In this lesson, we have seven projects in one. We learn how to use the DS1307 Real-Time Clock (RTC) module to build a clock using Arduino.

This is project 7: LCD Clock using the DS1307 RTC module with alarm. We learn how to display a full calendar and clock on an LCD1602 or LCD2004 LCD display and display alarms on the LCD. We use an LCD screen with the I2C module, which allows us to use only four wires.