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Mouse and Keyboard

Mouse and Keyboard . Aaron Nirmaier. History of Keyboard. Computer keyboard started in 1714. Looked like a sewing machine because Remington was the manufacture they mad sewing machines They were not for commercial use but used for legal documents

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Mouse and Keyboard

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  1. Mouse and Keyboard Aaron Nirmaier

  2. History of Keyboard • Computer keyboard started in 1714. • Looked like a sewing machine because Remington was the manufacture they mad sewing machines • They were not for commercial use but used for legal documents • Christopher Latham Scholes created the type writer that is more common today in 1877.

  3. History of Keyboard • The teletype was a combination of the typewriter with a telegraph. • Teletype was used to input data in the first computer and is where the development of the keyboard started.

  4. How a Keyboard Works • Working:The keyboard itself is a mini computer and beneath the keys lies a circuit. The circuit has a switch underneath each key. When a key on the keyboard is pressed, it acts like a miniature switch and lets a small current flow through it into a processor in the keyboard. This processor in the keyboard detects the current and sends a signal through a cable to the central processing unit of the computer, which then understands the command and operates accordingly

  5. Inside of a Keyboard • The key matrix is a grid of circuits underneath the keys. • Each circuit is broken at a point below each key. • When you press a key it presses a switch completing the circuit and allowing tiny amount of current flow. • The mechanical action of the switch causes some vibration aka a bounce which the processor filters out. • Character Map tells the processor the position in the matrix and what each keystroke or combination represents.

  6. Keyboard Switches • Each key is spring-loaded and has a tiny plate attached to the bottom of it. • Rubber dome • Membrane • Metal Contact • Foam element

  7. Common Control Keys • Home • End • Insert • Delete • Page up/down • Control (ctrl) • Escape (Esc)

  8. History of the Mouse • 1968 Douglas Engelbart introduces what he calls the “xyp Position Indicator for a Display System” in San Francisco. It was a chunky wooden block with one button. A cord was attached to the back of the device like a tail that how it got the name the mouse. • 1972 Bill Englsih invents the ball mouse a single ball that could rotate in all directions.

  9. History of Mouse • 1984 Steve Job refines the ball mouse idea and introduces his version with the new Apple macintosh. • 1985 Microsoft launches its graphic user interface. • Today From motion-detecting, handheld controllers , touch screens the computer mouse could be the next endangered species.

  10. How it works • 1. A ball in side the mouse touches the desk and rolls when the mouse moves. • 2. There are two rollers in the mouse that touch the ball. One of the rollers detects motion in X direction the other is 90 degrees to the first roller so it can get the direction in Y direction.

  11. How it works • 3. Each of the rollers connect to a shaft. And it spins a disk with holes in it. • 4 On either side of the disk is a infrared Led and a infrared sensor. The holes in the disk break the beam of light coming from the LED so that infrared sensor sees pulses of light. The rate of the pulsing is directly related to the speed of the mouse and the distance it travels.

  12. How it Works • 5 An on-board processor chip reads the pulses from the infrared sensors and turns them into binary data that the computer can understand . It is sent through the mouse’s cord. • 6 In this optomechanical arrangement the disk moves mechanically and a optical system counts pulses of light.

  13. Optical Mouse • In late 1999 the optical mouse was created that actually uses a tiny camera to take 1,500 pictures every second. • Able to work on almost any surface, the mouse has a small, red light-emitting diode (LED) that bounces light off that surface onto a complementary metal-oxide semiconductor (CMOS) sensor

  14. Optical Mouse • The CMOS sensor sends each image to a digital signal processor (DSP) for analysis. The DSP, operating at 18 MIPS (million instructions per second), is able to detect patterns in the images and see how those patterns have moved since the previous image • the DSP determines how far the mouse has moved and sends the corresponding coordinates to the computer. The computer moves the cursor on the screen based on the coordinates received from the mouse. This happens hundreds of times each second, making the cursor appear to move very smoothly

  15. Optical Mouse • •No moving parts means less wear and a lower chance of failure. • •There's no way for dirt to get inside the mouse and interfere with the tracking sensors. • •Increased tracking resolution means smoother response. • •They don't require a special surface, such as a mouse pad

  16. Types Keyboards • Microsoft • Micro • Intel • Razer • Samsung • Sony • Ultra • Acer

  17. Types of Mouse • Razer • Logitech • Microsoft • Gigabyte • Corsair • Mionix • HP

  18. Wireless • Connect the receiver to the computer. If your computer has a USB port (as most do), plug your receiver into an available port. There will also be a green adapter supplied, in the event that your system requires the use of the mouse port. Caution—don't try and force the mouse adapter into the keyboard port!

  19. Wireless • The mouse receiver has a USB plug (left), but can also plug into the mouse plug through the adapter it came with (right). If your receiver plugs into the USB port it should look like the left. If it plugs into the mouse plug it should look like the one on the right, only connected to the receiver • Connect the mouse to the receiver. Place the mouse in close proximity to the receiver, and note the following: • The receiver should have a visible button that is easily pushable by the average human finger. • The mouse will usually have a very small reset button in a hole on the bottom that can be pushed by something like a pencil or paper clip. • Push both buttons at the same time with the receiver and the mouse relatively close to each other for about 5 seconds or more

  20. Wireless • Find a permanent position the receiver. Place the receiver where it won't be far away from the mouse. Depending on where you are, you can place it on the monitor, on the tower, on the back of your laptop (if you are installing the mouse to your laptop) or on the desk. • The furthest a wireless mouse can get away from the receiver and still function is about 9 feet (2.7 meters), so keep that in mind

  21. Wireless • Test your new mouse. • If you plugged into the mouse port, restart your computer. • If you plugged it into the USB port you should be able to use it immediately. • When the cursor moves when you move the mouse, you have connected the mouse properly. If the cursor doesn't move, try repositioning the receiver. If it still doesn't work, you may need to restart your computer (if you haven't already) or reconnect everything.

  22. References • http://www.howstuffworks.com/mouse2.htm • http://scilifestyle.com/the-history-of-the-computer-keyboard.html • http://www.thegeminigeek.com/how-does-a-computer-keyboard-work/ • My Dad

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