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The EduRobot doesn't actually include any servos. Those little boxes that look exactly like a servo are actually very small multi-speed, reversible motors that work exactly like a regular motor: values greater than 127 cause it to turn one direction, and values less than 127 cause it to turn the other direction.
If you want position data, you'll need to hook up an extra potentiometer. If I remember right, any 100k ohm pot should work just fine.
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