Although Raspberry Pi has an internal clock, but without internet connection this internal clock resets after every reboot. So to get accurate TIME without internet connection, we need to interface a RTC Module DS1307 to Raspberry Pi. RTC module has button battery for backup so the TIME will not reset. We have also built Alarm Clock using Arduinoand using ATmega32 AVR Microcontroller, check them too.
In this Raspberry Pi Digital Clock, a 16*2 Character LCD is to display Real Time, Alarm time and status of the alarm (ON/OFF). Once the program starts running in Pi, we can disconnect the monitor and can set the alarm with the help of this LCD and five buttons.Read More