The sketch starts by including libraries (if required) and defining global variables and objects. We can visualize an Arduino sketch with a simple flowchart, something like this: Let’s look at how all of this fits into your Arduino sketch. When an interrupt event occurs, the microcontroller runs some code that you have placed in an “Interrupt Service Routine” or ISR function. We will discuss these in detail in a bit, but for now, let’s just say that they all work in basically the same way. Timer Interrupts – Internal timer-generated interrupts, manipulated in software. ![]()
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