A. Microcontroller
PIC is a family of Harvard architecture microcontrollers
made by Microchip Technology. The name PIC initially
referred to "Programmable Interface Controller”, but shortly
thereafter was renamed "Programmable Intelligent Computer".
During the initial development, PIC 18F873 was used as
microcontroller, but due to its I/O ports limitation, we change
to PIC 16F877 which gives many ports compared to PIC
18F873. This microprocessor as shown in Figure 2 has high
computational performance at an economical price with the
addition of high-endurance, Enhanced Flash program memory.
All of these features make these microcontrollers a logical
choice for many high-performances, power sensitive
application