#define button A7
#define relay A5
#define time_hold 6000
int val = 0;
int i = 0;
long previousMillis;
long previousMillis2;
bool relay_stt = false;
bool relay_stt2 = false;
bool hold = true;
String input;

void setup() {
  Serial.begin(9600);
  pinMode(button, INPUT_PULLUP);
  pinMode(relay, OUTPUT);
  relay_stt = false;
}

void read_button()
{
  val = analogRead(button);
  //Serial.println(val);
  if (val > 1010)
  {
    i++;
  }
  else if (val < 1010)
  {
    i = 0;
  }
  if (i > 500)
  {
    digitalWrite(relay, HIGH);
    relay_stt = true;
    relay_stt2 = true;
    previousMillis = millis();
    if (i == 503)
    {
      Serial.println("open");
    }
  }
}

void serial_read()
{
  while (Serial.available() > 0) {
    input = Serial.readStringUntil('\r');
    Serial.println(input);
    if (input == "1")
    {
      digitalWrite(relay, HIGH);
      relay_stt = true;
      previousMillis = millis();
      Serial.println("open");
    }
  }
}
void loop()
{
  //unsigned long currentMillis = millis();
  read_button();
  serial_read();
  if ((millis() - previousMillis > time_hold) && relay_stt == true && val <1010)
  {
    relay_stt = false;
    digitalWrite(relay, LOW);
    Serial.println("close");
    previousMillis = millis();
  }
  //  if ((millis() - previousMillis2 > time_hold) && relay_stt2 == true)
  //  {
  //    relay_stt2 = false;
  //    digitalWrite(relay, LOW);
  //    Serial.println("Close door by usb");
  //    previousMillis2 = millis();
  //  }
}