- First PIC       :
                          - Will change PIC model PIC16F877A to PIC16F88
                          - The reason is because to reduce the PIC size from 40 pins to 18 pins

- Second PIC :
                          - Already change it from PIC16F877A (16 kb) to PIC18F452 (64 kb)
                          - The reason is because need PIC with more memory storage