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- #include <Keypad.h>
- const int ROW_NUM = 4; // four rows
- const int COLUMN_NUM = 4; // four columns
- char keys[ROW_NUM][COLUMN_NUM] = {
- { '1', '2', '3', 'A' },
- { '4', '5', '6', 'B' },
- { '7', '8', '9', 'C' },
- { '*', '0', '#', 'D' }
- };
- byte pin_rows[ROW_NUM] = { 9, 8, 7, 6 }; //connect to the row pinouts of the keypad
- byte pin_column[COLUMN_NUM] = { 5, 4, 3, 2 }; //connect to the column pinouts of the keypad
- Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);
- const String password_1 = "1234"; // change your password here
- const String password_2 = "2222"; // change your password here
- const String password_3 = "3333"; // change your password here
- String input_password;
- int RELAY = A2;
- int sendData = 10;
- void setup() {
- Serial.begin(115200);
- input_password.reserve(32); // maximum input characters is 33, change if needed
- pinMode(RELAY, OUTPUT);
- pinMode(sendData, OUTPUT);
- digitalWrite(sendData,LOW);
- }
- void loop() {
- char key = keypad.getKey();
- if (key) {
- Serial.println(key);
- if (key == '*') {
- input_password = ""; // reset the input password
- } else if (key == '#') {
- if (input_password == password_1 || input_password == password_2 || input_password == password_3) {
- Serial.println("The password is correct, unlocking the door in 20 seconds");
- digitalWrite(sendData,HIGH);
- Open();
- delay(5000);
- digitalWrite(sendData,LOW);
- Closee();
- } else {
- Serial.println("The password is incorrect, try again");
- digitalWrite(sendData,LOW);
- }
- input_password = ""; // reset the input password
- } else {
- input_password += key; // append new character to input password string
- }
- }
- }
- void Open() {
- digitalWrite(RELAY, HIGH);
- }
- void Closee() {
- digitalWrite(RELAY, LOW);
- }
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