1

I want to create a 30 minutes delay in my program (Arduino).

which is better millis() or timer for this purpose?

please give me an example to clarify my doubt ...

Thanks.

3

It depends on your need:

1. No other activities / main power

If during those 30 minutes (I guess), the MCU does not have to do anything else (except maybe handling some short interrupts), than you can use a delay. You can use this if your power source is an adapter, but you waste a lot.

  • Advantage: Easy to program
  • Disadvantage: Power will continue to be used.

2. No other activities / battery

If you have the same conditions as above, but using a battery, than as Juraj mention, use the sleep functionality of the Arduino. You need an (external) real time clock or other circuitry to activate the wakeup signal after 30 minutes.

  • Advantage: Very less power used during the 30 minute delay
  • Disadvantage: Slightly more programming

3. Other activities

If you want to do now (or later) other code to be executed during the 30 minute wait, use millis(). For example, when you want to extend your project using other libraries that needs a faster than 30 minute response.

  • Advantage: You can do other tasks meanwhile
  • Disadvantage: More power usage, slightly more programming
  • 2
    2) esp8266 has built-in RTC with deep sleep wake-up option – Juraj Jul 19 '19 at 12:31
  • 1
    3) for example blink a LED to show that it is alive – Juraj Jul 19 '19 at 12:32
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    1) interrupts to keep the WiFi connected – Juraj Jul 19 '19 at 12:33
  • @Juraj thanks for the extra comments .. offtopic:. btw congratulations with your 10K reputation. I removed my other answer so you don't need to downvote it anymore). – Michel Keijzers Jul 19 '19 at 12:39

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