Remote AC Power Control by Android Application with LCD Display

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Presentation Description

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.

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Presentation Transcript

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Remote AC Power Control by Android Application with LCD Display

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http://www.edgefxkits.com / 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display Block Diagram

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http://www.edgefxkits.com / 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display Software Requirements Keil compiler Languages: Embedded C or Assembly Android Application.

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display Embedded Systems

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / 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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http://www.edgefxkits.com / 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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 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.

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display PIN Diagram Of AT89S52

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display Pin Description of MOC3021

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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 w hile the voltage across the device is not reversed (forward-biased).

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display Thyristor 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:

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD 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.

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD 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.

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display 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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http://www.edgefxkits.com / 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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http://www.edgefxkits.com / 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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http://www.edgefxkits.com / 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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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD Display Applications Low energy consumption. High thermal insulation. Superior performance. Long functional life.

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http://www.edgefxkits.com / Remote AC Power Control by Android Application with LCD 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. 

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