This example demonstrates how to use a 4x4 matrix keypad access password from an Arduino. Sketch below required to install password and keypad library, both available at Arduino Playground. Below list the functions of password library:
set(password)
Set the target password equal to password.
is(password)
Is the target password equal to password
append(character)
Append a character to the currently guessed password
reset()
Reset the currently guessed password
evaluate()
Is the guessed password equal to the target password?
Download
- Download and install password library
- Download and install keypad library
How it works
- The secret password is initialize to 1234, you can change this latter by using password.set() command
- The maximum of password length is set to 6, any password input length exceed 6 characters will force to execute checkPassword
- Waiting for input, valid key for password is 0 to 9.
- checkPassword is executed if user press #, it compare input password (guess password) and secret password using password.evaluate()
- If user press the D key, the secret password will reset to 123. Of course you should use your codes to change secret password with keypad.
