![]() Again, there's the alternative elapsedMicros for higher precision, from the same library. This code showing only One instancw of time so I cant measure time interval.I am new in Arduino and try to make ventilator. Looking into the source code of elapsedMillis reveals that it indeed uses millis() internally to compare two points in time, so it suffers from this effect as well. I want to measure time interval between two input pulses on pin 2 of Arduino UNO by using timer interrupt method and I have written this code but its not working properly. ![]() Use micros() if higher precision is needed. It now supports 16 ISR-based timers, while consuming only 1 Hardware Timer. That means that, when calculating the difference between two results from millis(), you can be off by anything between almost zero and almost one millisecond. TimerInterrupt Device Control This library enables you to use Interrupt from Hardware Timers on an Arduino, Adafruit or Sparkfun AVR board, such as Nano, UNO, Mega, Leonardo, YUN, Teensy, Feather32u4, Feather328P, Pro Micro, etc. It's possible that the "current" millisecond just started, or that it will end right after that function call. When millis() is called, the implementation returns some value, but you don't know how old that actually is. Millis() usually relies on a hardware timer that runs at a speed that's much higher than 1 kHz. missing events that happen during the delay and are not handled by an interrupt handler, for example polled button presses: A button might be pressed for 100 ms, but this might be shadowed by a delay(500).unexpected delays: when delay() is called in subroutines that are not obviously called, for example in libraries you include.Wasting CPU time: More complex sketches might need the CPU for something else while waiting for an LED blinking period to end.When things get more complex, using these functions can have some drawbacks. For very simple sketches, writing blocking code using delay() and delayMicroseconds() can be appropriate.
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