Alarm clock Using Atmega-328 and RTC

Hi everyone! This is my first instructable! After reading hundreds of instructables, I decided to make one myself.
Clock is one of the most essential house hold things. There are various types of clocks like good old Pendulum clocks, Analog clocks and the now trending modern Digital clocks.
Digital clocks has many advantages over the analog clocks like the Accuracy in time, easy reading of time when compared to analog, visibility even in darkness and so on…
Here a Alarm clock is presented which is built using simple Atmega-328 microcontroller and DS-1307 RTC which is a time keeper which keeps the time even when there is a power failure.

Features:
– Remember the time after a power failure.
– Sound an alarm at a predetermined time, without having to be “armed” each day.
The program is written to ring the alarm each day at 5.00 am (this can easily be changed in the code). Once the alarm is cancelled by pressing the cancel button it re-arms itself an hour later, ready for tomorrow.
– Keep ringing for 5 minutes until you get out of bed to cancel it.
The program rings for 5 minutes (the time is configurable) to make sure you wake up. By physically locating the clock some distance from the bed you ensure that you have to get out of bed to shut it up.
– Flash a LED to help locate the “cancel” button in the dark.
The LED next to the button flashes brightly to help you find it in your sleepy state.
– Be able to cancel the alarm function during holidays.
A slider switch lets you disable the alarm during holidays.
– Handle Daylight Saving Time easily.
Another slider switch adds an hour to the time as read from the clock chip. Thus you simply slide it across at the start of Daylight Saving Time, and back again at the end.
– Dim the display at night.
Between the hours of 9 pm and 6 am the digits on the display are dimmed (by reducing the duty cycle of the pulse-width-modulation). This makes them unobtrusive when you are trying to sleep.
-Only sound on Monday to Friday (school/work days).
The code can determine the day of the week from the clock chip, and thus only sound the alarm on weekdays. This saves the problem of turning the alarm off on the weekend, and forgetting to turn it back on on Sunday night.