int LimitSwitchUpPin = 11;
int LimitSwitchDownPin = 10;

// Motor A
int in1 = 9;
int in2 = 8;

// Motor B
int in3 = 7;
int in4 = 6;

// Motion Sensor Setup
const int led = 13;
const int mspin = A0;


void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  pinMode(mspin, INPUT);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
  pinMode(in3, OUTPUT);
  pinMode(in4, OUTPUT);
}

void loop() {
  int msStatus = analogRead(mspin);
  Serial.println(msStatus);
  if (msStatus < 500) {
    digitalWrite(led, HIGH);
    Serial.println("Motion appeard, Led is ON");
    moveMotors();
  }
  if (digitalRead(LimitSwitchDownPin)) {
    turnOFF();
    delay(5000);
    reverse();
  }
  if (digitalRead(LimitSwitchUpPin)) {
    turnOFF();
    Serial.println("STOP");
  }

}//end of loop


void turnOFF() {
  digitalWrite(in1, LOW);
  digitalWrite(in2, LOW);
  digitalWrite(in3, LOW);
  digitalWrite(in4, LOW);
}

void reverse() {
  digitalWrite(in1, LOW);
  digitalWrite(in2, HIGH);
  digitalWrite(in3, LOW);
  digitalWrite(in4, HIGH);
}

void moveMotors() {
  //Turn on motor A
  digitalWrite(in1, HIGH);
  digitalWrite(in2, LOW);
  //Turn on motor B
  digitalWrite(in3, HIGH);
  digitalWrite(in4, LOW);
}