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The return value for millis() is of type unsigned long, logic errors may occur if a programmer tries to do arithmetic with smaller data types such as int.Even signed long may encounter errors as its maximum value is half that of its unsigned counterpart.. millis() is incremented (for 16 MHz AVR chips and some others) every 1.024 milliseconds, then incrementing by 2 (rather than 1) every 41 or ...
millis () returns the number of milliseconds passed since the Arduino board started running the current program. Learn the syntax, parameters, return type, example code, notes and warnings, and related functions of millis ().
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The programs presented here overlap with those in that thread but I have put my own spin on using millis() and described the programs in my own way. Between the two you should have a clearer understanding of how to use millis() for non blocking timing. In this thread I will try to explain the principles of using millis() for timing and apply it ...
Learn how to use the millis () function to get the number of milliseconds passed since the Arduino program started. See examples, syntax, return values, and rollover issues.
Learn how to use the Arduino millis() function to create a timer-based system for various events without blocking the CPU. See examples, code, and explanations of the millis() function, its advantages, limitations, and overflow issue.
Fortunately, we can use millis() instead of delay() to solve all the above issues. We will learn how to use millis() instead of a single delay() and multiple delay(). We can also apply it for multitasking.
TIP: If you want to go beyond 50 days, add another variable that acts as extra bits in front of the unsigned long e.g. an unsigned char would extend time by 256 * 50 days. Increment it every time the millis() time wraps around. The downside is that you would need to include that 8 bit quantity in all time calculations so you would need to make your own "greater than" operation etc.
Learn how to use the millis () function to measure the elapsed time since the Arduino program started. See the syntax, parameters, return value, example code and notes for this function.