#include <Servo.h>

Servo myservo;  // create Servo object to control a servo

int potpin = A0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin
int va;

//servomotor bipolar
#define STEP 13
#define DIR 12

void setup() {
  Serial.begin(9600);
  myservo.attach(9);  // attaches the servo on pin 9 to the Servo object
  pinMode(4, OUTPUT);

//servomotor bipolar
  pinMode(STEP, OUTPUT);
  pinMode(DIR, OUTPUT);

   

}

void loop() {
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  va = map(val, 0, 1023, 0, 90);     // scale it for use with the servo (value between 0 and 180)
  myservo.write(va);
  
  digitalWrite(DIR, LOW);
  for (int i = 0; i < 200; i++){    // para motor de 0.9° 200 pasos = 180°
      digitalWrite(STEP, HIGH);       // para motor de 1.8° se requieren solo 100 pasos
      delay(10);
      digitalWrite(STEP, LOW);
      delay(10);
    }

  digitalWrite(DIR, LOW);       
  for (int i = 0; i < 200; i++){ 
    digitalWrite(STEP, HIGH);    
    delay(10);
    digitalWrite(STEP, LOW);
    delay(10);
  }


  if (va>=90){
    digitalWrite(4, HIGH);
  } 
  else {
    digitalWrite(4, LOW);
  }                 // sets the servo position according to the scaled value
  delay(15); // waits for the servo to get there
  Serial.println(val);
                             
}