#include <LiquidCrystal.h>
#include <Keypad.h>
#include <Ultrasonic.h>
//const int trigPin = 6; 
//const int echoPin = A4;
Ultrasonic ultrasonic=(A4,6);

const int ledPin = 3;
LiquidCrystal lcd(7, 8, 9, 10, 11, 12); 
const byte ROWS = 4;
const byte COLS = 4;
byte rowPins[ROWS] = {A0, A1, A2, A3}; 
byte colPins[COLS] = {2, 4, 5, 13}; 
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

const String correctPassword = "1234";  
String inputPassword = "";


void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.print("System Ready");
  delay(2000);
  lcd.clear();
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW); 
  //pinMode(trigPin, OUTPUT);
  //pinMode(echoPin, INPUT);



}
/*float measureDistance() {
  float distance=
  return distance;
}*/

void loop() {
  float distance = ultrasonic.read();
  // Afficher la distance
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println("cm");
  delay(500); 
   lcd.setCursor(0, 0);
   if (distance <= 50 ) {
     lcd.clear();
     lcd.print("Enter Code:");

    while (inputPassword.length() <= 4) {
      char key = keypad.getKey();
      if (key) {
        if (key == '*') {
          
          inputPassword = "";
          lcd.clear();
          lcd.print("Cleared");
          delay(1000);
          lcd.clear();
          lcd.print("Enter Code:");
        } else if (key == '#') {
          
          lcd.clear();
          if (inputPassword == correctPassword) {
            lcd.print("Code Correct !");
            digitalWrite(ledPin, HIGH); 
            delay(3000); 
            digitalWrite(ledPin, LOW); 
            lcd.clear();
          } else {
            lcd.print("Code Incorrect");
            digitalWrite(ledPin, LOW); 
            delay(2000);
            lcd.clear();
            lcd.print("Enter Code:");
          }
          inputPassword = ""; 
        } else if (isDigit(key) && inputPassword.length() < 4) {
          inputPassword += key;
          lcd.print("*");  
          delay(300); 
        }
      }
    }
  }else {lcd.print("trop loin");}

  







}