// 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;
int numberOfSteps = 10 ;
byte ledPin = 13;
int pulseWidthMicros = 20;  // microsecondo
int millisbetweenSteps = 10; // milliseconds - or try 100 for slower steps


float pos = 0; // Variable where the stepper position will be stored (in steps)

void setup() { 
  Serial.begin(9600);
  Serial.println("Start");
  digitalWrite(ledPin, LOW);
  pinMode(directionPin, OUTPUT);
  pinMode(stepPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(2, INPUT);
  pinMode(3, INPUT);


     digitalWrite(ledPin, !digitalRead(ledPin));

       Serial.println(pos);
    }
    

void loop() {
  
    if(digitalRead(3) == HIGH){
       Serial.println("shift down");
   digitalWrite(directionPin, LOW);
    for(int n = 0; n < numberOfSteps; n++) {
     digitalWrite(stepPin, HIGH);
     delayMicroseconds(pulseWidthMicros); 
     digitalWrite(stepPin, LOW);
     delay(millisbetweenSteps);
     digitalWrite(ledPin, !digitalRead(ledPin));
     delay(20);
     digitalWrite(ledPin, !digitalRead(ledPin));
    }
    pos-=1;
   Serial.println(pos);
   delay(200);

   }}