In this tutorial, we explore the concept of interrupts and learn how to use them through two practical examples, complete with code and demonstrations, to interrupt a delay effectively. In the second part of the lesson, we delve into the use of a Light Dependent Resistor (LDR) to measure light intensity and differentiate between day and night. Using a Kaiweets KM601 multimeter, we test the LDR and, with the first code example, determine the darkness and daylight values using an Arduino. In the second example, we implement an action to turn a buzzer ON during either the night or the day based on the detected light levels.