#include <Stepper.h>

// change this to the number of steps on your motor
#define STEPS 100

// create an instance of the stepper class, specifying
// the number of steps of the motor and the pins it's
// attached to
Stepper stepper1(STEPS, 8, 9, 10, 11);
Stepper stepper2(STEPS, 2, 3, 4, 5);

// the previous reading from the analog input
int previous1 = 0;
int previous2 = 0;

void setup() {
  // set the speed of the motor to 30 RPMs
  stepper1.setSpeed(30);
  stepper2.setSpeed(30);
}

void loop() {
  // get the sensor value
  int val1 = analogRead(0);
  int val2 = analogRead(A1);
  // move a number of steps equal to the change in the
  // sensor reading
  stepper1.step(val1 - previous1);
  stepper2.step(val2 - previous2);
  // remember the previous value of the sensor
  previous1 = val1;
  previous2 = val2;
}