 
 int noAction = STAYSTILL;
 
+bool reactive = true;
 
 int const RELAXED = 0;
 int const PHOTOTROPISM = 1;

      case '+':
        interval = 2000;
        break;
      default:
        if (48 < incomingByte && incomingByte < 58)
        {

      Serial.print("OBSTACLE !");Serial.println(distance);
    }

    if (reactive) 
    {
      motorstate = MOVE_BACKWARDS;
      interval = 100;
    }
  } else {
    //motorstate=STILL;
    //digitalWrite(led,LOW);
