LCD interface

Hi Nishanth,

It depends on the actual LCD and Keypad, but I'll try to give you a few pointers:

LCD - LCDs typically interface through a serial interface like SPI or through a higher speed parallel interface.  Serial interfaces are typically easily to wire up and program, but their bandwidth is lower than a parallel interface which mean you cannot update the display as quickly.  If you already have an LCD picked out, start reading the documentation to figure out how to wire everything and send it commands.

Keypad - Most keypads are just a matrix of switches that can be scanned using GPIO pins, although some have a built in controller that can be interfaced with using a serial peripheral.  Try searching the web for keyboard scanning and you should find some good information for how to accomplish this.

Trey