Wireless computer keyboard
A keyboard in which wireless transmission is performed is called a wireless keyboard. The wireless keyboard has advantages such as the installation and operation become simple because wiring cable is not needed for data transmission to computer, and numbers of users are able to use a computer simultaneously by connecting numerous keyboards to a computer. Wireless keyboards give the user the additional freedom to make data entries without requiring the user to sit proximate to the computer system. The avoidance of wiring becomes increasingly significant as more add on peripherals are included in typical computer systems which can result in workplace clutter. The wireless keyboards currently available are either infrared based or RF based transmission systems. An infrared wireless keyboard simply uses an infrared transmitter in the keyboard and an infrared receiver in a computing apparatuses to establish a link between the keyboard and the computing apparatus. The infrared wireless keyboard, however, requires no obstacle in a path between the infrared transmitter in the keyboard and the infrared receiver in the computers. RF wireless keyboards do not suffer from this problem. RF keyboards are increasingly being used for wireless keyboards over infrared systems due to their performance advantages. In a wireless keyboard, a micro-controller scans the key matrix to detect which keys are pressed, and transmits key data corresponding to the pressed keys via infrared or radio waves. Each time the keyboard sends a wireless key make code to the host computer indicating that a key has been depressed, the host computer awaits a key break code indicating that the key has been released.
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