// https://wokwi.com/projects/364535266637057025
// for https://forum.arduino.cc/t/stepper-motor-control-using-millis/1126030

#define dirPin 2
#define stepPin 3

void setup() {
  // Declare pins as output:
  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
  
  Serial.begin(115200);

for (int i=0; i<=20; i++) { 
digitalWrite(dirPin, HIGH); //direction.
digitalWrite(stepPin, HIGH);
delay(250);
digitalWrite(stepPin, LOW);
delay(250);
}
delay(5000);
for (int i=20; i>=0; i--) { 
digitalWrite(dirPin, LOW); //direction.
digitalWrite(stepPin, HIGH);
delay(250);
digitalWrite(stepPin, LOW);
delay(250);
}

}

void loop() {
int pval=analogRead(A0);
Serial.print(pval);
Serial.print("  ");
for (int i=0; i<=pval; i++) { 
digitalWrite(dirPin, HIGH); //direction.
digitalWrite(stepPin, HIGH);
Serial.println(analogRead(A1));
delay(analogRead(A1));
digitalWrite(stepPin, LOW);
delay(analogRead(A1));
}
delay(2000);
for (int in=pval; in>=0; in--) { 
digitalWrite(dirPin, 0); //direction.
digitalWrite(stepPin, HIGH);
Serial.println(analogRead(A1));
delay(analogRead(A1));
digitalWrite(stepPin, LOW);
delay(analogRead(A1));
}
delay(1000);
}