Touchless Hand Gesture Door Opener

//This is the password to grant you access to change the doorCode
const String bluetoothPassword = "YourPasswordHere";

#include <EEPROM.h>
#include <LiquidCrystal.h>
#include <SoftwareSerial.h>

SoftwareSerial softSerial =  SoftwareSerial(6, 7); //setup software serial (rxPin(in), txPin(out))
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); //setup LCD
const int inputSensor = A0; //input sensor analog pin 0
const int enterSensor = A1; //enter sensor analog pin 1
const int doorPin = 8; //garage remote pin 8
const int backlightPin = 9; //LCD back light pin 9

unsigned long timeout = 0;
bool stabilized = false;

int doorCodeDecimal = 0; //code in decimal form as it is stored in the Arduino's EEPROM


void setup() {
  lcd.begin(16, 2);
  pinMode(inputSensor,INPUT); //input sensor connected to A0
  pinMode(enterSensor, INPUT); //enter sensor connected to A1
  pinMode(doorPin, OUTPUT); //Setup door pin
  pinMode(backlightPin, OUTPUT); //setup LED backlight pin

  softSerial.begin(9600); //setup serial with Bluetooth
  doorCodeDecimal = EEPROM.read(0); //read password saved in device

  //allow time for device to warm up
  digitalWrite(backlightPin, HIGH);
  lcd.setCursor(0, 0);
  lcd.print("Warming up...");
  delay(30000);
}

void loop() {

  sleepMode(); //sleep when not in use, while allowing interactions through Bluetooth

  //The sensor detects a hand

  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Current:");

  String userInput = "";
  int signalsRead = 0; //how many signals have been read
  bool correctPassword = false;
  while (signalsRead < 8 && !correctPassword) {
  //read signals till code is right or tell the user at the end of 8 readings that the password was wrong

    //wait for enter signal
    lcd.setCursor(0, 0);
    lcd.print("Ready!        ");
    timeout = millis() + 10000;
    while (digitalRead(enterSensor) < 1 && millis() < timeout) { }
    if (millis() >= timeout) { break; }

    //******if there is no signal for 2 secs, the input is 0; 1 otherwise
    lcd.setCursor(0, 0);
    lcd.print("Reading...      ");
    timeout = millis() + 500;
    while (millis() < timeout) {
      if (digitalRead(inputSensor) > 0) {
        userInput += "1";
        break;
      }
    }
    if (userInput.length() == signalsRead) { userInput += "0"; }
    signalsRead++; //record that a new signal is recorded
    //******------------------------------------------------------------

    //display input
    lcd.setCursor(8, 1);
    lcd.print(userInput);

    if (binaryToDecimal(userInput) == doorCodeDecimal) {
      correctPassword = true; //compare user input and actual password. If they equal, terminate and tell user the result
    }

    stabilized = false; //wait for the input sensor to stabilize (read all 0 for 1 second straight)
    lcd.setCursor(0, 0);
    lcd.print("Remove hand...  ");
    while (!stabilized) {
      stabilized = stabilize(inputSensor);
    }
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  if (correctPassword) {
    lcd.print("Correct Password!");
    lcd.setCursor(0, 1);
    lcd.print("Opening Door...");
    digitalWrite(doorPin, HIGH);
    delay(5000); //give garage door time to open
    digitalWrite(doorPin,LOW);
    lcd.setCursor(0, 1);
    lcd.print("Door Opened!   ");
    delay(1000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Have a Good Day!");
    delay(1000);
  } else {
    lcd.print("Wrong Password!");
    lcd.setCursor(0, 1);
    lcd.print("Maybe Try Again!");
    delay(1000);
  }
}


void sleepMode() { //wait for enter signal while reading inputs from Bluetooth terminal
  digitalWrite(backlightPin, HIGH);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Sleeping..."); delay(1000);
  digitalWrite(backlightPin, LOW);
  lcd.clear();
  while (digitalRead(enterSensor) < 1) { //while the user hasn't hit ENTER
    if (softSerial.available()) { //check to see if user wants to change the door code
      String input = softSerial.readString();
      input = input.substring(0, input.length() - 2); //take off the \n from input
      
      if (input.equals(bluetoothPassword)) { //If the input equals the password, allow the user to change the doorCode
        boolean enteredCode=false;
        softSerial.println("\nInput new door code:\n");
        String doorCodeBinary;
        
        while(!enteredCode){ 
          if(softSerial.available()){
             doorCodeBinary= softSerial.readString();
             enteredCode=true;
          }
        }       
        doorCodeBinary = doorCodeBinary.substring(0, doorCodeBinary.length() - 2);
        delay(500);
        doorCodeDecimal = binaryToDecimal(doorCodeBinary);
        EEPROM.write(0, doorCodeDecimal);
        softSerial.println("\nNew door code is: " + doorCodeBinary + "\n");
      }
    }
  }
  digitalWrite(backlightPin, HIGH);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Booting up...");
  stabilized = false; //wait for enter sensor to be stabilized
  while (!stabilized) {
    stabilized = stabilize(enterSensor);
  }
}

bool stabilize(int sensorPin) { //looped until the sensor reads only 0 for 1 second straight
  unsigned long period = millis() + 1000;
  while (millis() < period) {
    if (digitalRead(enterSensor) > 0) {
      return false;
    }
  }
  return true;
}

int binaryToDecimal(String n) { //convert code in Binary into Decimal
  int output = 0;
  int factor = 0;
  while (n.length() != 0) {
    int lastNum = (n.substring(n.length() - 1)).toInt();
    if (lastNum == 1) {
      output += bit(factor);
    }
    factor += 1;
    n = n.substring(0, n.length() - 1);
  }
  return output;
}