How to use Arduino UNO 'power on' as a signal?

Projects General Guidance
1

Hi everyone.
is it OK to take UNO's power on as a signal to do some thing, and how please?
Thanks
adam

2

Have the Arduino set an output pin HIGH at startup.

That way you know it booted successfully.

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3

Thanks.
I'd like the UNO itself to use the signal to do some thing at the very begining.

4

Just put code in setup() and it will do things at power on.

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5

Thank you!

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6

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