// test a stepper motor with a Pololu A4988 driver board, onboard led will flash at each step
// this version uses delay() to manage timing
byte directionPin = 8;
byte stepPin = 9;
const int ledPin = 3;   

int numberOfSteps = 200;

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(2, INPUT);
  
  pinMode(ledPin, OUTPUT);        // set the LED pin as an output



}

void loop() { 
    // read the value of the potentiometer
  int stepValue =  digitalRead(stepPin);
  
  // map the potentiometer value to a range suitable for the LED
  int ledBrightness = map(stepValue, 0, 1023, 0, 255);
  
  // set the brightness of the LED
  analogWrite(ledPin, ledBrightness);
    statostart=digitalRead(2);
   if(digitalRead(2) == 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));
  }}
}