However if you wait too long then you miss the overflow update, and then the result returned will go down (i.e you will get 253, 254, 255, 0, 1, 2, 3 etc. With this, I expect to see durations in increments of 10 milliseconds, but I am getting values in between. If your answer is using the delay function, well, you’re kind of right. I am sampling the voltage every 10 milliseconds by using delay(10) and I am getting duration by using millis() to obtain the time at voltage changes. Millis() versus Delay() So you want something to occur at a set interval and you’re looking for a solution. Even though both functions will work with milliseconds and could be used to control. Can be handy for testing purposes, but you do not need this to handle the millis () rollover problem. Delay vs Millis (function) The first difference you can see is that millis () has no parameter but returns the amount of time that has passed while the delay () will require the number of milliseconds we want to pause the program but will not return anything. The liked answer also gives the trick for resetting millis (). However, this is not a problem: as long as you compare durations instead of timestamps you can forget about the overflows.

Thus, even inside an ISR, you can rely on micros() updating. I am using the Arduino Uno to observe the duration of a voltage change. millis () and micros () overflow periodically. Then, why not our ArduinoOkay, without further delay, let's go to our today's topic, that is Delay versus Millis com. It then adds in the Timer 0 overflow count, which is updated by a timer overflow interrupt (multiplied by 256). delay pauses a sketch for the number of milliseconds specified as a parameter (there are. It always reads the current hardware timer (possibly TCNT0) which is constantly being updated by the hardware (in fact, every 4 µs because of the prescaler of 64). The Arduino delay function is used in many sketches, as we have seen. The other answers are very good, but I want to elaborate on how micros() works.

Arduino millis vs delay