DIY BOARD WITH MBR0520 TO SWITCH BETWEEN 5 VOLT REGULATE AND THE USB 5V

Using Arduino Project Guidance
1

Good Morning; everyone

I am building a DIY arduino and I want to use the MBR0520 to switch the power between the 5V from the power supply and the USB, I watched the NANO board but it not very clear how to the wiring. Can any one guide in the right direccion with sample circuit.
this board will be use for kids in the Third countries to learn programming

thanks

2

The schematics of the Nano and the UNO are available online. If you need additional help with your board, post your schematics and tell us what problems you have with it.