![]() ![]() The timelines below illustrate three scenarios that occur in the execution of the program above. In the example below, a single function called TaskA() is repeatedly executed every 50 milliseconds (ms). Recap: Blink-Without-Delay Timing Methodįirst, let’s review the essential elements of the blink-without-delay method using the millis() function. Finally, it describes a method to structure and modularize your code in a way that allows you to implement multiple concurrently-executing “tasks” while actually improving code readability.Īnd as an added bonus, you’ll be able to impress your friends by confidently explaining the difference between preemptive multitasking and cooperative multitasking. Next, it describes how to use this new method to address the variety of delay/timing scenarios that you’re likely to encounter. It starts by introducing a variant of the blink-without-delay method that is both easier to understand and simpler to implement. ![]() The goal of this article is to help you advance to that next level of sophistication. But…the example used in the tutorial is pretty simplistic, and doesn’t provide any guidance on how to use this method in more complex situations involving multiple tasks with overlapping and non-aligned timing requirements. So after a little research you likely found the Blink Without Delay tutorial, which opened up a new world of possibilities by recommending use of the millis() function to implement non-blocking delays. ![]() That makes it impossible to perform any other functions (except interrupts) concurrently with the delay. But you soon learned that the delay() function is blocking, meaning that the processor doesn’t advance to the next instruction until the specified delay time has expired. On your first simple projects, you probably got away with using one or more calls to the Arduino delay() function to implement fixed or variable delays within your main loop(). If you’ve been building projects with Arduino-compatible microcontrollers for more than a few months, you’ve probably faced the challenge of orchestrating the timing of the processing functions for multiple switches, sensors, displays, LEDs, motors, etc. ![]()
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