# Can Serial Monitor Be Used to Monitor Uno Countdown?

**URL:** <https://forum.arduino.cc/t/can-serial-monitor-be-used-to-monitor-uno-countdown/1205896>\
**Category:** General Guidance\
**Created:** [January 1, 2024, 4:35pm UTC](https://forum.arduino.cc/t/can-serial-monitor-be-used-to-monitor-uno-countdown/1205896 "2024-01-01T16:35:47Z")\
**Posts on this page:** 1\
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**Author:** ![J-M-L](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/j-m-l/32/766245_2.png) [@J-M-L](https://forum.arduino.cc/u/J-M-L)\
**Post date:** [January 1, 2024, 10:30pm UTC](https://forum.arduino.cc/t/can-serial-monitor-be-used-to-monitor-uno-countdown/1205896/9 "2024-01-01T22:30:18Z")

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Delay is blocking the arduino. You can’t do anything whilst it’s blocked.

Use millis ➜ For extra information and examples look at

- [Using millis() for timing. A beginners guide](https://forum.arduino.cc/index.php?topic=503368.0)
- [Several things at the same time](https://forum.arduino.cc/index.php?topic=223286.0)
- [Flashing multiple LEDs at the same time](https://forum.arduino.cc/t/flashing-multiple-leds-at-the-same-time/1065564)

You did not answer on why you need an arduino for this? You can even find stuff on line like [Countdown Timer to Any Date](https://www.timeanddate.com/countdown/create)

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