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root / arduino-1.0 / libraries / Stepper / examples / MotorKnob / MotorKnob.ino @ 58d82c77

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/*
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 * MotorKnob
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 *
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 * A stepper motor follows the turns of a potentiometer
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 * (or other sensor) on analog input 0.
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 *
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 * http://www.arduino.cc/en/Reference/Stepper
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 * This example code is in the public domain.
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 */
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#include <Stepper.h>
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// change this to the number of steps on your motor
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#define STEPS 100
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// create an instance of the stepper class, specifying
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// the number of steps of the motor and the pins it's
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// attached to
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Stepper stepper(STEPS, 8, 9, 10, 11);
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// the previous reading from the analog input
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int previous = 0;
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void setup()
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{
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  // set the speed of the motor to 30 RPMs
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  stepper.setSpeed(30);
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}
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void loop()
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{
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  // get the sensor value
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  int val = analogRead(0);
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  // move a number of steps equal to the change in the
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  // sensor reading
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  stepper.step(val - previous);
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  // remember the previous value of the sensor
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  previous = val;
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}