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Originally Posted by tml240
are the servos in digital or analogue?
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The true answer here is both. The PWM data represents a particular angular position. The output shaft of the servo has a pot connected to it that outputs an analog voltage relative to the position. The circuit inside the servo then compares the position it was told to go to and the position it is currently at and sends a signal to the motor to move. When the output shaft/pot are at the position the PWM signal wants it to be the motor is shut off. This type of positioning is very common and can be accomplished fully digital, fully analog (this is the way it was done before the advent of cheap micros and memory modules) or a combination of both. The final design is one in which the tradeoffs between accuracy and expense have resulted in a fairly repeatable little box that costs under $50.