Powering Nano from rail?

Projects General Guidance
1

I have a stand-alone set up using a Nano, a RTC and relay board. While testing and developing I have been powering all three parts via the nano USB. But, when it's in normal use there will be no computer to connect to as it will all be soldered to veroboard.

I have a 5v wall-wart with no connector on the end of the output wires and wondering if I can simply connect the power to the Nano via the +5v pin near the last Analog pin. I know I can connect the wall-wart power to the RTC and relay board, but not sure if it is OK to feed power into that 5v pin on the Nano.

Thanks

2

Yes. As long as that's a regulated power supply you can power it directly from 5V. (Most wall-wart power supplies are regulated, but some "cheap" unregulated 5V power supplies can put-out 7V or more depending on load current.)

3

I thought Nano has a 5V regulator on its under side. Connect wall wart to vin (need 7V or higher wall wart).

4

liudr:
I thought Nano has a 5V regulator on its under side. Connect wall wart to vin (need 7V or higher wall wart).

Thanks, I had looked for, but didn't see the Vin. But then after you mentioned it, I looked again with a magnifier and it is the first pin on the left side. DUH!! :slight_smile:

I had seen the rather large regulator on the underside and figured there must be some way of doing it and thought that connecting to the +5v pin was the way.

I am old I miss stuff sometimes. Thanks.