Found an awesome keypad for my application here.
I have added the keypad to the sample web app successfully. Now that i need to use the keypad to Log in to the device by sending the log in information to the Raspberry Pi webserver and the server will send to the device through the serial port.
i find it hard to apply what i’ve just learnt. the examples and tutorials are too limited. or my understanding and capability are too limited. Too dependant. 😦