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Explain Trackball and Its working in Detail

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Trackball and Its working in Detail

Hey viewers, Welcome again to my new article Trackball and It’s working in Detail. In this article, I am going to share you about Trackball in detail with its working also. So without wasting your time lets get started.


The trackball is another pointing device that resembles a ball nestled in a square cradle and serves as an alternative to a mouse. In general, a trackball is as if a mouse is turned upside down. It has a ball which can be rotated by fingers in any direction, the cursor moves accordingly.

The size of the ball in the trackball varies from as large as a cue ball, to as small as a marble. Since it is a static device, instead of rolling the mouse on top of the table the ball on the top is moved by using fingers, thumbs, and palms.

Working of Trackball :

A trackball consists of a number of components. As one moves the trackball, it starts a chain of events inside the box that results in the pointer moving on the computer screen. In a normal trackball, on one side of each encoding wheel is a pair of Light Emitting Diode that emits infrared light. On the opposite side of each pair of LEDs, there is a light sensor. Every time light from the LEDs shines through a hole in the encoding wheel, a pulse of electricity is sent from the light sensor to the microprocessor.

When the trackball rolls side-to-side, the horizontal (X-axis) shaft rotates, spinning the attached encoder wheel. Similarly, when the trackball is rolled up and down, the vertical (Y-axis) shaft rotates, spinning the attached encoder wheel. Due to this spinning, the light blinks which can be detected by the light sensor. The microprocessor counts how many times the light sensors detect light each second and send this information to the computer along with the cord.

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