Another Interrupt Example: Arduino Course 9.4

In this lesson, the instructor reviews the previous session's project involving an LED and button. The focus is on using flags in interrupt service routines (ISRs) to manage tasks that are not time-sensitive. The lesson also covers implementing a counter variable within an ISR to count button presses. The instructor explains the importance of using volatile qualifiers for variables in ISRs and demonstrates how to print messages to the serial monitor based on events. The session concludes with a review of the concepts and encourages students to engage with challenges.

What is the significance of the volatile qualifier in the context of the flag variable?

How does the code ensure that the flag variable is reset after being used?

What are the potential issues with using serial print inside an interrupt service routine?

In what scenarios would you want to use a flag variable instead of executing code immediately in an interrupt service routine?