristors. It is controlled by android remote. – PowerPoint PPT presentation

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Title: Remote AC Power Control by Android Application with LCD Display


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Remote AC Power Control by Android Application
with LCD Display
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Remote AC Power Control by Android Application
with LCD Display
Introduction
  • The project is designed to control AC power to a
    load by using firing angle control of thyristor.
    Efficiency of such power control is very high
    compared to any other method. 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.

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Remote AC Power Control by Android Application
with LCD Display
Block Diagram
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Remote AC Power Control by Android Application
with LCD Display
Hardware Requirements
  • 8051 series Microcontroller
  • LM358
  • Opto isolators
  • SCRs
  • Push Button
  • Transformer
  • Diodes
  • Voltage Regulator
  • Resistors
  • Capacitors
  • Crystal
  • Lamp
  • Bluetooth Device

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Remote AC Power Control by Android Application
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Software Requirements
  • Keil compiler Languages
  • Embedded C or Assembly
  • Android Application.

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Remote AC Power Control by Android Application
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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.

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Remote AC Power Control by Android Application
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Embedded Systems
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Remote AC Power Control by Android Application
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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

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Remote AC Power Control by Android Application
with LCD Display
Micro Controller
  • 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

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Remote AC Power Control by Android Application
with LCD Display
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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Remote AC Power Control by Android Application
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AT89S52
  • AT89S52 is a low-power, high-performance CMOS
    8-bit microcontroller with 8K bytes of in-system
    programmable Flash memory.
  • The device is manufactured using Atmels
    high-density nonvolatile memory technology.
  • It is compatible with the industry-standard 80C51
    instruction set and pinout.
  • The on-chip Flash allows the program memory to be
    reprogrammed in-system or by a conventional
    nonvolatile memory programmer.

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Remote AC Power Control by Android Application
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PIN Diagram Of AT89S52
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Remote AC Power Control by Android Application
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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.

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Remote AC Power Control by Android Application
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Pin Description of MOC3021
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Remote AC Power Control by Android Application
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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

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Remote AC Power Control by Android Application
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LM 358 (OPAMP)
  • 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.

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Remote AC Power Control by Android Application
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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
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Remote AC Power Control by Android Application
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Thyristor
  • A thyristor is a solid-state semiconductor device
    with four layers of alternating N and P-type
    material.
  • It acts exclusively as a bistable switch,
    conducting when the gate receives a current
    trigger.
  • Continuing to conduct while the voltage across
  • the device is not reversed
    (forward-biased).

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Remote AC Power Control by Android Application
with LCD Display
Thyristor
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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Remote AC Power Control by Android Application
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SCR
  • A silicon-controlled rectifier (or
    semiconductor-controlled rectifier) is a
    four-layer solid state device that controls
    current.
  • The name "silicon controlled rectifier" or SCR
    is General Electric's trade name for a type of
    thyristor.
  • An SCR consists of four layers of alternating P
    and N type semiconductor materials.
  • Silicon is used as the intrinsic semiconductor,
    to which the proper dopants are added.

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Remote AC Power Control by Android Application
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SCR
  • The doping of PNPN will depend on the application
    of SCR, since its characteristics are similar to
    those of the thyratron.

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Remote AC Power Control by Android Application
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What is 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 phones core functionality such as making
    calls, sending text messages, or using the camera.

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Remote AC Power Control by Android Application
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Android
  • 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.

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Remote AC Power Control by Android Application
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LED Android
  • Android is open source and Google releases the
    code under the Apache License.
  • This open-source code and permissive licensing
    allows the software to be freely modified and
    distributed by device manufacturers, wireless
    carriers and enthusiast developers.
  • Additionally, Android has a large community of
    developers writing applications ("apps") that
    extend the functionality of devices, written
    primarily in a customized version of the Java
    programming language.

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Remote AC Power Control by Android Application
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AC Controller
  • MOC3051 can control the signal voltage
    transmitting from the mocirocontroller to the
    TRIAC which isolates the AC and DC supply.

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Remote AC Power Control by Android Application
with LCD Display
Working Principle
  • To control AC power to a load by using firing
    angle control of thyristor.
  • Efficiency of such power control is very high
    compared to any other method.
  • Remote operation is achieved by any smart
    Interface) based touch screen operation.
  • Comparator whose output is then fed to the
    microcontroller.
  • The triggering control to a pair of SCRs through
    opto isolator interface.

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Remote AC Power Control by Android Application
with LCD Display
Working Principle
  • Finally the power is applied to the load through
    the SCRs in series.
  • This project uses a microcontroller from 8051
    family which is interfaced through a Bluetooth
    device
  • It receives signal from Android application de
    load.
  • A lamp is used in place of an induction motor
    whose varying intensity demonstrates the varying
    power to the motor.

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Remote AC Power Control by Android Application
with LCD Display
Working Principle
  • The varying power results in variation in speed
    of the motor.
  • The project can be further enhanced by using
    direct 230 volt supply instead of 12 volt AC to
    the bridge rectifier for achieving higher voltage
    control for charging number of batteries in
    series.

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Remote AC Power Control by Android Application
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Applications
  • Low energy consumption.
  • High thermal insulation.
  • Superior performance.
  • Long functional life.

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Remote AC Power Control by Android Application
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Conclusion
  • We have been discussing about project uses a
    microcontroller from 8051 family which is
    interfaced through a Bluetooth device, which
    receives signal from Android application device
    for increasing or decreasing the AC power to the
    load with LCD display. A lamp is used in place of
    an induction motor whose varying intensity
    demonstrates the varying power to the motor. 

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