one usb to the Pi and one to a 5V psu
used these 2 connectors
https://www.aliexpress.com/item/4000374022140.html?spm=a2g0o.cart.0.0.23b138daFOEDf2&mp=1
https://www.aliexpress.com/item/33042618598.html?spm=a2g0o.cart.0.0.b2bc38daBTc4TK&mp=1
The author marked this model as their own original creation.