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8/7/2019 tpdmodified

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T UCHPAD DESIGN

USING LOGIC GATESInternal Guide

Ms.Anitha Chowdary

Presentation by

Kiran

Mohan

Rajesh

Ramesh


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Definitions.Definitions.

` What is touch pad?A device which you touch in different places in order tooperate a program.

` What is Logic Gate?

An electronic switch that reacts

in one of two ways to data that is

put into it. A computer performsoperations by passing data through

a very large number of logic gates


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Outline.Outline.

` Hardware DesignMicro controller AT89S51(Heart of project)

Regulated Power Supply

LM324 Operational Amplifier

Relay

` Working of Touch Pad

` Software

` Advantages

` Disadvantages

` Applications of Touch Pad

` Conclusion


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MICRO CONTROLLER(AT89S51):MICRO CONTROLLER(AT89S51):

` The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of in-systemprogrammable Flash memory.

` The device is manufactured using Atmelshigh-density nonvolatile memory technology.

`

The on-chip Flash allows the program memory to bereprogrammed in-system or by a conventional nonvolatilememory programmer.


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MICRO CONTROLLER(AT89S51):MICRO CONTROLLER(AT89S51):

` AT89S51 operating voltage range is up to 4-5.5V.

` The AT89S51 can be programmed from 1000-10000times.

` AT89S51 maximum operating frequency is 33MHZ, inorder to have a faster computing speed.

` The Atmel AT89S51 provides a highly-flexible and cost-effective solution to many embedded control applications.


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REGULATED POWER SUPPLY:REGULATED POWER SUPPLY:

` A RPS (Regulated Power Supply) is the Power Supplywith Rectification, Filtering and Regulation being done onthe AC mains to get a Regulated power supply forMicrocontroller and for the other devices being

interfaced to it.


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LM324 OPERATIONAL AMPLIFIER:LM324 OPERATIONAL AMPLIFIER:

` LM324 consist of four independent, high-gain operationalamplifiers on a single monolithic substrate.

` An on-chip capacitor in each

of the amplifiers provides frequency

compensation for unity gain.

` The device is designed specially to operate from eithersingle or dual supplies, and the differential voltage range isequal to the power-supply voltage.


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RELAY:RELAY:

` These SPDT relays covers switching capacity of 10A in spite of miniaturesize for PCB Mount.

Main Features:

` 1. RW Series Relay covers switchingcapacity by 10A is spite of miniature

size to comply with users wide selection.

` 2. RWH is approved C-UL & TV safety standard.

` 3. The employment of suitable plastic materials is applied under high

temperature condition and various chemical solutions.

` 4. Complete protective construction is designed form dust and solderingflux. If required, plastic sealed type is available for washing procedure.


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How Does a Touchpad Work?......How Does a Touchpad Work?......

` The input to microcontroller is a 5v which applied tomicrocontroller and other devices from regulator ofpower supply unit.

` When the touchpad switch is touched initially, then

through human resistance the transistor switch gets ON.` CD4011 are Switches used in the

circuit, these are given to the

microcontroller through LM324.

` LM324 quad Operational Amplifier strengthens the inputsignals and passes to microcontroller.


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` The output from LM324 given to microcontroller(in thisproject it is given to port1.1,port1.2 and port1.3).

` The microcontroller performs its operation according to

the program dumped into it.

` The program can be written in either C or ASM languageusing Keil vision software.


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Manufactured Touchpad.Manufactured Touchpad.

` Resistor conductive sheet material


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SOFTWARE.SOFTWARE.

Vision2:Vision2 is an IDE (Integrated Development Environment) that helps youwrite, compile, and debug embedded programs.

HOW TO WRITE SOURCE CODEHOW TO WRITE SOURCE CODE::

` Click on the Keil Vision Iconon Desktop

` The following fig will appear

` Click on the Projectmenu from the title bar

` Then Click on New Project


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SOFTWARESOFTWARE..

` Then Click on save button above.` Select the component for u r project. i.e. Atmel

` Click on the + Symbol beside of Atmel

` Select AT89S51 as shown below

` Then Click on OK

` Now your project is

ready to USE


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SOFTWARE.SOFTWARE.

` Now double click on the Target1, you would get anotheroption Source group 1 as shown in next page.

` Click on the file option from

menu bar and select new

` Now start writing programin either in C or ASM

` Now right click on Source group 1 and click on Addfiles to Group Source


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SOFTWARE.SOFTWARE.

` Now you will get another window, select as per your fileextension given while saving the file

` Now Press function key F7 to compile. Any error will appear ifso happen.

` If the file contains no error, thenpress Control+F5 simultaneously.

` Now Click on the Peripherals frommenu bar, and check your required

port as shown in fig


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SOFTWARE.SOFTWARE.

` Now keep Pressing function key F11 slowly andobserve.

` You are running your program successfully


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APPLICATIONS OF TOUCH PAD TECHNOLOGY..APPLICATIONS OF TOUCH PAD TECHNOLOGY..

` Public Information

Displays

` Customer Self-Service


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APPLICATIONS OF TOUCH PAD TECHNOLOGY..APPLICATIONS OF TOUCH PAD TECHNOLOGY..

` Computer Based

Training

` Assistive Technology


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HOW TOUCH PAD TECHNOLOGYHOW TOUCH PAD TECHNOLOGY

DIFFERENT FROM OTHER DEVICES..DIFFERENT FROM OTHER DEVICES..

` No special commands to learn

` No use of keyboards etc.

` Entering wrong information is impossible

` No fear of damage or lost of loose hardware pieces


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CONCLUSION.CONCLUSION.

` The project TOUCHPAD DESIGNING has beensuccessfully designed and tested. Integrating features of allthe hardware components used have developed it.

` Presence of every module has been reasoned out and

placed carefully thus contributing to the best working ofthe unit.

` Secondly, using highly advanced ICs and with the help ofgrowing technology the project has been successfully

implemented.

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