Wireless RGB Projector Computer Science Essay Free Essay Example

A projector is to expose images from computing machine or laptop. The term radio is used to depict how the projector receive the signal. Presentation projector ever holding wire muss up here and at that place, this is where wireless projector comes in. It solve the job of wiring by conveying without wire utilizing wireless engineering such as Bluetooth, wireless frequence and Wi-Fi. Currently there are many types of projectors such as image projector, film projector and etc. This undertaking is about directing informations utilizing wireless frequence from a sender to receiver.

This undertaking will be utilizing RS-232 port that is connected to a Personal computer. There will hold 2 circuit boards that has a microcontroller. The conveying board will be the topographic point where procedure the informations that come from a Personal computer and send to the receiving system board. From receiver board, it will decrypt the information from digital to analog utilizing digital to analog transition. Last the informations will be send to projector.

The purpose for this undertaking is to plan a device that will convey signal from a laptop/desktop to a presentation projector through wirelessly. It will be utilizing radio frequence to convey the information.

There are few of aims in this undertaking. The chief aim is to plan a sender and receiver device that will work with a Personal computer and a presentation projector. Before can accomplish the chief aim there are minor aim that is of import to accomplish the chief aim. It is to understand RGB protocol and signaling.

Then following is to understand assorted types of radio engineering that is available to convey and have the information. After that understand how a presentation projector receive informations and decrypt the information.

Chapter 2: Literature reappraisal

2.1 Radio

Wireless is a reassigning information without utilizing any wires over a distance, it can be short like few metres or long distance like kilometres. Wireless is one of the most celebrated telecommunication subdivisions.

Nowadays radio is widely used by a batch of devices, such as bipartisan wireless, cellular phone, Television, GPS, mouse, keyboard, and radio networking.

There are few ways of making wireless transmittal:

a ) Radio frequence ( RF )

B ) Infrared

degree Celsius ) Bluetooth

vitamin D ) Wi-Fi

2.1.1Radio Frequency ( RF )

Radio frequence is frequence that lower than 300Ghz with a wavelength of 100km to 1mm. This scope of electromagnetic scope constitute a wireless spectrum with refer to the portion of electromagnetic spectrum.

Figure 1: Radio spectrum [ 1 ]

Radio moving ridges are manner longer compare to other of the electromagnetic spectrum, wireless moving ridges are divided to few sets harmonizing to their wavelength and function different intent and different sort of telecommunication. [ 1 ]

Set

Frequency

Wavelength

Very low frequency

3-30kHz

100km-10km

Low frequency

30-300kHz

10km-1km

Medium frequency

300kHz-3MHz

1km-100m

Hafnium

3-30MHz

100m-10m

Hemorrhagic fever

30-300MHz

10m-1m

Ultrahigh frequency

300MHz-3GHz

1m-10cm

Superhigh frequency

3-30GHz

10cm-1cm

Extremely high frequency

30-300GHz

1cm-1mm

Table 1: Features of different sets [ 1 ]

2.2 Video [ 2 ]

The most common digital signals used are RGB and YCbCr. The typical order of diminishing picture quality is:

HDMI ( Digital YCbCr )

HDMI ( Digital RGB )

Analog YPbPr

Analog RGB

Analog S-Video

Analog composite

Video is ever considered as uninterrupted image gesture but really it is a series of still images due to fast altering that it looks like uninterrupted image gesture. The typical picture refresh rate is 50 or 60 times per second for consumer picture and 70 to 90 times per second for computing machine.

The perpendicular and horizontal sync information is normally transferred in one of three ways:

Separate horizontal and perpendicular sync signals.

Separate composite sync signal.

Composite sync signal embedded within the video signal.

Most CRT based shows are still interlaced while LCD, plasma and computing machine shows are progressive. Enhanced-definition picture is normally defined as holding 480 or 576 progressive active scan lines and is normally called “ 480p ” and “ 576 ” severally. Standard-definition is interlaced and enhanced-definition is progressive.

Figure 2: Progressive shows “ Paint ” the lines of an image consecutively one after another

Figure 3: Interlaced displays “ Paint ” first one-half of the image ( Odd Lines ) so the other half ( Even Lines )

2.3 Color infinites [ 2 ]

A three dimensional, Cartesian co-ordinate system is use to stand for Red, Green, Blue that are the three primary linear colourss.

Figure 4: The RGB colour regular hexahedron [ 2 ]

The figure above demoing RGB values for 100 % amplitude, 100 % saturated colour bars. It is usage for common picture trial signal.

Table 2: RGB colour bars [ 2 ]

2.4 RS-232

Recommended Standard 232 that is normally known is RS-232 is a criterion for consecutive binary single-ended informations and control signals linking between a Data Terminal Equipment and a Data Circuit-terminating Equipment. It is normally used in computing machine series ports. The standard defines the electrical features and timing of signals, the significance of signals and the physical size and pinout of connections. [ 3 ] There are 3 types of pin available that is 4, 9 and 25. This port is use to allow a Personal computer communicate with microcontroller.

Figure 5: 9-Pin “ AT ” Style [ 4 ]

2.5 Encoding technique [ 5 ]

In order to interchange informations between 2 devices, a signal encryption technique is needed to do certain that the 2 devices can direct and have the informations right. A digital signal is a sequence of distinct, discontinuous electromotive force pulsations, each pulsations is a signal component. Binary informations will be transmitted by encoding each information into signal elements. The simplest manner to encoding is one-to-one correspondence between spots and signal. However there are a batch more complex encryption technique to better the public presentation and security to guarantee the information is exchange fast and safe. There is a batch of encoding strategy that we can utilize but we need to compare each encoding strategy and choose the most suited strategy.

These are the few specification of the strategy that we need to compare:

a ) Signal spectrum-the higher the frequence, more bandwidth require, supplying isolation

B ) Clocking-used to synchronise the informations exchange between sender and receiving system to supply the right timing.

degree Celsius ) Error detection-to guarantee the information is send and receive right ; higher public presentation of mistake detection=better security

vitamin D ) Cost and complexity-higher signal rate cause higher cost, some codifications require more signal rate than informations rate.

There are 4 types of encoding strategies:

a ) NRZ-L ( nonreturn to zero degree )

B ) NRZ-I ( nonreturn to zero inverter )

degree Celsius ) Manchester coding

vitamin D ) Differential Manchester

Among the 4 encoding strategy, Manchester coding have the most security and higher clock. Therefore it is the normally usage for encoding and decrypting strategy.

2.6 Comparing similar merchandises

Merchandise Name

Specification

Panasonic PT-LB10NTU Projector

Panasonic PT-LB10NTU [ 6 ]

Professionals: A Support for most wireless cards, great image quality – even for presentations in radio manner, easy to setup and utilize. [ 6 ]

Cons: A Projector ships with merely one type of connexion overseas telegram – VGA. [ 6 ]

Drumhead: A Panasonic takes radio to a new degree with wide support and fast and easy connexion of up to 4 Personal computers, user-friendly characteristics and high brightness in a slender 4.9 pound. [ 6 ]

Dell S300wi ProjectorDell S300wi [ 7 ]

Professionals: It ‘s synergistic. No standardization. Short throw. Good informations image quality. Acceptably bright image for a little to mid-size room. Good connectivity. Good sound. [ 7 ]

Cons: Sluggish synergistic response. Below par brightness uniformity. Useable but low quality picture. Reasonably obvious rainbow artefacts. Limited 3D. [ 7 ]

Canon LV-8215 ProjectorCanon LV-8215 [ 8 ]

Professionals: Image Quality. Resolution. Audio Quality. Portability. Lamp Life. 3-Year Warranty. [ 8 ]

Cons: Fan noise. No User Memory. Maintenance. [ 8 ]

Table 3: Comparison with assorted merchandises

2.7 Critical analysis

Most of the merchandises have some particular characteristic. All of the 3 are wireless projector that has assorted characteristics and come from different maker. Dell S300wi ‘s synergistic characteristic is really good characteristic because it has a distant and pen. The pen can travel the mouse pointer when presentation. Basically all radio projector is easy to setup and utilize so there will be no wiring job.

Chapter 3: Methodology

3.1 System

Figure 6: System block diagram

The figure above is demoing how this undertaking system works. It starts off from a Personal computer that will bring forth signal beginning so the signal will be send to microcontroller by utilizing RS-232 port. In the microcontroller, it will encode the signal so that it can direct the signal utilizing radio frequence. When the receiving system receive signal it will decrypt and direct it to projector.

3.2 Flow chart

Figure 7: Releasing factor sender

A Personal computer will direct informations through RS232 port to microcontroller so microcontroller will direct it to RF sender. Figure above is demoing how the RF sender procedure the information.

Figure 8: Releasing factor receiving system

Figure above is demoing how RF receiver process the information. It will have the informations wirelessly by utilizing wireless frequence.

3.3 Costing

No.

Components

Measure

Unit monetary value

Entire monetary value

1

PIC microcontroller

2

RM 30

RM 30

2

Printed circuit board

1

RM 20

RM 20

3

ETC

A

RM 200

RM 200

Grand sum

2

RM 250

RM 280

Table 4: Costing for constituents

In the tabular array, ETC under constituents is resistances, capacitances, rectifying tube and more.

3.4 Software

Software that will be needed for this undertaking is MPLAB. MPLAB is a package that is free to utilize. It is an incorporate toolset for the development of embedded applications consist of PIC.

Chapter 4: Restriction of undertaking

There are 2 types of projectors that is ‘Real clip ‘ projector and ‘Upload ‘ projector. The restriction for ‘Real clip ‘ projector is that it has a little hold between the sender and receiving system due to treating velocity involved in encoding and decrypting the wireless signal. Largely the consequence has small consequence but if it is playing picture and sound so the consequence can be clearly seen. This is due to the limited bandwidth of connexion. ‘Upload ‘ projector restriction is that it need a Personal computer within the scope of the projector. All of the projector need a power supply so the restriction is that it ever has to be has a overseas telegram connecting to the projector. The projector ca n’t be mobilize although it is wireless.

Chapter 5: Decision

Conclusion radio projector is a much better merchandise than the older type of projector due to wire economy.