Circuit Digital Clock DS1307
In this article you will learn how to make a digital clock using Arduino and the DS1307 RTC
IC. What is DS1307 IC actually? Well, it is a Real Time Clock (RTC) IC that is simple to use, low cost and easy available.
The IC basically is able to count the date and time accurately and it will continue its counting if the backup battery – coin cell battery is there although the mainsupply to the IC is cut off.
So, it is not necessary to use coin cell battery as the backup battery. You can use any type of battery with volatge range from 2.0V to 3.5V as shown above. However, we choose to use coin cell battery as it is small and easy to carry/install.
Two 10k pull up resistor s are at the SDA and SCL pins. This is due to the reason that DS1307 communicates through I2C interface.