We explore how to build a digital clock in this chapter. A digital clock is a type of clock that displays the time digitally. In general, it uses four digits of which two digits are used as the hour display and the rest are used as the minute display. First, we use a 4-digit 7-segment display module. Then, we introduce an OLED graphic display with an I2C interface and describe how to use it to build a digital clock.

You will learn the following topics in this chapter: