The servo positions itself based on the width of positive pulses fed to it. The rate at which pulses are sent to the servo is relatively unimportant(40 per second seems pretty typical). A pulse width of 1.5 milliseconds positions the servo at its center, with 1 millisecond and 2 milliseconds being the accepted limits to either side.The Parallax Basic Stamp has a command called “pulsout” that is handy to control servos. This circuit can be driven from a radio receiver or a Basic Stamp.
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