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

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/* 
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 Stepper Motor Control - speed control
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 This program drives a unipolar or bipolar stepper motor. 
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 The motor is attached to digital pins 8 - 11 of the Arduino.
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 A potentiometer is connected to analog input 0.
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 The motor will rotate in a clockwise direction. The higher the potentiometer value,
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 the faster the motor speed. Because setSpeed() sets the delay between steps, 
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 you may notice the motor is less responsive to changes in the sensor value at
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 low speeds.
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 Created 30 Nov. 2009
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 Modified 28 Oct 2010
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 by Tom Igoe
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 */
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#include <Stepper.h>
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const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
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// for your motor
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// initialize the stepper library on pins 8 through 11:
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Stepper myStepper(stepsPerRevolution, 8,9,10,11);            
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int stepCount = 0;         // number of steps the motor has taken
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void setup() {
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  // initialize the serial port:
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  Serial.begin(9600);
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}
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void loop() {
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  // read the sensor value:
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  int sensorReading = analogRead(A0);
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  // map it to a range from 0 to 100:
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  int motorSpeed = map(sensorReading, 0, 1023, 0, 100);
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  // set the motor speed:
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  if (motorSpeed > 0) {
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    myStepper.setSpeed(motorSpeed);
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    // step 1/100 of a revolution:
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    myStepper.step(stepsPerRevolution/100);
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  } 
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}
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