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servo motor with AVR microcontroller

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I'm about to build a 3 DOF robotic arm using servo motor. i have no experience using servo motor. so i need to know more about the following:
1. how to interface a hobby servo motor (3 wires) with an Atmel AVR microcontroller.
2. what is the algorithm ( or even better, the C code) to drive the motor shaft a known no. of degrees.
3. what circuit simulator software has a model for the hobby servo.


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