DIGITAL CLOCK AND CALENDER MANAGEMENT SYSTEM PROJECT REPORT

The design and operational principle of the digital calendar and digital clock is the subject of this thesis. The system as realized in this book is made up of six units.The power supply unit supplies the required regulated voltage to the appropriate connections of the overall circuit. The micro controller controls the general operation of the circuit; all the other units are interfaced to it. The input unit is activated by pressing the keypad (buttons) unit to call up the subroutine program that controls the set date, month, year and time with alarm instructions. The decoder with the aid of the micro controller executes the instruction codes, which are transmitted to the light emitting diode that corresponds to the actual day that is to display. The display unit consist of a twelve seven segment display in which their common anode is driven by a NPN switching transistor; displaying digits in a multiplex mode.