This is a tiny trackball akin to those found on a number of Blackberry models (8100, 8300, 8320, 8800, 8830, etc). Each of the four spindles have a tiny circular magnet on each end. Great when paired with very small SMD Hall effect sensors.
Ball is clear to allow for LEDs placed underneath to light up the ball.
Breakout board listed below
SFE Eagle Library has this part!
If you are interested in Internet of Things (IoT) or M2M projects check our open source sensor platform Waspmote which counts with more than 100 sensors available to use 'off the shelf', a complete API with hundreds of ready to use codes and a low consumption mode of just 0.7µA to ensure years of battery life.
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