Trying to Blink LED1 for 100 times at the same time blink LED2 and LED3 complimentarily for 60 times

[LarryD]

@DaveX

Why is periodStartTime = currentMillis; preferable to periodStartTime += TimePeriod; ?

As long as there is no chance of what is discussed here, += TimePeriod can be used.

Blink Without Delay problem. Warning.

Warning to new people. I just wanted to point out a potential (major) problem with the BWD (Blink Without Delay) technique. There are two (four, see post #4) ways that the BWD timing variable can updated: Method one updates the timing variable by adding the delay time to the timing variable itself. There is an argument that this will prevent slippage in timing. millisOne = millisOne + delayTime; Method two updates the timing variable by setting it equal to the current value of millis()…

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Note:
If it is important to your sketch, periodStartTime = currentMillis; keeps subsequent TIMERs all referenced to the same time.