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Revision to Using servos and controlling unused IO pins

Tony

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+== Introduction ==
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+The Gcodes [[Gcode#Section_M42_Switch_I_O_pin|M42 Switch I/O pin]] and [[Gcode#Section_M280_Set_servo_position|M280 set servo position]] allow direct control of some pins, or re-purposing of those pins to control PWM hobby servos
== Important note on connecting servos ==

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