SWARNANDHARA ENGINEERING COLLEGE
(VIJETHA INSTITUTE OF TECHNOLOGY &SCIENCE)
NAME: P.JAHNAVINAME: K.SIREESHA
ROLL NO: 097C1A0443 ROLL NO: 097C1A0438
Iv/IV B-TECH, ECEIV/IV B-TECH, ECE
Computing is now not limited to desktops and laptops, it has found its way into mobile devices like palm tops and even cell phones. But what has not changed for the last 50 or so odd years is the input device, the good old QWERTY keyboard. Virtual Keyboard uses sensor technology and artificial intelligence to let users work on any surface as if it were a keyboard. Virtual Devices have developed a flashlight- size gadget that projects an image of a keyboard on any surface and let’s people input data by typing on the image. The Virtual Keyboard uses light to project a full-sized computer keyboard onto almost any surface, and disappears when not in use. Used with Smart Phones and PDAs, the VKEY provides a practical way to do email, word processing and spreadsheet tasks, allowing the user to leave the laptop computer at home. 1. INTRODUCTION
Virtual Keyboard is just another example of today’s computer trend of ‘smaller and faster’. Computing is now not limited to desktops and laptops, it has found its way into mobile devices like palm tops and even cell phones. But what has not changed for the last 50 or so odd years is the input device, the good old QWERTY keyboard. The virtual keyboard technology is the latest development. The virtual keyboard technology uses sensor technology and artificial intelligence to let users work on any flat surface as if it were a keyboard. Virtual Keyboards lets you easily create multilingual (more than one language) text content on almost any existing platform and output it directly to PDAs or even web pages. Virtual keyboard , being a small, handy, well-designed and easy to use application turns into a perfect for cross platform text input. The main features are: platform independent multilingual support for keyboard text input, build in language layouts and setting/ copy/ past etc. Operations support just as in a regural text editor, no change in already existing system language settings, easy and user-friendly interface and design, and small file size. 2. QWERTY KEYBOARD
INTRODUCTION: QWERTY is the most common keyboard layout on English language computers and typewriter keyboards. Its takes its name from the first six characters seen in the far left the keywords top first row of letters Working of QWERTY Keyboard:
1. When a key is pressed, it pushes down on a rubber dome sitting beneath the key. A conductive contact on the underside of the dome touches (and hence connects) a pair of conductive lines on the circuit below.
2. This bridges the gap between them and allows electric current to flow (the open circuit is closed).
3. A scanning signal is emitted by the chip along the pairs of lines to all the keys. When the signal in one pair becomes different, the chip generates a "make code” Corresponding to the key connected to that pair of lines.
4. The code generated is sent to the computer either via a keyboard cable (using on- Off electrical pulses to represent bits) or over a wireless connection. It may be Repeated.
5. A chip inside the computer receives the signal bits and decodes them into the appropriate key press. The computer then decides what to do on the basis of the key pressed (e.g. display a character on the screen, or perform some action).
6. When the key is released, a break code (different than the make code) is sent to indicate the key is no longer pressed. If the break code is missed (e.g. due to a keyboard switch) it is possible for the keyboard controller to believe the key is pressed down when it is not, which is why pressing then releasing the key again will release the...