SmartLocker/code.ino at main · im45145v/SmartLocker · GitHub

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#include <ESP8266Firebase.h>
#include <ESP8266WiFi.h>
#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#define FINGERPRINT "A1:B8:E0:02:42:47:38:1D:84:1B:3C:HG:1F:6D:B8:GG:13:77:GG:GG"
#define _SSID ""
#define _PASSWORD ""
#define PROJECT_ID "otp-generator-12592"
Firebase firebase(PROJECT_ID, FINGERPRINT);
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};byte rowPins[ROWS] = {D1, D2, D3, D4};
byte colPins[COLS] = {D5, D6, D7, D8};
//columns connected to digital pins of nodemcu
int relayInput = D0;
Keypad keypad= Keypad(makeKeymap(key),rowPins,colPins, ROWS, COLS);
LiquidCrystal_I2C lcd(0x27, 16, 2);
const int len_key = 4;
char otp[len_key];
char master_key[len_key] = otp[len_key];
char attempt_key[len_key];
int z=0;
void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(1000);
  Serial.println();
  Serial.println();
  Serial.print("Connecting to: ");
  Serial.println(_SSID);
  WiFi.begin(_SSID, _PASSWORD);
  // Print the IP address
  Serial.print("Use this URL to connect: ");
  Serial.print("http://");
  Serial.print(WiFi.localIP());
  Serial.println("/");
  digitalWrite(LED_BUILTIN, HIGH);
  pinMode(relayInput, OUTPUT);
  lcd.begin();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Enter OTP: ");
}
void loop(){
  String otp = firebase.getString("/SLOCK");
  Serial.print("Received String: ");
  Serial.println(otp);
  delay(1000);
  char key = keypad.getKey();
    lcd.setCursor(z-1,1);
    lcd.print("*");
    if (key){
      switch(key){
        case '*':
          z=0;
          break;
        case '#':
          delay(100);
          checkKEY();
          break;
        default:
          attempt_key[z]=key;
          z++;
        }
    }
}
void checkKEY(){
  int correct=0;
  int i;
  for (i=0; i<len_key; i++) {
    if (attempt_key[i]==master_key[i]) {
      correct++;
  if (correct==len_key && z==len_key){
    lcd.setCursor(0,1);
    lcd.print("Correct Key");
    digitalWrite(relayInput, HIGH); // turn relay on
    delay(5000);
    digitalWrite(relayInput, LOW); // turn relay off
    z=0;
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Insert Password Now");
   }else{
    lcd.setCursor(0,1);
    lcd.print("Incorrect Key");
    delay(3000);
    z=0;
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Insert Password");
   }
   for (int zz=0; zz<len_key; zz++) {
    attempt_key[zz]=0;
    }
}
//working like a pro