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Lesson 105-3: How to Build an LED Seven-Segment Clock Using a DS1307 RTC with Arduino

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 4: LED Seven-Segment Clock. This code is to build an actual digital clock using the DS1307. We used an HT16K33 4-digit seven-segment display to display the time.