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I haven't personally used the HiTechnic sensors, but the difference between a gyroscope and a compass is that one measures absolute orientation and the other measures change in orientation. The compass measures absolute orientation via a magnetometer that measures the effect of the Earth's magnetic field on the sensor. The gyro sensor uses some form of MEMS ...


That picture is quite blurry, but I'm pretty sure it's 8466 4x4 Off Roader from 2001: The wheels in the picture look like they are metallic silver, and I think this is the only set of this size with metallic silver wheels and lime accents.


This depends on how deep engineering principles do you wish to teach. For simpler, shallower things, like the inherent stability of a triangle based construction versus a square based, the crawler crane already offers a lot: the relation between force and leverage, skid steering, gearing, pulleys, gearboxes, electronics. Pneumatics and shock absorbers are ...

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