Problem with millis() timing

Projects General Guidance
24

Hello
Here comes a very simple class-less BlinkWithOutDelay example that shows the usage of a struct and user definded datatypes.

struct BWOD {           //  make a data block containing
  byte ledPin;          //  set LED pin
  unsigned long duration;  // set time to blink;
  unsigned long stamp;    // time stamp for timer
};
BWOD bwod {2, 1000, 0};  // initialize data block

void setup() {
  pinMode (LED_BUILTIN, OUTPUT);
  pinMode(bwod.ledPin, OUTPUT);
}
void loop () {
  unsigned long currentTime = millis();
  digitalWrite(LED_BUILTIN, (currentTime / 500) % 2);
  if (currentTime - bwod.stamp >= bwod.duration) {
    bwod.stamp = currentTime;
    digitalWrite(bwod.ledPin, !digitalRead(bwod.ledPin));
  }
}

Have a nice day and enjoy coding in C++.