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1. Mouse: It is a A very common and commonly used computer input device. It can position the cursor on the current screen and operate the screen elements at the position passed by the cursor through buttons and scroll wheels. The originator of the mouse appeared in 1968. American scientist Douglas Englebart made the first mouse in California. It was named because it resembled a mouse. The standard name of "mouse" should be "mouse machine". The use of mouse is In order to make computer operation easier, instead of cumbersome keyboard instructions.

2. Working principle: Mouse is divided into mechanical mouse and optical mouse according to its different working principle. Mechanical mouse is mainly composed of rolling ball, roller and grating signal sensor. When you drag the mouse, the rolling ball is driven to rotate, and the rolling ball in turn drives the roller to rotate. The grating signal sensor installed at the end of the roller collects the grating signal.

The photoelectric pulse signal generated by the sensor reflects the displacement changes of the mouse in the vertical and horizontal directions, and is then processed and converted by the computer program to control the movement of the cursor arrow on the screen.