Curved Rod Barn Door Tracker, DIY

// This sketch is for the stepper motor controlled Barn Door

long Distance = 0;
// DelayTime is the total Delay per cycle in MicroSeconds
// The Higher the number, slower it will go
long DelayTime = 9000;
// MaxUp is the upper limit count and will need to be set 
// depending on the length of the threaded Rod
long MaxUp = 800000;

// Analog Input pins to monitor Switch Positions for speed
// and direction
int swPinA  =  2;
int swPinB  =  3;
int swA   = 0;  
int swB   = 0;


void setup() 
  {               
  pinMode(8, OUTPUT);     
  pinMode(9, OUTPUT);
  pinMode(swPinA,  OUTPUT);
  pinMode(swPinB,  OUTPUT);  
// You can turn the serial monitor and watch the numbers 
// to set the MaxUp value if you want by uncommenting out
// all of the serial commands in this code and using the 
// Serial Monitor window to watch what is happening.
//  Serial.begin(9600);
  }


void loop() 
  {
    swA = analogRead(swPinA);
    swB = analogRead(swPinB);
    if(Distance < 0)
    {
      Distance = 0;
    }

//    Serial.print("A- ");
//    Serial.print(swA);
//    Serial.print("   B- ");
//    Serial.println(swB);
//    Serial.println(Distanc​e);

    if(swB<=500)
    {
      if(swA>500)
      {
//        Serial.print("Down - Slow");
        if(Distance > 0)
        {
          DownSidereal();
        }
        else
        {
          //Do NOTHING
        }
      }
      if(swA<=500)
      {
//        Serial.print("Down - Fast");
        if(Distance > 1999)
        {
        FastDown();
        }
        else
        {
          //Do NOTHING
        }
      }
    }
    if(swB>500)
    {
      if(swA>500)
      {
//        Serial.print("Up - Slow");
        if(Distance < MaxUp)
        {
        UpSidereal();
        }
        else
        {
          //Do NOTHING
        }
      }
      if(swA<=500)
      {
//        Serial.print("Up - Fast");
        if(Distance < MaxUp)
        {
        FastUp();
        }
        else
        {
          //Do NOTHING
        }
      }
    }
  }
    

  
void DownSidereal()
  {
  MoveDirection(1);
  digitalWrite(9, HIGH);
  delayMicroseconds(Dela​yTime / 2);     
  digitalWrite(9, LOW); 
  delayMicroseconds(Dela​yTime / 2);     
  Distance = Distance - 1;    
  }

void UpSidereal()
  {
  MoveDirection(2);
  digitalWrite(9, HIGH);
  delayMicroseconds(Dela​yTime / 2);     
  digitalWrite(9, LOW); 
  delayMicroseconds(Dela​yTime / 2);     
  Distance = Distance + 1;    
  }

  
void FastUp()
  {
    for(int x = 0; x<1000; x++)
    {
      MoveDirection(2);
      digitalWrite(9, LOW);
      delayMicroseconds(75);     
      digitalWrite(9, HIGH); 
      delayMicroseconds(75);    
      Distance = Distance + 1;    
    }
  }
  
  
void FastDown()
  {
    for(int x = 0; x<1000; x++)
    {
      MoveDirection(1);
      digitalWrite(9, HIGH);
      delayMicroseconds(75);     
      digitalWrite(9, LOW); 
      delayMicroseconds(75);     
      Distance = Distance - 1;    
    }
  }
  
  
void MoveDirection(int Direction)
  {
    // 1 = Down, 2 = Up 
    if (Direction == 1)
      {
        digitalWrite(8, HIGH);
        digitalWrite(9, LOW);
      }
      else
      {
        digitalWrite(8, LOW);
        digitalWrite(9, HIGH);
      }      
  }