#include <Stepper.h>

int isObstaclePin = 7;
const int stepsPerRevolution = 7600;
int isObstacle = HIGH;
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

void setup() {
  myStepper.setSpeed(60);
  pinMode(isObstaclePin, INPUT);
  Serial.begin(9600);
 }

void loop()
{
isObstacle = digitalRead(isObstaclePin);
  if (isObstacle == LOW){
   Serial.println("OBSTACLE!!, OBSTACLE!!");
   myStepper.step(stepsPerRevolution);
  }
  else {
    Serial.println("clear");
    myStepper.step(-stepsPerRevolution);
  }
  delay(200);
}