The full tutorial for this video (with images and step-by-step tips) https://core-electronics.com.au/tutorials/arduino-workshop-for-beginners.html In this section, we'll look at how to use interrupts. You may have heard of them before, and they're a great way to increase your program's efficiency when dealing with hardware inputs. Core Electronics is your home in Australia for: Arduino https://core-electronics.com.au/arduino.html