-I used OSHPark to fabricate the PC boards. At the time, the cost for 3 copies was $35.25. The project link on OSHPark can be found here: https://oshpark.com/shared_projects/GuvT1WRv

-All components are through-hole.

-The switch has a basic debounce circuit and it is active LOW.

-The 1x18 Pin Header for the bottom row of pins on the Arduino can be left off. They are not connected.

-The switch SW1, R1, R4, C3 can be left off if you don't need a switch.

-The LED D1, R2 can be left off if you don't need an indicator light.

-DuPont jumper wires (female-to-female) can be used to easily jump pin headers.