CHAPTER ONE 1.0 INTRODUCTION
This project is a design and construction of a digital clock with calendar. The core component is the microcontroller PIC16f877. This device employs sequential circuit components. It consists of LED, seven segment display, transistor, voltage regulator, resistors and capacitor.
FIG.1.0 THE PIC16F877 INTERNAL STRUCTURE
1.1 BRIEF DISCUSSION ON CLOCK
A clock is an instrument to indicate, keep, and coordinate time. Today a clock “refers to any device for measuring and displaying the time”. The clock is one of the oldest human inventions, meeting the need to consistently measure interval of time shorter than the natural unit, the day, the month and the year. Devices operating on several physical processes have been used over the millennia.
A digital clock is a type of clock that displays the time digitally (i.e. In numerals or other symbols), as opposed to an analog clock, where the time is indicated by the positions of rotating hands.