// test a stepper motor with a Pololu A4988 driver board, onboard led will flash at each step
// this version uses delay() to manage timing
#include <Stepper.h>
const int stepsPerRevolution = 200; 
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

int preValue=0;

byte directionPin = 8;
byte stepPin = 9;
int pushbutton=2;
int numberOfSteps = 200;
byte ledPin = 13;
int pulseWidthMicros = 20;  // microsecondo
int millisbetweenSteps = 10; // milliseconds - or try 100 for slower steps
int statostart;
void setup() { 
  Serial.begin(9600);
  Serial.println("Starting StepperTest");
  digitalWrite(ledPin, LOW);
  pinMode(directionPin, OUTPUT);
  pinMode(stepPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(pushbutton, INPUT);
  myStepper.setSpeed(50);
  
  pinMode(A0, INPUT);
  // initialize the serial port:
  Serial.begin(9600);
}

void loop() { 
    statostart=digitalRead(pushbutton);
   if(digitalRead(pushbutton) == HIGH)
   {
    digitalWrite(directionPin, HIGH);
    for(int n = 0; n < numberOfSteps; n++) 
    {
     digitalWrite(stepPin, HIGH);
     delayMicroseconds(pulseWidthMicros); 
     digitalWrite(stepPin, LOW);
     delay(millisbetweenSteps);
     digitalWrite(ledPin, !digitalRead(ledPin));
   }
    delay(1000);
    digitalWrite(directionPin, LOW);
    for(int n = 0; n < numberOfSteps; n++)
     {
    digitalWrite(stepPin, HIGH);
    // delayMicroseconds(pulseWidthMicros); // probably not needed
    digitalWrite(stepPin, LOW);
    delay(millisbetweenSteps);
    digitalWrite(ledPin, !digitalRead(ledPin));
  }
  }
  int potential_value=analogRead(A0);
  int value=map(potential_value,0,1023,0,200);
  
  Serial.println(value);
  myStepper.step(value-preValue);
  preValue=value;
  
  //delay(1500);
}