Because i want to play with a Nes Emulator , but a classic gamepad wasn't cool ,so i made this nes gamepad was work on a classic usb port.
I use the same tools that i use in my first instructables (https://www.instructables.com/id/NES-Cartridge-External-HDD/),a good condition nes gamepad and a cheaper usb gamepad (like the picture).
and before to start , i use acetone to clean the contact of the nes gamepad....
because the two circuits board don't fit in the nes gamepad ,
i desolder the capacitor to put it in the corner of the nes gamepad.
and i follow all the connection between the contacts and the hole of the microchip original of the nes gamepad.
and , now i connect wire by wire the connections of the nes pad with the connection of the usb gamepad
(In fact , no matter what connections you made , because on the nes emulator, you can configure as like you want ! but in my case , i tried do make sense , ie the up on the nes with the up of the usb gamepad .....)
and i have a Nes gamepad USB !!!
For the bottom , i use à fake screw to blink the hole was missing ....
Thanks for your attention !!
Have fun !