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  • I cannot use delay, because it's blocking, and this won't go with the rest of the (bigger) program. Could you please expand a bit more on your idea of putting a fixed variable in setup()? My while loops are trying to determine the period of time to stay inside. Commented Oct 5, 2017 at 17:27
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    @Tahseen: You wrote “I cannot use delay” and yet you are using it in flash(). So what’s the deal? Commented Oct 5, 2017 at 18:20
  • Exactly... I didn't understand what you mean by "it's blocking", what's the reason you can't use it? Commented Oct 5, 2017 at 18:25
  • I used it in flash() to have the effect of lights turning on and off. But if I use it in the actual while loop, other things that I hope to incorporate in the future cannot work. For example, I want to use a radio that wakes up for 250 ms, sees if it has any command, then goes to sleep for 3 secs. If it received a command in that 250 ms interval, the arduino will flash the lights for 9 secs Commented Oct 5, 2017 at 19:04