Microcontroller Based Digital Clock
Islam, Md. Tamzidul
Wahid, Md. Ferdous
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A digital clock is a type of clock that displays the time digitally, i.e. in ciphers, as opposed to an analog clock, where the time is displayed by hands. Usually, digital clocks are associated with electronic drives. Digital clocks typically use the 50 or 60 hertz oscillator of AC power or crystal oscillator as in a quartz clock to keep time. Internationally digital clocks display the hours of the day in24 hour format but in our country a more commonly used hour sequence is 12 hour format (with some indication of AM or PM). In this project to represent the time, Seven-segment Display has been used for each of four digit which shows hours and minutes and in order to represent seconds LED’s are used for each and every seconds . Moreover, as they run on electricity, most digital clocks must be reset every time they are moved or the power is cut off. To reduce the problem, here a battery backup has been used to maintain the time during power outages. In this project we have used RTC (Real Time Clock). Two switches have been used, one for entering the time and second is for time increment. This digital clock is inexpensive device that makes product designs more popular. This project uses regulated 5V & 1A power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify AC output of secondary of 230/6V step down transformer.