General description

The track–ball assembly is used as an I/O device for military consoles, it consists of two main parts:

  • Trackball
  • Buttons
  • Interface

Principle of operation

Track-ball, as the name suggests, is made up of a rigid “ball” that can rotate on itself. The speed and direction of the ball is obtained using two encoders, one on the X axis and the other on the Y axis.

The direction is derived from the phase between the two encoder signals.

One of the two encoder signals is used as a clock and the other identifies the direction, the speed of the pulses over time gives the module of the displacement over time.

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Technical Specifications