NOP can be used up. or a loop can be inserted in between ON & OFF time

You can do something like this:

void loop(){

// Define the variables

unsigned long onTime 100000; // Defines the time that the led must be on

unsigned long offTime 500000; // Defines the time that the led must be off

unsigned long startTime, elapsedTime;

// Initialize the elapsedTime variable

elapsedTime = 0;

// Get the current elapsed time since power on

startTime = millis();

// Now we turn on the led

pinMode(ledPin, OUTPUT);

digitalWrite(ledPin, HIGH);

while (elapsedTime

Thank you Diego and Jain!

you also can switch the LED according to certain Time point using an RTC. For some applications this is the most efficient way.

Perhaps this is also an opportunity for your Projekt