i need anyone who can write me a code to use 3*4 keypad with lcd using a pic16f84 or pic16f628. the code should be able to accept new code or code to be change and determine whether is right or wrong.

 

If you think someone is just going to write you code, I feel you may be a sorely disappointed.

Have a look here for a guide to getting help on the forums. The more you bring to the discussion the better your chances of success.

Dave