how keyboard works - wordpress.com · 3 • each roller is attached to a wheel, known as an...
TRANSCRIPT
![Page 1: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/1.jpg)
![Page 2: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/2.jpg)
![Page 3: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/3.jpg)
How Keyboard WorksHow Keyboard Works
![Page 4: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/4.jpg)
![Page 5: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/5.jpg)
![Page 6: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/6.jpg)
![Page 7: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/7.jpg)
![Page 8: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/8.jpg)
![Page 9: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/9.jpg)
How Pointing Devices WorkHow Pointing Devices Work
![Page 10: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/10.jpg)
Mouse MekanikMouse Mekanik
![Page 11: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/11.jpg)
11
• As you move a mechanical mouse by dragging it across a flat surface, a ball—made of rubber or rubber over steel—protruding from the underside of the mouse turns in the direction of the movement.
![Page 12: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/12.jpg)
22
A h b ll i• As the ball rotates, it touches and turns two rollers mounted at a 90‐degree angle to each other. One roller responds to backand forth movementsbackand‐forth movements of the mouse, which correspond to vertical movements onscreen. The other roller senses sidewaysmovements whichmovements, which correspond to side‐to‐side movements onscreen.
![Page 13: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/13.jpg)
33
• Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers turn, they rotate the encoders.
![Page 14: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/14.jpg)
44• On the rims of each encoder are tiny metal• On the rims of each encoder are tiny metal
contact points. • Two pairs of contact bars extend from the
housing of the mouse and touch the contacthousing of the mouse and touch the contact points on each of the encoders as they pass by.
• Each time a contact bar touches a point, an electrical signal results. g
• The number of signals indicates how manypoints the contact bars have touched—the more signals, the farther you have moved the mouse.
• The more frequent the signals, the faster you’re moving the mouse. Th di i i hi h h ll i• The direction in which the rollers are turning, combined with the ratio between the number of signals from the vertical and horizontalrollers indicates the direction that the mouse isrollers, indicates the direction that the mouse ismoving.
![Page 15: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/15.jpg)
![Page 16: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/16.jpg)
66
T i i h f h• Tapping either of the buttons atop the mouse also sends a signal to thealso sends a signal to the PC, which passes the signal to the software.
• Based on how many times you click, and the
i i f hposition of the onscreen pointer at the time of the click the softwareclick, the software performs the task youwant to accomplish.
![Page 17: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/17.jpg)
Toucchh
Padd
![Page 18: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/18.jpg)
PointingSti kStick
![Page 19: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/19.jpg)
JoystickJoystick
![Page 20: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/20.jpg)
![Page 21: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/21.jpg)
Flatbed ScannerFlatbed Scanner
![Page 22: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/22.jpg)
![Page 23: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/23.jpg)
![Page 24: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/24.jpg)
![Page 25: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/25.jpg)
![Page 26: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/26.jpg)
Sound Card
![Page 27: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/27.jpg)
PalmsPalms
![Page 28: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/28.jpg)
![Page 29: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/29.jpg)
![Page 30: How Keyboard Works - WordPress.com · 3 • Each roller is attached to a wheel, known as an encoder, much as a car’s drive train is attached by its axles to the wheels. As the rollers](https://reader034.vdocuments.mx/reader034/viewer/2022042018/5e76370e9e5e6d60ea5cc5d9/html5/thumbnails/30.jpg)