when you then try to do something like unsigned int time = millis () 1000, you try to store that in a 16 bit unsigned integer unsigned int. millis () returns a unsigned long, which is a 32 bit unsigned integer on the arduino. Understand what is the overflow problem with millis() and micros(), how to solve it using a specific code structure, and how to still be able to get the exac. The Riddle Underlying The Arduino Millis Overflow Wraparound Conundrum Bit138 a 16 bit integer can never hold a 32 bit value. not a great analogy to a variable overflow in c c, but you get the idea…. here we discuss how to use millis () and micros () and their major advantages compared to delay (). 3 comments one of our most popular blog posts right now this is called arduino tutorial: using millis () instead of delay (). the calculated time difference however will remain correct as long as loop interval is less than half the overflow period (32 seconds or so). In the code snippet below, millis () gets truncated to a 16 bit unsigned quantity which will overflow every 65'ish seconds. ![]() The Riddle Underlying The Arduino Millis Overflow Wraparound Conundrum Eeweb
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