#include <Stepper.h>   
#define STEPS 100
Stepper stepper(STEPS, 8, 9, 10, 11);  
int previous = 0;  
void setup() {
  stepper.setSpeed(120);
  Serial.begin(9600);
}   
 void loop()
 {    
   int val = analogRead(0);
   Serial.println(val);      
   stepper.step(val - previous);     
   previous = val;
 }