Remote ac power control by android application with lcd display

Remote AC Power Control by Android

Application with LCD Display

http://www.edgefxkits.com/

Remote AC Power Control by Android Application with LCD

DisplayIntroduction

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.

https://www.facebook.com/edgefx

https://twitter.com/edgefxtech

https://plus.google.com/+Edgefxkits/

https://www.youtube.com/user/efxkits



DisplayBlock Diagram







DisplayHardware Requirements 8051 series Microcontroller

LM358 Opto isolators SCRs Push Button Transformer Diodes Voltage Regulator Resistors Capacitors Crystal Lamp Bluetooth Device







DisplaySoftware Requirements

Keil compiler Languages:

Embedded C or Assembly

Android Application.







DisplayEmbedded 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.







DisplayEmbedded Systems







DisplayMicro 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







DisplayMicro 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







DisplayLiquid 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.







DisplayAT89S52

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 Atmel’s 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.







DisplayPIN Diagram Of AT89S52







DisplayMOC3021 ( 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.







DisplayPin Description of MOC3021







DisplayLM 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







DisplayLM 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.







DisplayLM 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+







DisplayThyristor

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).







DisplayThyristor

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.

Modes of Operation:







DisplaySCR

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.







DisplaySCR The doping of PNPN will depend on the application of SCR, since its

characteristics are similar to those of the thyratron.







Display

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 phone’s core functionality such as making calls, sending text messages, or using the camera.







Display

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.







DisplayLED 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.







DisplayAC Controller

MOC3051 can control the signal voltage transmitting from the mocirocontroller to the TRIAC which isolates the AC and DC supply.







DisplayWorking 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.







DisplayWorking 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.







DisplayWorking 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.

http://www.edgefxkits.com/pair-of-scr-bridge-based-high-power-dual-converter







Display

Applications Low energy consumption.

High thermal insulation.

Superior performance.

Long functional life.







Display

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.

http://www.edgefxkits.com/remote-ac-power-control-by-android-application-with-lcd-display

http://www.edgefxkits.com/remote-ac-power-control-by-android-application-with-lcd-display










Engineering

Remote ac power control by android application with lcd display