Interesting Relay Circuit build

Interesting build.  My 2 cents, you can get these pretty cheap on Ebay pre-made, I think I would go that route for now.  But if you are even cheaper than that, this maybe the way to go, or if you need to make a custom sized board.

https://www.instructables.com/id/How-to-Make-Relay-Circuit-Board-for-Arduino-1/

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