Arduino Keypad Lock with Password Changing #include <Keypad.h> #include <Password.h>
String newPasswordString; //hold the new password char newPassword[6]; //charater string of newPasswordString
//initialize password to 1234 //you can use password.set(newPassword) to overwrite it Password password = Password( "1234" ); Password passwordset = Password( "" ); boolean change = false;// Are we changing the code? byte maxPasswordLength = 4; // Self-explanatory byte currentPasswordLength = 0;//^ Same as above ^ const byte ROWS = 4; // Four rows const byte COLS = 4; // Four columns
//Define the keymap char keys[ROWS][COLS] = { {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'} };// Set yours, they can often be different
//// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins. byte rowPins[ROWS] = {6,7,8,9}; //connect to row pinouts
// Connect keypad COL0, COL1, COL2 and COL3 to these Arduino pins. byte colPins[COLS] = {2,3,4,5}; //connect to column pinouts
// Create the Keypad Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
void setup(){ Serial.begin(9600);// Set up Serial }
void loop(){ if(change=false){// If we aren't changing password char key = keypad.getKey();// Get the key if (key != NO_KEY){// If there is a key being pressed delay(60); // Wait a bit switch (key){// Evaluate the key pressed case '#': checkPassword(); break; case '': change=true; break; default: processNumberKey(key); } } } else {// Same as above, but is changing password instead of // entering the code char key = keypad.getKey(); if (key != NO_KEY){ delay(60); switch (key){ case '#': / nothing / break; case '': changePassword(); change=false; break; default: processChange(key); } } } }
void processChange(char key) { Serial.print(key); currentPasswordLength++; passwordset.append(key); if (currentPasswordLength == maxPasswordLength) { password.set(passwordset);// Set the passcode } }
void processNumberKey(char key) { Serial.print(key); currentPasswordLength++; password.append(key); if (currentPasswordLength == maxPasswordLength) { checkPassword();// Validate the entered code } }
void checkPassword() {// Validation if (password.evaluate()){ Serial.println(" OK."); } else { Serial.println(" Wrong password!"); } resetPassword(); }
void resetPassword() {// Reset password. Duh :) password.reset(); currentPasswordLength = 0; }
void changePassword() {// Change the password newPasswordString = "123"; newPasswordString.toCharArray(newPassword, newPasswordString.length()+1); //convert string to char array password.set(newPassword); resetPassword(); Serial.print("Password changed to "); Serial.println(newPasswordString); }