How to make a PIN/Password Keypad with Arduino IR Remote

#include <IRremote.hpp> // Include IR Remote library const int receiverPin = 2; // Set the IR sensor pin String currentKeys = ""; // String holding currently pressed keys const String password = "#1249"; // Your password int failureCount = 0; // Failure count integer void setup() { Serial.begin(9600); // Serial Monitor begin IrReceiver.begin(receiverPin, ENABLE_LED_FEEDBACK); // Start receiving data from the IR sensor } void loop() { if (failureCount >= 5) { // if the failure count is 5 or more Serial.println("5 failed counts! locking."); // print message to serial IrReceiver.stop(); // stop the sensor delay(5000); // sleep for 5 seconds failureCount = 0; // reset the failureCount currentKeys = ""; // reset pressed keys IrReceiver.begin(receiverPin, ENABLE_LED_FEEDBACK); // start the sensor again Serial.println("Unlocked."); // print message return; // clear any leftover data } if (IrReceiver.decode()) { // receive data from the sensor long int decCode = IrReceiver.decodedIRData.decodedRawData; // decode the received data Serial.println(decCode, HEX); // print data char keyPressed = 'X'; // char holding pressed keys. X for default if (decCode == 0xBA45FF00) keyPressed = '1'; // decoded code for 1 key else if (decCode == 0xB946FF00) keyPressed = '2'; // these values are different for you, you need to first upload the code, else if (decCode == 0xB847FF00) keyPressed = '3'; // note all codes for buttons, else if (decCode == 0xBB44FF00) keyPressed = '4'; // and replace these values with yours. else if (decCode == 0xBF40FF00) keyPressed = '5'; // all data must start with 0x, else if (decCode == 0xBC43FF00) keyPressed = '6'; // for example if you receive EA15FF0, you need to put 0xEA15FF0 to the if-else block. else if (decCode == 0xF807FF00) keyPressed = '7'; // try to directly aim the remote to the IR sensor for the correct code. else if (decCode == 0xEA15FF00) keyPressed = '8'; else if (decCode == 0xF609FF00) keyPressed = '9'; else if (decCode == 0xE619FF00) keyPressed = '0'; else if (decCode == 0xE916FF00) keyPressed = '*'; else if (decCode == 0xF20DFF00) keyPressed = '#'; else if (decCode == 0xF708FF00) {currentKeys = ""; Serial.println("Clearing pressed keys");} // I used one of my keys for cleaning all pressed keys else if (decCode == 0xA55AFF00) { // I used one of my keys for clearing the last entered character if (currentKeys.length() > 0) { // if the current clicked keys are bigger than zero (this is required to prevent problems) currentKeys.remove(currentKeys.length() - 1); // remove the last character entered from the clicked keys } Serial.print("Current entry: "); Serial.println(currentKeys); // print clicked keys } if (keyPressed != 'X') { // if we got a known button click (not X) currentKeys += keyPressed; // add that clicked key to the currentKeys string Serial.print("Current entry: "); Serial.println(currentKeys); // print clicked keys } if (currentKeys.length() >= 10) { // to block attacks, I set the limit of the password to 10. Serial.println("Pin too long! Reseting."); // print too long message currentKeys = ""; // reset clicked keys failureCount++; // increase failure count by 1 Serial.print("Failed attempts: "); Serial.println(failureCount); // print failure counts } if (decCode == 0xE31CFF00) { // if the OK button is pressed (the button to confirm/enter the password) if (currentKeys == password) { // if the current entered keys match our hardcoded password Serial.println("ACCESS GRANTED"); // grant access! failureCount = 0; // reset failure count // here you can do anything like blinking a led, a buzzer, using a relay etc. } else { // if not equal to password Serial.println("ACCESS DENIED"); // deny access! failureCount++; // increase failure count Serial.print("Failed attempts: "); Serial.println(failureCount); // print failure count } currentKeys = ""; // reset clicked keys } IrReceiver.resume(); // continue receiving data from the IR sensor } }